[s-cars] Cooling fan question for 94 S4

[Stott Hare]

Working from memory here... The after run switch is the forward most sensor
on the water manifold, with two separate male pins.  Assuming your after run
relay is functioning properly, one of those pins should be supplied power
(for a period of time?).  If you remove and jumper between those two female
harness connections the secondary fan should run, and you should feel the
after run pump humming.  This is a quick and dirty test that the fan works.

If it doesn't, you get to start a more methodical diagnosis.  The ground and
power connections to the secondary fan are below the LF headlamp on the
frame rail.  Ground is a ring terminal bolted down in a shared ground point.
Power is a single red (or green?) connector, passing through a grommet down
to the resistor pack bolted on the underside of fender support, above the
stock intercooler.

Another test if your AC is working normally, would be to turn the AC on.
The secondary fan should run on low speed.  The temp sensor driving fan
operation is located on the left rear lower corner of the radiator, above
the lower radiator hose.

Hope some of this helps.
-S

Stott Hare
95 S6A

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Young, Steve
Sent: Wednesday, August 15, 2007 9:53 AM
To: s-car-list at audifans.com
Subject: [s-cars] Cooling fan question for 94 S4


It has occurred to me recently that I haven't heard the cooling fans
cycle on lately.  What and where is the sensor that activates the
cooling fans for regular operation, and is there a test procedure?
Maybe I have a bad after-run switch also, because I never hear the fan
cycle of after shutting the car off either.

The car does not run hot or overheat, and I have spun the fans by hand
to verify that they are not seized.  Haven't had time to check anything
else yet.  Any help is appreciated.  TIA

Regards,

				TRANE
Steven Young
Local Operations Manager
Albany Office
*  Tel. (518) 724-1453
* Fax (518) 785-4359
* sryoung at trane.com

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