Compressor clutches run off of "Rules of Engagement". Check if you're getting power at pin 1 on the compressor. If yes, make sure there isn't also power on pin 2. If there is, then you have a bad ground. If you aren't getting power to it, it could be a number or things. First thing is to check if the relay is clicking when you turn the AC on. What I would then do, is check the continuity of wire C3, which is the one going to pin one and should be dark blue and yellow. You need to disconnect the bulkhead connector. Wire C3 should be pin 15 on that. Run a continuity check by placing a probe there and back on pin 1 of the clutch connector. You can do the same for the other side of the bulkhead connector and check continuity for wire C3 from there to the PDC. Place a probe at the connector. Go to the PDC and remove the AC relay and see where pin 87 goes in and that's your C3 wire. If there's continuity, you can then check that same are for power. Check power at pin 30 of that relay. If there's no power, then you have to look at those rules of engagement. That could be anything from bad sensors to refrigerant pressure. I use a template at work on our computer that will let me see what all of those sensors are seeing and doing, so I probably can't be much help in the shade tree mechanic area of how to test those without a $20k computer diag subscription.
