When I am decelerating or at a red light, my semi-cool a/c suddenly goes to the HOT mode. I don't know if it is the monovalve or something else. No fuses blown. The a/c compressor is old and weak (bad electric clutch) but is still working when the air goes from cool to HOT (the clutch is engaged, not stopped). If any of you folks think this is a monovalve problem, do the rebuild kits work? Could it be something else wrong I should look at? Thanks for any help!