[s-cars] Couple of questions

Sean Douglas quattro20v at telus.net
Tue Oct 18 11:41:02 EDT 2005


The electrical fan and aux water pump are triggered together by a thermo
switch mounted in a water pipe just under the intake manifold. If the
coolant temp exceeds a certain limit (105 celcius I think) and the car
is shut off, then the fan and pump will turn on for 10 min max.

It takes quite a lot to exceed 105 C water temp and in my case, the
fan/pump never came on. I installed a lower temp switch which read
underhood air temp (like on the older models) and now it comes on about
50% of the time. I tried to locate a lower temp thermo-switch that would
fit in the stock location, but couldn't (i.e. matching threads).

You can test your circuit by pulling the wires off the thermo switch and
shorting them together with the key off - the fan and pump should run.


Sean Douglas
1997 Audi S6//RS2-spec
1990 Audi 90 quattro 20v

> -----Original Message-----
> From: s-car-list-bounces at audifans.com 
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Brian Armstead
> Sent: Tuesday, October 18, 2005 7:37 AM
> To: matt ludwig; S-CAR-List at audifans.com
> Subject: [s-cars] Couple of questions
> Some newbie questions for you all:
> When I shut my car down after a hard run, should the main fan 
> come on? 
> When I used to shut down my '89 200q and '86 5Kt, the big fan 
> would always come on as soon as I shut down my car.
> Also, when should the aux coolant pump cycle on with the S4?
> Lastly,
> When sorting through my large collection of type 44 goodies, 
> I came acorss a wastegate srping with light green markings 
> painted on it. 
> Anyone have a clue if I can use this to obtain moore boost?
> Thanks,
> Brian
> 93 S4
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