Re: 92 Buick Regal Air Conditioning

My 92 Buick Regal Air Conditioning is not working. Specifically, the A/C

> relay is not getting a signal to turn on the relay, which energizes the > compressor clutch. The compressor and clutch are working fine - when I > remove the relay and jumper across the pins for the relay contacts, the > clutch engages, and the A/C works. > > I see on the wiring diagram that the A/C relay is supposed to get its signal > from pin 7 of the ECV, so I would like to measure directly on pin 7 of the > ECV - but where the heck is the ECV, and how do I tell which is pin 7? > > Also, what signals are given to the ECV to have it determine the A/C relay > signal, i.e. whether to engage the compressor clutch? Are there sensors > somewhere that should be checked? > > thanks. >

Before you get all carried away checking the ECM make sure the A/C is fully charged. If the ECM detects a low charge (fast compressor cycling) it will shut down the A/C until the codes are cleared. If you suspect this just disconnect the battery ground for a couple minutes and see if the compressor starts working. Bob

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Bob
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