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It could be that the engine is idled to low.
A2: There is an idle solenoid to boost idle speed when A/C on. It may be defective or there is a wiring problem; switch, fuse, etc. It may also not be adjusted right. Look at the far side of it (Not the throttle side) ; it should have a wrench adjustment. Give it 1/2 turn clockwise and see.
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Why does your engine fan turn on when the engine is off?
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