Have 97 SL-320 with an odd A/C problem. The compressor never shuts off, runs until the unit freezes up. I currently just turn it on and off every few minutes when its hot out. Afraid I'll wear out the A/C switch soon if i don't figure this out. I've checked the little fan above the mirrow, runs OK, don't know if the thermister is ok or not..Any suggestion appreciated..

Ron