Audi s3 engine fan issue

[Umai Naa!!]

I'd still look at the fuse box on the top of the battery as well.

It's known to fail internally, and cause all sorts of electrical problems, some relating to the fans.

[gtronroids]

Hi Umai, I have probed and removed all of those fuses and they all tested fine. Do you know if there is another relay other than the fan control module under the battery?


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[Jenno007]

the fact that the fans come on with fuse 16 removed would to me mean that it cannot be the fuses on top of the battery?

if the fuses on top of the battery were gone I would imagine the fans wouldn't work full stop?

But I did have a good look at the fuses on top of the battery and nothing seemed wrong to me.

[gtronroids]

Jenno, have you jumped pin 1 and 2 on the thermo fan switch (the one on the side of the radiator)


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[Jenno007]

Jenno, have you jumped pin 1 and 2 on the thermo fan switch (the one on the side of the radiator)


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Nope havent done that, by jump do you mean run 12v direct to it?

I would of thought the fans would still come on with the AC though if it was the thermo fan switch?

Thanks for the suggestion though I'll try it tomorrow!

[gtronroids]

Just get a piece of wire with a spade connection on both ends plug one end into the top (1) then the other end into right (2) the fan should come on then jump the wires from right (2) then the other end into the left (3) with the key turned to on (not engine running just accessories)
Thermo fan switch connector in hand and looking at it should look like this:
|
one
| |
three two


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[Jenno007]

alright great thanks I'll try this tomorrow and report back

[gtronroids]

Try this for a better picture
VWVortex.com - How to test Rad. Fan control Module, or have fans run on high


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[schwartza3]

I remember seeing a few relays under the steering wheel area when I installed the afr gauge on my a3 8l, they are behind the panel between the pedals and the steering wheel, might be worth checking what they are? Good luck

[gtronroids]

Yeah I have looked at them but no one can confirm what is what, there are also some on the bulkhead in the engine bay and then I am sure there is another one up under the cowling where the ecu is also


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