QuestionI have a 2001 Audi A6 Quattro 2.7T (turbo). My a/c would blow warm air after
the car idled for a few minutes or was moving in heavy stop-and-go traffic.
When this happened, the temperature gauge would start going up after a while.
If it got as high as 5/6, I turned off the A/C to avoid overheating the engine,
and the temperature would return to normal. The problem seemed worse when the
weather was hottest and the engine was already warm. The dealer replaced the
"high pressure switch" and topped off the freon (although they found no leak).
It seemed to help a little, but the problem persists. Setting the temp on "LO"
may help a little bit but even then it could take a few minutes for the a/c to
really start blowing cold air, especially if the engine is warm. Two other
things that may be relevant: I know there is a slow leak in the "aftercooler
(?)" (cools the turbo charger) that requires me to add about 1 qt of coolant
every month (though lately it's been more frequent). Also, last night I found
that the engine was still hot to the touch after the car had been sitting in the
garage for 5 hours - this after having driven for a little more than an hour in
normal suburban traffic on a 95 degree day with the a/c going the whole time.
I've resisted fixing the cooling system problem because it's cheaper to refill
the coolant. Does the coolant leak have something to do with the a/c? Are
there other things that might be causing this problem. Thanks.
AnswerHi Goeff,Sounds like you may have combo of cooling problems.Loss of coolant is a main issue,find and correct first before you go into the a/c. check if the fans on the radaitor are both coming on.If not,overheating can cause poor a/c performance.
Good luck, davidt
