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2007 Buick Lucerne - Self-leveling shocks not working

The compressor runs for about 5 seconds when the car is started. It also runs for a long time when I put something in the trunk. I took the left rear tire off, disconnected the sensor link and raised the sensor arm. The compressor runs but the shocks do not raise.

You have a leak. Airline or lift air bags on the shocks.

If you raise the sensor arm it tells the system to run the compressor to lift the rear. If you don’t want to fix it, pull the fuse and repalce the rear airshocks with standard somthe bags don’t bunch up and get pinched. That can lock up the suspension.