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Q: Why the AC compressor turns off on lower fan speeds on 1990 Nissan 300ZX

The AC Compressor only comes on when the controls are on high. Tried 3 different resistors still same result. I even replaced the controls nothings changed, it only works on high.
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The freon level may be low causing the evaporator to freeze at low fan speeds. Have the A/C pressures checked.
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