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