buzzing/squeal from climate control?

[Ti Kan]

Stephen Ankney writes:
> Last night on the way home I noticed a slight buzzing sound coming from 
> behind the climate control area. This noise would stop when the climate 
> control was turned off. After awhile the buzzing turned into a loud 
> squeal/grinding noise. Almost sound like a small fan with a bad bearing. 
> Turning off the CC and restarting it seemed to make it go away, At least for 
> awhile. The noise would come and go at random. What is causing this noise? 
> Is the CC head shot? Is there some relay behind the CC head that is causing 
> this? Please give me some ideas...

A possibility is the inside air temperature sensor fan making noise.
It's a tiny little fan that draws air through the little grille on top
of the dashboard to the sensor.  The remedy is replacement.  Procedures
are in the Bentley manual.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
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