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Re: A/C problem on 07 GMC
I'm assuming it's an 07 classic. Its most likely the temp control actuator. If its the drivers side it's on the bottom of the AC case under the insulator panel. Quick fix that sometimes works permanently is to recalibrate the AC controller by removing the HVAC/ECAS for 30 seconds with the ignition off, reinstall the fuse, then start the truck and allow it to run for a minute without touching A/C controls. If it doesn't recalibrate and gets stuck in hot you'll need a new temp door actuator.
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