[s-cars] Cooling fan question for 94 S4

James C. Mairs jmairs at cetaq-americas.com
Thu Aug 16 19:23:33 EDT 2007 

Is the after run circuit a two stage deal?  Meaning does the after run pump
function independently from the rad fan? Or they will both trigger at the
same time all the time?

I am certain that the after run pump is running on my car, but I am not
convinced that the rad fan is kicking in *all* the time.  I replaced the
power lead from the resistor packs (which tested fine) the green power lead
from resistor packs was full of corrosion and therefore the aux fan itself
was never getting power.  Replaced the connector and the fan cycles on
occasion, but the pump always *after runs*, placing hand on pump test.



-- 
James C. Masaru Mairs 
Technical Solutions Manager 
CeTaQ Americas 
P.O. Box 7332 Hudson NH 
Office:    603-883-7843 
Cell:      603-759-4221 
Email:     jmairs at cetaq-americas.com 
Web:       www.cetaq-americas.com 

> -----Original Message-----
> From: s-car-list-bounces at audifans.com [mailto:s-car-list-
> bounces at audifans.com] On Behalf Of Aaron Ryba
> Sent: Thursday, August 16, 2007 2:04 PM
> To: stott at gwi.net
> Cc: s-car-list
> Subject: Re: [s-cars] Cooling fan question for 94 S4
> 
> 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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