[s-cars] Cooling fan question for 94 S4

[James C. Mairs]

Thanks Calvin, 

Replaced the rad sensor when I did the motor rebuild, shamefully I still
need to flush the system once or twice more.

Very interesting then, as it seems I may have something intermittent in the
system.  I will have to double check things but I am certain I have had the
rad fan NOT running when the after run water pump was.  Yet I hear the rad
fan kick in on hot days after parking for a bit need to grab that pump to
double check then I guess... Of course I never double checked the pump
circuit itself.  Wonder if that is where an issue may lay.

Ok more work to do ... blah

-Jim

> -----Original Message-----
> From: calvinlc at earthlink.net [mailto:calvinlc at earthlink.net]
> Sent: Thursday, August 16, 2007 11:53 PM
> To: James C. Mairs; 's-car-list'
> Subject: RE: [s-cars] Cooling fan question for 94 S4
> 
> They will both run at the same time.  One two wire switch as described
> before towards the front of the engine block.  Keep in mind this switch
> has
> nothing to do with running the radiator fan while the car is running.
> That
> is controlled by the aforementioned switch in the radiator lower driver
> side - almost impossible to get to - at least it was worth it to me to pay
> $60 for the labor :)
> --Calvin
> 
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of James C. Mairs
> Sent: Thursday, August 16, 2007 5:24 PM
> To: 's-car-list'
> Subject: Re: [s-cars] Cooling fan question for 94 S4
> 
> 
> 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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