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2000 Mercury Mystique

Question: Why does the car stall at idle when using the A/C?

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echospec, 2.0L 4 Cylinder, Melbourne, FL, March 09, 2010, 11:08
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 Rookie

We have ruled out computer problem, replaced the throttle position sensor, ruled out a cat problem. The car runs good without the A/C. It has just started throwing a oxygen sensor code, but this is a new thing.

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  • Answer #1

    hemicuda March 09, 2010, 13:50
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     Master

    Sometimes water crystals will freeze in the freon system and when the AC is turned on it will put excessive pressure on the compressor and possibly kill the motor, Have your AC system serviced

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