Hey Scotty! Haven't asked a question in about 4 years now. I purchased a 2012 Chevy Suburban 1500 about 2 years ago. Ac stopped blowing cold air. It has a new compressor (not engaging), new condenser, new evaporator. Took it to a shop to get charged. They said compressor wasn't engaging. They ran a diagnostic and said the Climate Control module had to be replaced. Bought one and put it in (simple plug and play), compressor is STILL not engaging. What's next?
Thanks Scotty! Can't believe you're at 4 million followers now {black}:laughingoutloud:
You didn't say if you want to try to diagnose this issue yourself using A/C gauges and a multimeter.
You also didn't say if you checked the fuses and relay in your engine compartment fuse box.
You have 3 relevant fuses in there. One is the A/C compressor clutch fuse, 1 is the HVAC Batt fuse, 1 is the HVAC-IGN fuse.
You also have the A/C Clutch relay.
Don't just look at the fuses. Pull them out and look at their sockets for evidence of damage from overheating or corrosion.
Swap out that relay with another one that isn't "high priority" (maybe like a fog lamp relay or a rear defrost relay)
If all those are good, you'd start chasing this down like any other circuit. Begin at the "load" which in this case is your compressor clutch.
Pull off the connector and jump power and ground to the connectors. (Engine Off). Does the compressor clutch "click" and pull in slightly?
If it does, you know, IF provided power and ground it will work. So you'd then test the voltage and ground at the connector (disconnect the connector from the compressor with the truck running, A/C controls turned on).
See which is missing. Power or Ground.
Then just work your way back through the circuit.
Don't let anybody tell you to "jump" the pressure switch connectors. You can test those switches and their connectors using a multimeter without risk to your compressor.
Don't "jump" the relay sockets without manifold gauges connected to the system.
You may get the compressor clutch to engage, but if the system is low (or empty) the compressor oil can't cirrculate through the system and you'll chew up that new compressor real quick.
