2014 Denali AC problems
Ive got a 2014 Denali LML and last week the AC quit and I started digging but cant find what the problem is.
I stated by checking the compressor, it was no engaging. Freon is full, fuses are good, swapped in a new HVAC control unit, new pressure sensor with no luck. I had another LML over and we ran thru some fuses and wires are the compressor. I found out that I have a ground at compressor plug, but no signal from the 12v to engage the compressor. I then went to the fuse, the ground it ran thru the fuse and it has no ground at the fuse. I grounded out the fuse and nothing, but I can pull the plug from the compressor and run a 12v and ground from the battery and it will engage and compressor and work fine. I don't know if I am looking for the fuse not being ground of if I should trace the 12v from the compressor wire to find the problem there.
I think it would be really helpful to have a wiring diagram of the truck or just the AC system.
What do you recommend testing or trying?