I have a Glacier Bay Mark II system installed which has a refrigerator, freezer and air conditioner that run from the same compressor with logic control circuits. The freezer and refrigerator are working correctly and have been running for two years, but the air conditioner does not get very cold and barely works. I suspect the crankcase pressure valve, which is really the only component that is unique to the AC (solenoid is working). The CPR valve is supposed to be adjusted such that the Mark II compressor is running at 41 amps. This was adjusted upon initial installation, but the AC was not used for some time. Tried to use the AC recently and tested the current draw at 35 amps. I attempted to adjust the CPR valve and there was no change in the compressor amp draw over a wide range of adjustment. It seems that the CPR valve is stuck in a position that is limiting the AC.
My question is where do I go from here with diagnostics? Is it likely the CPR or is there anything else that I should be looking at? Is there any way to free up a stuck CPR? Do I need to replace the CPR? If so it looks like Rparts does not carry it. Does anyone know the specs for the correctt CPR if I need to look for it? Any ideas would be welcome.