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Re: 1991 Buick Park Ave.
Check to see if the sensor link/arm as still attatched in the rear of the car. it has a little plastic ball end on each end and the ball can rust and fall off so the pump stays running. you can unplug the compressor to stop the dead battery condition for now. there is some diagnosis involved in repairing it though.
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most obvious cause could be the alternator ,one of the diodes has gone draining the battery or the battery itself its difficult to know without checking it out .Try disconnecting the battery and if it still goes flat then you know its a faulty cell in the battery .if it doesnt then try disconnecting the big thick cable on the alternator and see if that stops it
That's the elc compressor (electronic level control) you have a leak in your air system somewhere and its trying to maintain the proper ride height. this compressor is wired to run even with the engine off,if is runs excessively you may have to unplug the wiring connector at the unit ,or find and fix the air leak
After all said and done regarding the problem with your car AC,it can be deduced that the problem is from the expansion valve in the system,it's bad and needs a replacement,
However,before replacing the exp valve,carry out this solution;
try disconnecting the negative battery cable, then hook it back up and start the engine to see if the compressor will run momentarily. If it is indeed low on refrigerant, you can add some while the compressor is running.If the compressor doesn't work,then proceed with the replacement of the expansion valve. Good luck!!
Check to make sure that you have enought freon to engage the compressor, then you will need a flow chart to take you through the rest of the steps necessary to diagnos this problem. The Electrical system manual for Buick is the only one that will have the proper information for you to walk through the steps to dead head it. There is a HVAC programer that is behind the floor heater duck work. It has a numbering system that goes from (2) rows of pins that go 1-16 for terminals.On terminal 5-7 with ignition in run position, you need bat. votage. Terminal 10 & 11 you need 4-5 volts. Neither 10 or 11 should be unplugged just yet since 10 feeds 11 pin. If there isn't any voltage at these pins, check for corrosion on the pins theirself, or for the pin that it may have slipped back out of the connector. Good luck.