if it is charged up correctly, check the dual/triple pressure switch, it sits on the low side (the fatter ac pipe) and it usually screws into the receiver dryer/accumulator. basically get a test light and see if it is completing the circuit. typically when you're probing the switch the test light gives it enough ground to kick the compressor on just while you're testing the thing. basically when the head pressure is too great it shuts off the ac relay by breaking the circuit, and when working properly it completes the circuit, thus switching the ac relay and kicking the condensor fan on ^_^ oooOOoo BUKAKE!! @@