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ac clutch not engaging

1810 Views 11 Replies 3 Participants Last post by  John Wood
Im about to charge up my system but in order to do that i need the ac to be running and it doesnt seem to want to work without any freon in it.

Os there a way to overide this or diagnose that thus is actually the problem?
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Definitely run the test that Bob mentions to insure the engine fan/relay works. Otherwise, there are 2 inputs to the PCM which are the dash AC control and the clutch cycling switch (evaporator probe on most cars). These last 2 are rare failures.

I also had a car that would not kick the AC on and I traced that to dirty/corroded pins on PCM connector. Just unseating the connector and re-seating it a few times plus spraying some contact cleaner on the contacts is all it took.
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