I also have a 90 V8 quattro. The fan works but the heat control is
unregulated. It's trying to find the median range but it either cycles
too cold and then too hot. I believe it may be the sensor by fan in the
dash that draws in cabin air past the sensor. I replced the instrument
cluster bulbs and had to remove the dash. I believe I may have disturbed
the sensor that controls the regulation of the electronic module. Anyone
have other ideas?


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Audi3.6
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