To replace the AC compressor in a 1999 Grand Prix you must first remove the AC belt. Then disconnect the negative battery cable before removing the compressor bolts and connectors and removing compressor.
To replace the air ride compressor on a 1999 Cadillac DeVille Concours remove the air shocks located under each wheel and replace it.
http://www.a1electric.com/grandam.htm here is an excellent how to with pictures
how do you replace backup lights on 99 grand am?
YesYes
Belt driven accessory lower right side of engine
Take it to Mechanic!
Identify and remove freon. Remove the failed compressor and transfer the brackets, sensors, manifolds and switches to the replacement unit. Clean components that are not being replaced. Replace the dryer or accumulator. Install the new compressor.
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