Anyone owns a 2003 SL500 with the working AC and don’t mind to help me verify a few things with the AC compressor clutch functioning and reply to this thread would be appreciated. Thanks, --Hung

1) With the engine off see if you can spin the AC compressor clutch (the middle plate in the middle of the AC compressor pulley) by hand.

2) With the engine running and the auto climate control “AC off” switch is activated (the “AC off “ red lamp is on), verify (watch) if the AC compressor clutch is engaged (spinning with the pulley) or not.