GWFallguyTX

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.

firemangeorge

Pressure switch.

Oldblue

Sure seems so, FMG .

GWFallguyTX

That is going to be my next step. Thanks

donbrew

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

GWFallguyTX

Thanks!!!!!!!!

donbrew

Shall we assume that the blower is turned on?

RJ_RS_SS_350

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

GWFallguyTX

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?

donbrew

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?