Replaced compressor on 1997 deville get service ac compressor off message how do you reset computer so compressor will turn on?

disconnect the battery for 45 seconds . That will reset the system and allow the AUTO to light up and receive new gas. Once the refrigerant level is correct, that particular light should turn off, and the a/c system should begin to work properly. If not, you can always use a scanner from Autozone, Dicount, or O'Reilly's Auto parts to try to fix it. Hope that helps! Avoid system sealers and leak stop. These products are band-aids, not repairs. Leak sealers react with air. If there is air in the system, the leak stop will congeal into a thick green jelly. www.acpartshouse.com