2002 Cadillac Escalade

There are many possibilities that can cause that message. The fact that the message occurs, means there is a code(s) stored in the VSES system. The only way to extract these codes is with a scan tool. If you can obtain the code(s), I can offer some direction. The fact that the compressor don't come on when you start the vehicle may or may not relate. If you load the vehicle, does the compressor come on. If it doesn't then there is a problem.

thanks for your quick reply gstacey
to answer back no even when i load the escalade down it does not come on.
I recently had my truk checked at a local shop, to my surprise the vehicle did not have a stored code
strange i thought but my light still is showing