I recently bought a great running '91 S10, 4.3L, auto, A/C. The A/C (R-12) would quit blowing cold air after a few minutes, and seemed to be freezing over. If you shut it off for an hour or so it would blow cold air for a few minutes and then go back to hot air. So I took the plunge and converted to R134 this afternoon. An easy procedure, but as I stood there holding the can(engine running, A/C at max like the instructions said) I wondered why it was taking so long to empty the first can. Then I noticed that the compressor wasn't cycling. My 18 year old started fiddling around with the compressor, when he touched the clutch it suddenly cycled on. Scarred the sh** out of both of us but no harm was done. It quickly sucked the bottom out of the first can, and while I was changing cans the compressor cycled of. Got hooked up again and it didn't cycle back on for several minutes. This time he touched the clutch with a wrench (once bitten...) and it came on. After completing the 134A fill we let it run for awhile and noticed that when the compressor cycled of, it wouldn't restart unless you applied mild pressure to the clutch. Anybody got and idea what this could be? I checked the elec. connection on top, and pulled it down and cleaned and CRC'd it with no difference. Am I gonna have to rig up some kinda Rube Goldberg hammer so I can pull a string from the drivers seat and start the compressor?