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Climate Control 90 Q coupe
Here is a clip I have saved from a post a couple of months ago. Sounds right on.
> From firstname.lastname@example.org Mon Apr 24 09:12:32 1995
> Subject: Temp Sensor Info
> Several months ago one of the outside temperature sensors (part of
> the heating/AC system) on my 1990 200Q failed. The symptoms were an
> outside temperature indication that was always about 12 degrees lower
> than the true temperature. I compared the resistance of the two
> sensors at ambient temperature and found that the thermistor under
> the window read approximately 1000 ohms at 25 degrees C, while the
> front thermistor behind the grill read almost 1800 ohms at 25 deg C.
> Since these are negative temp coefficient thermistors and the control
> module always displays the temp of the coolest sensor, it was obvious
> that the grill sensor was defective. A quick call to Audi and I found
> that they would sell me a new one for only $95 + tax. Being frugal,
> I characterized the temp -resistance relationship of the control module and of
> the working thermistor. Steve Buchholz also provided me with the temp -
> resistance values from the Bently and they matched what I
> measured. Bottom line is that I found a thermitor from Digikey for
> approximately $2.00 that replaces the Audi thermistor. I installed
> it this weekend and it works perfectly. If anyone has this problem, drop me
> a line and I'll describe how to replace it. The new thermistor mounts into
> the old thermistor housing.
> Fred L. DeRoos
... boy, it sounds like the exact problem you describe! As far as I know,
Fred's address is <email@example.com>, you might want to try dropping him a
line ... Thanks Fred!