2003 Yukon Denali I just replaced my climate control module because my original was acting up when trying to change the temperature. I got the Dorman from the auto parts store today. Now when I turn my ac on the compressor won't engage. I know that I've got a charge, I've checked it with a manifold gauge and it was working before I changed to the new unit. Any ideas what's going on? I've tried removing the HVAC fuse to reset but that didn't work. I'm planning on calling Dorman tech support but they're not open until Monday. Any ideas would be greatly appreciated.