heater fan

[splod77]

im replacing the heater fan as the old one had seized but after testing have found that the resistor that controls the speeds isnt working as well.
Does anyone know where you can get a replacement resistor as i cant find them anywhere?
thanks paul

[lloydy]

brickwerks sell them

[splod77]

thanks,
with the old blower removed ive discovered another problem theres 2 foam backed flaps loose inside, ive had a look but cant find where they attach 2, has anybody got any idea where these are from or have a good diagram
thanks paul

[chuggers72]

Funnily enough I'm sorting my heater at the moment and I found a flap lying in the bottom of the heater casing. The other was still in place - as long as we're talking about the same thing each one hangs from two clips in the corners - they are marked in the pic (with new foam on) and are hanging down from inside the casing - hope this makes sense! Theres no mechanism to move them - they are gravity reliant as far as I can tell ! They should just clip back in with a little persuasion

[splod77]

Brilliant thanks dude

[California Dreamin]

As a Side Note* I know the original resistors get hot...in fact, I've seen them melt the plastic housing where they are mounted...therefore, wouldn't it make sense to bolt them directly to the metal dash with heat-sink paste applied to their bases rather than remounting them on the plastic heater.....or am I talking crap?

I've not done the job myself 'yet' but thought it made sense to use the dash as a sink for those hot resistors.

Martin

[Oldiebut goodie]

Good point. If they the ones pictured above - they are meant to be mounted on a metal heat sink, I am surprised that they are originally mounted on plastic.

[chuggers72]

Yes - those gold resistors in the pic are the pair that Brickwerks supply to replce the original one - mine was looking well past it and cracked (the wiring was really brittle so replacing the whole lot!). Been contemplating where to mount them as it seemed crazy to put them where the original was fixed. Makes sense to mount them external of the heater box away from plastic on the metal front bulkhead (if thats the right term for it) to which the heater box is attached. Did not realise there was such thing as heatsink paste though - is it a definte requirement?

[ghost123uk]

Did not realise there was such thing as heatsink paste though - is it a definte requirement?

Not essential in this case, but it's dead cheap from Maplins or similar shops. Also of course Ebay here at £1.68

[chuggers72]

Cheers Ghost - by reading the Ebay description it looks like it bonds it in place as well so maybe no need for screwing into dash?

[ghost123uk]

No, you do need to screw it down.

[chuggers72]

Fair enough - no short cuts

[bigherb]

I am surprised that they are originally mounted on plastic.

They are mounted in the cool airflow from the fan the only times they melt the plastic is when the fan seizes and no airflow to cool them.

[Oldiebut goodie]

It is odd to mount any resistor on any thermoplastic especially a power one. Once the airflow has stopped there is still residual heat in the resistor which cannot be good for the plastic. Even veroboard can be burned with a small resistor set too close to the board.