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A dirty or defective idle air control valve (IAC). When you initialize the a/c, it sends a signal over to the Power Control Module(PCM)(Computer) and it energizes both the a/c clutch, and the IAC to raise the idle. If not, then the compressor is bad. The IAC valve(MOTOR)just needs 2 b cleaned (after it's off) with a Good Carberator cleaner-clean it until the cleaner runs clear & the pintel valve -inside-moves freely.

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โˆ™ 2004-11-20 22:47:46
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Q: What could cause a 1991 Lincoln Town Car to stop running when you turn on the AC?
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