Lower temp radiator fan switches

Post by **danmetallic** » 19 Nov 2014, 20:00

I've heard these are available. Does anyone know where? I haven't been able to find any.

Post by **300CE** » 19 Nov 2014, 20:30

Hi Dan, found a post saying that a VR6 stat fits if any good? Might be worth dropping a PM to 123-jn if so mate:

https://club8090.co.uk/forum/viewtopic.php?p=8022900" onclick="window.open(this.href);return false;

Website · Post by **CovKid** » 19 Nov 2014, 20:36

Different stat though - thats the one that decides when the water really needs to circulate and is in the engine bay. You shouldn't need to lower the fan stat/switch though. They don't exist to my knowledge. It kicks in way before danger level and thats all its for. I do have a chicken switch though. Some deride them but I'd much rather have a manual overide myself. Its reassuring (more reassuring than my old friend 1664 in fact).

Post by **300CE** » 19 Nov 2014, 20:47

Cheers for confirming Ralph

Post by **danmetallic** » 19 Nov 2014, 21:24

Thanks chaps. I'm sure Brickwerks were selling them at some point.

I do have a chicken switch and a new thermo switch but the fan just isn't kicking in when it should.

Hot wired fan and its all working fine. Radiator is getting up to temp and thermostat is all working correctly.

In the two years I've had the van the fan has never kicked in when it should.

Nothing major, just one of those things I'd like to nail.

E D I T: fitted new coolant temperature sender also. Will do the resistor trick to make sure the gauge is reading correctly also. Maybe I've just had a bad thermo switch.

Post by **Oldiebut goodie** » 19 Nov 2014, 21:43

I have never had my fan come on in 10 years - never overheated and everything is in good order.

Post by **California Dreamin** » 19 Nov 2014, 22:33

I would agree to some extent......you are very unlikely to get the fan coming on during the autumn/winter months (unless you leave it idling for 20 minutes or more) However, I have found that mine is very predictable in the summer. Clicking in and out on a regular cycle if left idling after a run, typically triggering the moment the needle nudges past it's twelve O'clock position.
Mines a 2.1 Petrol (I know Diesels behave a little differently)

Martin

Post by **123-jn** » 19 Nov 2014, 22:46

According to haynes the original fan switches had a lower switch temp for the 2.1 engines than the 1.9 so anyone with a 1.9 may be able to look into this. I'm not sure whether aftermarket ones differentiate?

Post by **danmetallic** » 20 Nov 2014, 13:38

Interesting I let her idle for about 30 mins this morning and the high speed fan kicked in with the needle 3/4 of the way up (low speed still on checkin switch). So all seems to be working as should. Lots of cycling on and off

E D I T so seems the new thermo switch is working.

Post by **danmetallic** » 20 Nov 2014, 13:48

Out of interested where is the earth for the fan located? With the thermo switch?

Website · Post by **CovKid** » 21 Nov 2014, 07:28

Just to confirm, my rad fan never kicks in at all this time of year either. Its just too cold out there. Even a light draught through radiator is enough to cool water. The other side of this ofcourse is that if fan kicks in more often, its lifespan would be reduced too. As for earth, its on the thermo switch.

Post by **bigherb** » 21 Nov 2014, 09:22

danmetallic wrote:Out of interested where is the earth for the fan located? With the thermo switch?

The fan earth goes back in the loom to the earth crowns on the A post next to the fuse box.

Post by **danmetallic** » 21 Nov 2014, 10:04

Def need to run the resistor test http://www.thesamba.com/vw/forum/viewtopic.php?t=464113" onclick="window.open(this.href);return false; on mine. Temp gauge is slightly out I'm sure.

Post by **ghost123uk** » 21 Nov 2014, 10:48

I posted earlier today here = https://club8090.co.uk/forum/viewtopic.p ... 5#p8039225" onclick="window.open(this.href);return false; re using a (nice n cheap and great fun) infra red thermometer to read the real coolant temperature.

Post by **California Dreamin** » 27 Feb 2015, 10:36

danmetallic wrote:Interesting I let her idle for about 30 mins this morning and the high speed fan kicked in with the needle 3/4 of the way up (low speed still on checkin switch). So all seems to be working as should. Lots of cycling on and off

E D I T so seems the new thermo switch is working.

Sounds like you need a new thermo-switch as it appears that 'low speed' isn't working allowing the temperature to rise to the 'second stage' where the high speed takes over.

Mine would dance between low and high speeds, literally back & forth every couple of seconds..cured with a new thermo-switch.

Obviously..having the low speed working will prevent the dial going so high before getting 'fan action'.

The reality is that not that many T25 owners ever get to experience 'high speed' on their fans. This is because, for the vast majority of driving, low speed fan circulation provides sufficient air movement to stop the temperature rising and reverse its direction. It is only those 'exceptional circumstances' ie: driving up a 1:8 mountain pass at 10mph for 10 minutes or more, that may generate too much heat for the low speed fan to curtail the temperature rise.

Martin

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