im pretty sure the clutch is failing on my a/c compressor, because it ALWAYS works when i just start the car and most of the time on the highway, but in the stop & go of the city it sometimes blows warm air... but any other time the a/c is ICE cold! pressures are good, fan are running -i can hear them (if i listen closely) in traffic-. so my question is how hard is it to change the clutch? i am a diesel mechanic, so im not worried about the nuts and bolts of it, im more conserned about if the old one will come off the shaft or not? i'd like to just replace the clutch because i dont want to open a good working system! $$ too!