This problem is with my 1984 Volvo 242. Had my a/c system completely rebuilt 2.5 years ago with new compressor, etc and has been working fine. The compressor is no longer turning on when the a/c switch is turned on. The adjustable thermostat switch on the switch was not replaced when the system was redone. Before taking this in to the Volvo mechanic, are their any obvious things to check? I did check the fuse and it was OK. Is their anything funny about this thermostat switch? Thanks in advance, Dave