Aija,

My symptoms were blowing cold air for brief periods and then blowing warm air. After shutting the car off for awhile, it would blow cold air. First attempt to fix was replacing the evaporator temp sensors. This didn't stop the problem. It turned out that I had a bad expansion valve. After replacing this, the air conditioner has worked perfect on some of the hottest days we've had and this was even with converting to R134A.

Bob

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BobH 90 R129