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To replace the air ride compressor on a 1999 Cadillac DeVille Concours remove the air shocks located under each wheel and replace it.
Does the "Service Stability System" message come up? If so, you probably have a leak in one of the shocks. Warning, the 99 Seville STS has electronically controlled suspension and leveling, the rear shocks and front struts are very expensive to replace.
The air compressor for the shocks is located under a plastic shield on the left side of the car in the front bolted on to the frame
Bad compressor? Blown fuse? Broken air line?
Not if they are struts - need a spring compressor
Yes, and you might want to do that if you air compressor is not working anymore. If the compressor is working, I would suggest continuing to use the air-shocks since you get the benefit of a load adjusted ride. I have used both Monroe and OEM AC Delco shocks, and they both work well. If you go with non-air shocks, make sure you disable the air compressor by pulling the fuse, etc. Otherwise the compressor may just keep running.
you will hear it run
change the front shocks
The 4Runner doesn't have struts; it has coil-over shocks in front. After removing the old shocks a spring compressor is required to remove the springs and install them on the new shocks. Take it to a front end shop that has the proper compressor and tools; it's very dangerous if you don't have good equipment and experience. The rear shocks are easy to replace by yourself.
the rear shocks on the newer Envoys are air shocks, and wear just like the other ones, however there is also a compressor in the system that is prone to failure.
In the trunk or passenger compartment
you cant change the front shocks on the trailblazer without a spring compressor because on a trailblazer they all have struts and they have to be compressed down