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Audi Quattro




1990 Audi Quattro

Heating / Cooling System Other Not applicable Always

Q:  The car runs great with the heat and A/C off, but when the heat or A/C is on, the car runs sluggishly.

It idles well for a few seconds, then the rpms dip from 1000 to 900 and back again when I'm standing still.

When I'm driving I notice a slight decrease in power and when I put it in neutral (stick) with the rpms over 2000, the rpms are supposed to dip to about 900-1000 and level out, but instead the rpms fall to zero and the car stalls out.

This only happens when I have the heat or A/C on. Other wise the car runs fine. What do you recommend?


A:  Could be a problem in the A/C Compressor. If the resistance from the compressor is too great, it loads the engine down and stalls it at times. Ed

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