I am having a problem with my compressor. I purchased this car a yeay ago and have not used it much When I first got it the air worked for a bit maybe 30 min, the compressor went out, so I replaced it with a rebuilt, I started the car and hit the a/c switch and the clutch engaged, and there is oil in the compressor. So I pulled it down and let it hold down for an hour. I then had it recharged with R12. It blowes cold but the clutch does not cycle off even with the a/c off. That could of been the cause of the first compressor going south. What next? could it be a pressure switch ? Any Ideas ? The only way to shut it down is to unplug it. Thanks Ed