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Go to Public Library and request GM Electrical Shop Manual for 1991 Park Avenue -- librarian will help you locate it. Has complete diagrams and dianostics. Might want to check Fuses #12 (20 amp) and #7 (25 amp) Too involved for detailed explanation, but there are 3 components: the compressor, the load sensor (at right rear spring), and a relay (in the RELAY_CONTROL_CENTER (behind the glove box). The YELLOW wire from the sensor pulls the relay which applies power to the compressor thru the BLK/LT GRN wire at the compressor's connector. The BLK wire at the compressor's connector is the GRD., the BLK/PPL is always HOT (thru fuse 12), and the WHT wire (when grounded) releases the pressure in the system.

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Q: Where can you find a wiring diagram for the rear leveling system in a 91 Park Avenue?
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