https://club8090.co.uk/w/index.php?action=history&feed=atom&title=VW_Electrics_Dash_Fan_Control_UpgradeVW Electrics Dash Fan Control Upgrade - Revision history2026-05-17T16:11:50ZRevision history for this page on the wikiMediaWiki 1.44.2https://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13374&oldid=prevCovKid at 10:11, 24 December 20172017-12-24T10:11:31Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Identifying blower cables'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Identifying blower cables'''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>There are a couple of things you need to bear in mind when connecting the PWM controller. Firstly, on a 3-speed blower, there are <del style="font-weight: bold; text-decoration: none;">three </del>wires that <del style="font-weight: bold; text-decoration: none;">come out </del>of the blower unit (see photo) <del style="font-weight: bold; text-decoration: none;">plus an earth</del>. If you cut these wires at the blower switch and remove switch completely, you can then pull them up via the ashtray and follow the cable bundle further down to the blower box and locate the brown earth wire - you'll need this. I managed fine peering down there with a torch.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>There are a couple of things you need to bear in mind when connecting the PWM controller. Firstly, on a 3-speed blower, there are <ins style="font-weight: bold; text-decoration: none;">are five </ins>wires that <ins style="font-weight: bold; text-decoration: none;">form part </ins>of the blower <ins style="font-weight: bold; text-decoration: none;">circuit, 12v power, brown earth, and three wires at the switch </ins>unit (see photo) <ins style="font-weight: bold; text-decoration: none;">that went to the resistors</ins>. If you cut these wires at the blower switch and remove switch completely, you can then pull them up via the ashtray and follow the cable bundle further down to the blower box and locate the <ins style="font-weight: bold; text-decoration: none;">elusive </ins>brown earth wire - you'll need this. I managed fine peering down there with a torch.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>You'll need to disconnect the battery, remove the ashtray and the blower facia by pulling off the lever knobs and carefully prising off the facia. This will expose the speed control which can be unclipped and the three wires behind, cut off. Theres also a red/black wire which is the power to the fan.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>You'll need to disconnect the battery, remove the ashtray and the blower facia by pulling off the lever knobs and carefully prising off the facia. This will expose the speed control which can be unclipped and the three wires behind, cut off. Theres also a red/black wire which is the power to the fan.</div></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13373&oldid=prevCovKid at 09:54, 24 December 20172017-12-24T09:54:38Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I don't <del style="font-weight: bold; text-decoration: none;">really </del>recommend this mod with a worn out blower, but rather with a new one, or one in good working order. Old electric motos can draw considerably more power just to start them up which is why some owners experience a blown fuse or uprate the fuse to compensate - not a good move. If yours is close to 30 years old, it is due for replacement, at which point you may wish to <del style="font-weight: bold; text-decoration: none;">try </del>this upgrade at the same time. It has little impact on cosmetics. If your blower <del style="font-weight: bold; text-decoration: none;">uinit </del>is in good condition, you can fit a PWM controller with the dash in place fairly easily.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I don't recommend this mod with a worn out blower <ins style="font-weight: bold; text-decoration: none;">that is drawing massive amps</ins>, but rather with a new one, or one in good working order. Old electric motos can draw considerably more power just to start them up which is why some owners experience a blown fuse or <ins style="font-weight: bold; text-decoration: none;">have to </ins>uprate the fuse to compensate - not a good move. If yours is close to 30 years old, it is due for replacement, at which point you may wish to <ins style="font-weight: bold; text-decoration: none;">do </ins>this upgrade at the same time. It has little impact on cosmetics. If your blower <ins style="font-weight: bold; text-decoration: none;">unit </ins>is in good condition, you can fit a PWM controller with the dash in place fairly easily.</div></td></tr>
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</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13372&oldid=prevCovKid at 09:52, 24 December 20172017-12-24T09:52:56Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:52, 24 December 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. We concluded (on the maths alone) that controlling the fan using pulse width modulation (PWM) would be far more efficient than using the resistors that VW fitted, and potentially form part of a basic climate control, although we didn't expand the project further. However, we couldn't see why PWM wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. We concluded (on the maths alone) that controlling the fan using pulse width modulation (PWM) would be far more efficient than using the resistors that VW fitted, and potentially form part of a basic climate control, although we didn't expand the project further. However, we couldn't see why PWM wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller also works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they <del style="font-weight: bold; text-decoration: none;">tend to be </del>power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve <del style="font-weight: bold; text-decoration: none;">power </del>as much as you can, even if its the starter battery. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller also works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they <ins style="font-weight: bold; text-decoration: none;">are </ins>power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve as much as you can<ins style="font-weight: bold; text-decoration: none;">, particularly when stationary</ins>, even if its the starter battery. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but basically, PWM involves the power being switched on and off to the blower faster than you could do it yourself, almost like a variable strobe, rather than all the excess current used up in heat via the resistors. If you ever played with small DC motors as a kid, you'll know that even when the power is disconnected briefly, the motor will still spin on a little, and that whats at work here - plus there is the luxury of being able to set any speed you want from zero to flat out speed.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but basically, PWM involves the power being switched on and off to the blower faster than you could do it yourself, almost like a variable strobe, rather than all the excess current used up in heat via the resistors. If you ever played with small DC motors as a kid, you'll know that even when the power is disconnected briefly, the motor will still spin on a little, and that whats at work here - plus there is the luxury of being able to set any speed you want from zero to flat out speed.</div></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13371&oldid=prevCovKid at 09:51, 24 December 20172017-12-24T09:51:07Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:51, 24 December 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Why fit a PWM controller to the dash fan and what is PWM?'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Why fit a PWM controller to the dash fan and what is PWM?'''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. We concluded (on the maths alone) that controlling the fan using pulse width modulation (PWM) would be far more efficient than using the resistors that VW fitted, and potentially form part of a basic climate control. <del style="font-weight: bold; text-decoration: none;">We </del>couldn't see why PWM wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. We concluded (on the maths alone) that controlling the fan using pulse width modulation (PWM) would be far more efficient than using the resistors that VW fitted, and potentially form part of a basic climate control<ins style="font-weight: bold; text-decoration: none;">, although we didn't expand the project further</ins>. <ins style="font-weight: bold; text-decoration: none;">However, we </ins>couldn't see why PWM wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller also works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve power as much as you can, even if its the starter battery. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller also works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve power as much as you can, even if its the starter battery. </div></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13370&oldid=prevCovKid at 09:50, 24 December 20172017-12-24T09:50:08Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:50, 24 December 2017</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller also works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve power as much as you can, even if its the starter battery. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller also works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve power as much as you can, even if its the starter battery. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM involves the power being switched on and off to the blower <del style="font-weight: bold; text-decoration: none;">at high speed</del>, almost like a variable strobe, rather than excess current used up in heat via the resistors. <del style="font-weight: bold; text-decoration: none;">With PWM</del>, the <del style="font-weight: bold; text-decoration: none;">lower </del>the <del style="font-weight: bold; text-decoration: none;">speed</del>, <del style="font-weight: bold; text-decoration: none;">the less amps are being used </del>plus there is the luxury of being able to set any speed you want from zero to <del style="font-weight: bold; text-decoration: none;">full </del>speed.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but <ins style="font-weight: bold; text-decoration: none;">basically, </ins>PWM involves the power being switched on and off to the blower <ins style="font-weight: bold; text-decoration: none;">faster than you could do it yourself</ins>, almost like a variable strobe, rather than <ins style="font-weight: bold; text-decoration: none;">all the </ins>excess current used up in heat via the resistors. <ins style="font-weight: bold; text-decoration: none;">If you ever played with small DC motors as a kid</ins>, <ins style="font-weight: bold; text-decoration: none;">you'll know that even when </ins>the <ins style="font-weight: bold; text-decoration: none;">power is disconnected briefly, </ins>the <ins style="font-weight: bold; text-decoration: none;">motor will still spin on a little</ins>, <ins style="font-weight: bold; text-decoration: none;">and that whats at work here - </ins>plus there is the luxury of being able to set any speed you want from zero to <ins style="font-weight: bold; text-decoration: none;">flat out </ins>speed.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some time ago I put up a video summary to show how it works using a brand new blower motor. See: </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some time ago I put up a video summary to show how it works using a brand new blower motor. See: </div></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13369&oldid=prevCovKid at 09:43, 24 December 20172017-12-24T09:43:57Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<col class="diff-marker" />
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<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:43, 24 December 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l4">Line 4:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Why fit a PWM controller to the dash fan and what is PWM?'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Why fit a PWM controller to the dash fan and what is PWM?'''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. <del style="font-weight: bold; text-decoration: none;">Controlling </del>the fan using pulse width modulation (PWM) <del style="font-weight: bold; text-decoration: none;">is </del>far more efficient than using the resistors that VW fitted. We couldn't see why <del style="font-weight: bold; text-decoration: none;">it </del>wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. <ins style="font-weight: bold; text-decoration: none;">We concluded (on the maths alone) that controlling </ins>the fan using pulse width modulation (PWM) <ins style="font-weight: bold; text-decoration: none;">would be </ins>far more efficient than using the resistors that VW fitted<ins style="font-weight: bold; text-decoration: none;">, and potentially form part of a basic climate control</ins>. We couldn't see why <ins style="font-weight: bold; text-decoration: none;">PWM </ins>wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve power as much as you can, even if its the starter battery. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller <ins style="font-weight: bold; text-decoration: none;">also </ins>works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. This probably matters less in a car, but in a camper its important to conserve power as much as you can, even if its the starter battery. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM involves the power being switched on and off to the blower at high speed, almost like a variable strobe, rather than excess current used up in heat via the resistors. With PWM, the lower the speed, the less amps are being used plus there is the luxury of being able to set any speed you want from zero to full speed.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM involves the power being switched on and off to the blower at high speed, almost like a variable strobe, rather than excess current used up in heat via the resistors. With PWM, the lower the speed, the less amps are being used plus there is the luxury of being able to set any speed you want from zero to full speed.</div></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13310&oldid=prevCovKid at 16:34, 19 August 20162016-08-19T16:34:38Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:34, 19 August 2016</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I don't really recommend this mod with a worn out blower, but rather with a new one, or one in good working order. Old <del style="font-weight: bold; text-decoration: none;">motops </del>can draw considerably more power just to start them up which is why some owners experience a blown fuse. If yours is close to 30 years old, it is due for replacement, at which point you may wish to try this upgrade at the same time. It has little impact on cosmetics. If your blower uinit is in good condition, you can fit a PWM controller with the dash in place fairly easily.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I don't really recommend this mod with a worn out blower, but rather with a new one, or one in good working order. Old <ins style="font-weight: bold; text-decoration: none;">electric motos </ins>can draw considerably more power just to start them up which is why some owners experience a blown fuse <ins style="font-weight: bold; text-decoration: none;">or uprate the fuse to compensate - not a good move</ins>. If yours is close to 30 years old, it is due for replacement, at which point you may wish to try this upgrade at the same time. It has little impact on cosmetics. If your blower uinit is in good condition, you can fit a PWM controller with the dash in place fairly easily.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13309&oldid=prevCovKid at 16:33, 19 August 20162016-08-19T16:33:45Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:33, 19 August 2016</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l18">Line 18:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I don't really recommend this mod with a worn out blower, but rather with a new one, or one in good working order. Old motops can draw considerably more power just to start them up which is why some owners experience a blown fuse. If yours is close to 30 years old, it is due for replacement, at which point you may wish to try this upgrade at the same time. It has little impact on cosmetics.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I don't really recommend this mod with a worn out blower, but rather with a new one, or one in good working order. Old motops can draw considerably more power just to start them up which is why some owners experience a blown fuse. If yours is close to 30 years old, it is due for replacement, at which point you may wish to try this upgrade at the same time. It has little impact on cosmetics<ins style="font-weight: bold; text-decoration: none;">. If your blower uinit is in good condition, you can fit a PWM controller with the dash in place fairly easily</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13308&oldid=prevCovKid at 16:32, 19 August 20162016-08-19T16:32:34Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:32, 19 August 2016</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l6">Line 6:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. Controlling the fan using pulse width modulation (PWM) is far more efficient than using the resistors that VW fitted. We couldn't see why it wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. Controlling the fan using pulse width modulation (PWM) is far more efficient than using the resistors that VW fitted. We couldn't see why it wouldn't work on the blower motor and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. <del style="font-weight: bold; text-decoration: none;">The Zaphira is </del>a <del style="font-weight: bold; text-decoration: none;">prime example of this where they could even catch fire. I know of no case with T3/T25/Vanagon models</del>, but the <del style="font-weight: bold; text-decoration: none;">mod is all the same, a marked improvement over inefficient resistors</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller works out cheaper to buy than replacing the resistors and is much less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor rather than thew click-notch control fitted as standard. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to produce, but they tend to be power-hungry and can get very hot. <ins style="font-weight: bold; text-decoration: none;">This probably matters less in </ins>a <ins style="font-weight: bold; text-decoration: none;">car</ins>, but <ins style="font-weight: bold; text-decoration: none;">in a camper its important to conserve power as much as you can, even if its </ins>the <ins style="font-weight: bold; text-decoration: none;">starter battery</ins>. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM involves the power being switched on and off at high speed, almost like a variable strobe, rather than excess current used up in heat via the resistors. With PWM, the lower the speed, the less amps are being used plus there is the luxury of being able to set any speed you want from zero to full speed.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM involves the power being switched on and off <ins style="font-weight: bold; text-decoration: none;">to the blower </ins>at high speed, almost like a variable strobe, rather than excess current used up in heat via the resistors. With PWM, the lower the speed, the less amps are being used plus there is the luxury of being able to set any speed you want from zero to full speed.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some time ago I put up a video summary to show how it works using a brand new blower motor. See: </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some time ago I put up a video summary to show how it works using a brand new blower motor. See: </div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I don't recommend this mod with a worn out blower, but rather with a new one, or one in good working order. If yours is close to 30 years old, it is due for replacement, at which point you may wish to try this upgrade at the same time. It has little impact on cosmetics.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I don't <ins style="font-weight: bold; text-decoration: none;">really </ins>recommend this mod with a worn out blower, but rather with a new one, or one in good working order<ins style="font-weight: bold; text-decoration: none;">. Old motops can draw considerably more power just to start them up which is why some owners experience a blown fuse</ins>. If yours is close to 30 years old, it is due for replacement, at which point you may wish to try this upgrade at the same time. It has little impact on cosmetics.</div></td></tr>
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</table>CovKidhttps://club8090.co.uk/w/index.php?title=VW_Electrics_Dash_Fan_Control_Upgrade&diff=13307&oldid=prevCovKid at 16:28, 19 August 20162016-08-19T16:28:28Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:28, 19 August 2016</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Why fit a PWM controller to the dash fan and what is PWM?'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Why fit a PWM controller to the dash fan and what is PWM?'''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK. We couldn't see why it wouldn't work and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>This project came about through early discussions with Ghost123UK<ins style="font-weight: bold; text-decoration: none;">. Controlling the fan using pulse width modulation (PWM) is far more efficient than using the resistors that VW fitted</ins>. We couldn't see why it wouldn't work <ins style="font-weight: bold; text-decoration: none;">on the blower motor </ins>and as you'll see below - it does. I have since posted a two-part summary on Youtube.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller <del style="font-weight: bold; text-decoration: none;">increasingly </del>works out cheaper to buy than <del style="font-weight: bold; text-decoration: none;">using </del>resistors <del style="font-weight: bold; text-decoration: none;">to control fan speed, </del>is <del style="font-weight: bold; text-decoration: none;">more efficient (</del>less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to <del style="font-weight: bold; text-decoration: none;">make</del>, but they tend to be power-hungry and can get very hot. The Zaphira is a prime example of this where they could even catch fire. I know of no case with T3/T25/Vanagon models, but the mod is all the same, a marked improvement.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>A PWM controller works out cheaper to buy than <ins style="font-weight: bold; text-decoration: none;">replacing the </ins>resistors <ins style="font-weight: bold; text-decoration: none;">and </ins>is <ins style="font-weight: bold; text-decoration: none;">much </ins>less taxing on cables and battery), arguably less of a fire risk, and you get infinite control right up to the flat out speed of the motor <ins style="font-weight: bold; text-decoration: none;">rather than thew click-notch control fitted as standard</ins>. Car manufacturers tended to use resistors (and some still do today) as they're cheaper to <ins style="font-weight: bold; text-decoration: none;">produce</ins>, but they tend to be power-hungry and can get very hot. The Zaphira is a prime example of this where they could even catch fire. I know of no case with T3/T25/Vanagon models, but the mod is all the same, a marked improvement <ins style="font-weight: bold; text-decoration: none;">over inefficient resistors</ins>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM <del style="font-weight: bold; text-decoration: none;">means pulse width modulation - </del>the power being switched on and off at high speed, almost like a variable strobe, rather than <del style="font-weight: bold; text-decoration: none;">as with resistors, </del>excess current used up in heat. With <del style="font-weight: bold; text-decoration: none;">resistors, you'll use the same power regardless of speed, with </del>PWM, the lower the speed, the less amps are being used plus there is the luxury of being able to set any speed you want from zero to full speed.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>I'll skip the science, but PWM <ins style="font-weight: bold; text-decoration: none;">involves </ins>the power being switched on and off at high speed, almost like a variable strobe, rather than excess current used up in heat <ins style="font-weight: bold; text-decoration: none;">via the resistors</ins>. With PWM, the lower the speed, the less amps are being used plus there is the luxury of being able to set any speed you want from zero to full speed.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some time ago I put up a video summary to show how it works using a brand new blower motor. See: </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Some time ago I put up a video summary to show how it works using a brand new blower motor. See: </div></td></tr>
</table>CovKid