[s-cars] Cooling fan question for 94 S4

[Aaron Ryba]

I pulled the two wires off of the sensor and shorted them together and the fan ran. The car was very hot (over 100 degrees outside and ran the car for a while) and in the year I have owned the car I have never heard the elec fan or the afterrun pump run. After jumping the wires the fan & pump turned off about 5 minutes later. It seems like the relay, fan and pump are working properly and just the sensor is dead. 

Aaron

----- Original Message ----
From: Stott Hare <stott at gwi.net>
To: Aaron Ryba <aaronryba at yahoo.com>
Sent: Wednesday, August 15, 2007 2:34:30 PM
Subject: RE: [s-cars] Cooling fan question for 94 S4

What did you do to determine your switch is bad?  Cold engine/cold coolant
and the switch has continuity (~0 Ohms) between the contacts?  Or did you
unplug the harness leads, short between them and not have the fan run?  Not
have power on one of the harness leads?

I believe that only receives power for a set period of time after the car is
shut off, unless you have a faulty after run relay.  I guess what I'm saying
is if you tried these tests with having run the car previously, it's
possible the relay hadn't turned on power to that circuit and you could have
received a false failure.

-S

-----Original Message-----
From: Aaron Ryba [mailto:aaronryba at yahoo.com] 
Sent: Wednesday, August 15, 2007 1:35 PM
To: s-car-list
Cc: stott at gwi.net
Subject: Re: [s-cars] Cooling fan question for 94 S4

Stott, your memory is correct. I just confirmed that my after run thermo
switch is also dead.
Does anyone know where it source this switch? A brief look at the usual
suspects for FCOL, SJM, Blau, S-Cars, etc and I find only the 3 prong temp
switch.

Also, perhaps my AC is not running cool enough because my elec. fan never
comes on? I hope that is the easy fix. Most likely not though.

Aaron Ryba
95 S6

------------------------------

Message: 2
Date: Wed, 15 Aug 2007 10:22:43 -0400
From: "Stott Hare" <stott at gwi.net>
Subject: Re: [s-cars] Cooling fan question for 94 S4
To: "'Young, Steve'" <sryoung at trane.com>, <s-car-list at audifans.com>
Message-ID: <000001c7df47$be4d0860$2f03000a at lanthanum>
Content-Type: text/plain;    charset="us-ascii"

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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