having trouble with my SUV listed above gmt400 with rear air. My A/C compressor won't cycle when the button on the controller is pushed. Nor does the A/C button light up. So far I've replaced compressor, condenser, accumulator, orifice tube, high pressure switch, low pressure switch, cycling switch. Replaced the controller head unit with 3 junkyard units. Even broke down and bought a brand new HVAC controller. Still no A/C or re-circulation lights work and no a/c compressor function. When buttons are pressed i can hear the actuators moving around but no light signifying the buttons were pressed. Also the compressor will only function when jumped at the relay. It won't cycle when jumped at any of the pressure switches or cycling switch. System was charged to factory specifications. Also used pag 150 compressor oil
Jul 15, 2020 at 6:57 AM
