What sometimes happen is the wire going to the magnet clutch rubs through. Also- check the pressure sensor- when the sensor notices either a high or a low pressure, it disables the AC. Also check the AC switch- sometimes it's just a little contact issue. When the compressor is not locked up, the clutch works and the system is filled, there is not much to it.
Opinions are like buttholes- everybody has one. :smileup: