07 chevy suburban. when you turn off vehicle sometimes rear air conditioner compressor turns on and runs by it self.
Are you sure it is the air compressor? My Buick and Pontiac has a compressor that runs the air to the shocks/ leveling system on the GM vehicles if it is so equipped. It wiill run a few short minutes after turning off the vehicle. The air conditioning compressor is on the engine of your vehicle. There are fans in the rear that pushes out the cool air when the A/C is on.
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