Hello I have a 2002 deville and I have noticed a motor like sound comming from the back of the car when I am stopped. I am guessing it is the compressor for the air ride system. It is comming on much more often and for much longer, it is to the point where the noise is annoying me. I don't notice any ride height changes but I am wondering if this is the first sign of something is gonna go? If so what am I looking at?