Gilly: Thank you for the response on 1988 300 SE.
Inetermittently, when on A/C does not blow cold and I dont think clutch is engaging. When heat is on no hot air. Fan works and intermitently it also does not blow period at times, only time I noticed fan not blow was with heater and defroster on. I had a 300 D and when this occured it was a computer chip could it pssibly be same? Thanks Brian