The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - a/c symptoms, need help diagnosing issues

lucky_7 · 06-14-2018, 02:57 PM

So I took apart the dash yesterday to see if the control might be bad. I had the truck running, ac on, and when I moved the connector the compressor kicked on. So I pushed it back in and the compressor kicked off. I did this a few more times to confirm, so now it definitely seems like my control is the problem. Ill get a new one and update when its installed.

FYI, the switch on the bottom of the compressor on the back is the high side switch, the one on the top is the cycling switch. We got a wiring diagram from gm and check the power at the switches to trace what was not getting power. It was the highside switch not receiving power from the control (A/C) button. That was led me to check the control.

06-14-2018, 02:57 PM	#7
lucky_7 Registered User Join Date: Mar 2013 Location: Muskogee, Ok. Posts: 123	Re: a/c symptoms, need help diagnosing issues So I took apart the dash yesterday to see if the control might be bad. I had the truck running, ac on, and when I moved the connector the compressor kicked on. So I pushed it back in and the compressor kicked off. I did this a few more times to confirm, so now it definitely seems like my control is the problem. Ill get a new one and update when its installed. FYI, the switch on the bottom of the compressor on the back is the high side switch, the one on the top is the cycling switch. We got a wiring diagram from gm and check the power at the switches to trace what was not getting power. It was the highside switch not receiving power from the control (A/C) button. That was led me to check the control.