New S2 Avant Nothelle N300 owner

[Mikes2]

For the fan problem I'd have a good look at the wiring on the resistor pack.

[Tractor Dave]

For the fan problem I'd have a good look at the wiring on the resistor pack.

I have a new relay coming from Germany (thanks to rxl). If that doesn't fix it, I will look there next.

[M2ki]

You can remove 3rd realy from the fuse panel, when the fan kicks in, to make sure it is the after run module, whats causing it.

For the fan problem I'd have a good look at the wiring on the resistor pack.

How does faulty resistor pack or wiring on the pack turn on the fan? It is a passive component and gets its power from the fan relay or afterrun module.

[Mikes2]

Well it happened to me. Bad contacts on the resistor was causing the fan to run all the time.

[M2ki]

How can bad contacts cause a running fan? Bad contacts on the resitor can cause a NOT running fan.
As I said before, resistor is just a dumb passive element. It is not powered. It can get power only through relay controlled by afterun module or relay controlled by thermoswitch on radiatior.
Both power inputs for the resitor will end up in a relay. Blue and red on schematic.

[Tractor Dave]

I've been referring to this which is brilliant!

https://forums.quattroworld.com/s4s6/msgs/21503.phtml

[Tractor Dave]

I received a parcel from Germany.
rxl is a very kind man he got some bits for me.
I’m going to be busy this afternoon.



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[Tractor Dave]

I fitted the new relay and hurray, no fan.



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[Tractor Dave]

I thought it was time to fill up the washer reservoir. I did and then drip drip drip from underneath!
So, bumper off (again).


And jack up left side of car to give access.


It seems to be the grommet for the washer pump. I tried removing it and cleaned it in hot washing up water and replaced it. Good for a few mins but then started leaking again.
Anyone have a good spare?



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[Trist28]

Car is looking great - I'm hoping to pay you a visit this year in mine like we said... Detailing didn't happen last year - But will be very soon!

I'm having the same fan issue, which started while it was sat garaged! Been through all the tests like you (found the same page etc) - Save me scanning back over the thread - What number relay is it and where did you source one from? PM if you prefer.

[Tractor Dave]

Nice to hear from you again.
The part number for the relay is 447965571a. TPS do them but rxl got me one a bit cheaper from Germany.
My theory is that the circuit within the relay is sensitive to repeated power disruption.
Kettle is always on if you fancy a spin out west. Cheers


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[Trist28]

Cheers Dave. What kind of money are we talking, from memory I recall they are pretty expensive! If you cant remember Ill give TPS a call on Monday - Last year I tried some spare (same) relays I had, but either that is not the issue or I have a few knackered relays!

[Tractor Dave]

Cheers Dave. What kind of money are we talking, from memory I recall they are pretty expensive! If you cant remember Ill give TPS a call on Monday - Last year I tried some spare (same) relays I had, but either that is not the issue or I have a few knackered relays!

About £100 with the vat.

[Trist28]

Ouch! Ill call Monday and get it ordered - Was a German one much cheaper?

[newsh]

Cheers Dave. What kind of money are we talking, from memory I recall they are pretty expensive! If you cant remember Ill give TPS a call on Monday - Last year I tried some spare (same) relays I had, but either that is not the issue or I have a few knackered relays!

I think they must go wrong with age, I sent Dave my spare relay which didn’t fix his problem, he sent it back and i tried it on my car and it was bad.
There’s a little electrolytic cap in there which maybe dries out, I will have to try replacing it!