I've got a wire loose

[David.Ullrich at ferguson.com]

That's pretty much my experience with my 87.5 CGT. Three wire fan, 2 speeds. Low speed most of the time, high speed when REALLY hot or when AC pressures build up high. No sign of an after-run feature so far, but I don't drive the car hard during the last few minutes of a trip so it may not be hot enough to kick in when I park it. Do you think I should have an after-run? Any thoughts on what to look at?

Dave

Too Many Toys:
2002 VW Jetta GLS 1.8T Tiptronic
1993 RX-7 R1
1987.5 Audi Coupe GT "Special Build" 2.3 - Anthracite Black
1985 Chevy Impala SS
Former:
1981 Audi 4000 5+5
1982 Audi Coupe
1988 Audi 90 Quattro
1998 VW Passat GLS 1.8T



-----Original Message-----
From: Tony Lum [mailto:tlum at flash.net]
Sent: Wednesday, June 12, 2002 3:48 PM
To: quattro at audifans.com
Subject: RE: I've got a wire loose



Audi typically mates the 3 terminal fan motor (2 speeds built-in) with a
chassis mounted resistor to get the 3rd speed.  The T89 cars also have the
resistor.  Audi in its design "genius" always uses a relay to short out the
chassis mounted resistor as long as the engine is on.  It gives my old T43
5ks a pseudo after run fan feature which you can hear quite clearly as the
fan switches to low speed when you shut off the engine.  The exception is
the '87.5 CGT which doesn't have the chassis mounted resistor.  It uses the
fan motor's built in resistor for normal cooling and the direct high speed
terminal for the overheat and, I think, the A/C high pressure switch.

Regards,


--
Tony
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Tony Lum                                  1987 5000CS Turbo Quattro
Berkeley, California, U.S.A.                1985 4000CS Quattro
Audi Owner/Driver/Mechanic by Necessity ;^)   1980 5000S Sedan
                                                1987.5 Coupe GT
                                                 1983 Ur-quattro
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