Re: Injector cooling fan times

[Keith Simpson <ksimp@cgrams.com>]

Wow!  This is good info, Tony.  Thank you very much.  It is so
well outlined that, if you don't mind, I will cc to the list.  I
have tried to make heads or tails from my Haynes manual of the
system, but you have distilled it down to one simple paragraph. 
Are you a tech writer?  

Tony Lum wrote:
> 
> At 08:14 AM 2/10/98 -0500, you wrote:
> >Pardon me for being ignorant - I am new to the marque - and
> >loving it I might add.  Am I to understand that it is that little
> >injector cooling fan that makes all that noise after I shut off
> >my car, and not the much bigger cooling fan?  And the purpose
> >being . . . . prevent vapor lock?  I have much confusion
> >(obviously) about the cooling circuit in my car.  Is the turbo in
> >the same circuit - seems I've read something about a second water
> >(coolant) pump for the turbo - and radiator, and fan?
> >
> >
> >87 5KTQ  153Kmi.
> >
> Yes, there is a injector cooling fan.  Its controlled by a thermoswitch
> mounted on a flange off the left rear of the valve cover.  There is also an
> auxilliary water pump.  Its gold motor sitting on top of the ABS control
> unit just behind the radiator fan.  It is activated by a 2 terminal
> thermoswitch mounted in the outlet flange of the upper radiator hose.  It
> turns on the pump along with the 1st stage of the radiator fan to cool the
> engine and turbo.  To test the injector fan, remove the single wire and
> ground it switching on the fan. To test the aux pump circuit, remove the
> leads to the 2 terminal thermoswitch and short together.  The rad fan
> should run at low speed and you should be able to feel with your hand that
> the aux pump is running.  If it doesn't you might need a new relay (located
> inside the car in front of your left knee).  There is also a fuse
> controlling the whole thing.  If the motors do run, yet never seem to turn
> on during actual use, the thermoswitches could be bad.
> 
> HTH,
> 
> -Tony
> _________________________________________________________________________
> 
> Tony Lum  (tlum@flash.net)                  1987 5000CS Turbo Quattro
> Berkeley, California, USA                      1985 4000CS Quattro
> Audi Owner/Driver/Mechanic by Necessity ;^)      1980 5000S Sedan
> _________________________________________________________________________

-- 
ksimp@cgrams.com
wolfeboro, nh
603-642-7557  x1227