Greetings. I have a 2011 HHR with AC issues and I need some help or suggestions. It quit blowing cold and I checked the low-pressure line and it was around 37lbs, the high side read close to the same number. The first thing I did was to change out the expansion valve, vac and refill the system and still no cold air. Feeling the lines neither one was cold and was ambient temperature. I felt like there was no flow so I changed out the compressor, vac and filled, still no cold air. The original compressor ran when I first started diagnostics and I noticed the new one was not running so checking the relays, fuses, diode, controls inside the car and finding nothing shorted or blown I got out the OEM meter and flew into action. Testing the relay and diode both were good. AC fuse is good and getting power. I checked continuity in the wiring between the fuse and the compressor and it was good but not getting power. I jumped the compressor connector with an auxiliary 12-volt source and the compressor clutch engaged. I started the engine, with the compressor engaged but there was no cold air as I would have expected, the AC lines remained warm. I checked continuity through the wire from the AC connector that I assume goes back to the BCM for the call for AC signal and calling for AC there was none. I really need a schematic for this system if anyone has one or any idea what I have going. The vehicle has 178000 miles but is in pristine shape for a 13-year-old car. I live in Texas and really need AC for this 100+ degree heat.
Thanks in advance for any help you may have.

 

Pressure switch.

 

Sure seems so, FMG .

 

That is going to be my next step. Thanks

 

There is a link in my sig to free service manuals, schematics included.

 

Thanks!!!!!!!!

 

Shall we assume that the blower is turned on?

 

When you refilled, did you put in the required amount (and oil), or just what you had vacuumed out?

 

I have replaced the compressor, pressure switch and the thermal expansion valve. I can not find anything wrong electrical. Should I start looking for a BCM?

 

What is the state of the engine coolant temperature? Any CEL/codes?
You didn't answer about the blower.
Have you checked the button on the dash?
Does the blower switch send the signal to the BCM?
Does the blower run at all 4 speeds?
Are the mode and level switches in the correct setting?
Check continuity of wires?