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Old 06-13-2017, 08:58 PM   #1
Blue Tank
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One side of A/C blows hot

This is the perfect compliment to the drivers seat heater that works unless it's really cold out.
'04 burb with the automatic climate control and good readings on the high and low side. Last year when it was really hot out the drivers side upper vents would go in to super hot mode occasionally. Typically this would happen on a very hot day, 85-90+. This year it's much more common and happens while the pass and rear vents blow cold. If you turn the hvac control off and then back on in a minute it will go hot again. If you come to a stop and turn the truck off and then fire it right back up it will normally blow cold for a while. I'm thinking it's probably one of the inside temp sensors, upper or lower, but wanted to see if somebody ran in to this before.
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Old Today, 01:28 AM   #2
edhtrd71
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Re: One side of A/C blows hot

Hey, it's super common for those act temp actuators to go bad. The driver side is the easier one to replace. It is mounted on the underside of the dash very close to the middle. Takes a few 5.5mm bolts to remove. Btw when you buy a new one don't go plugging in the new one without it being mounted to test it out. They have to learn their stops the first time they are plugged in. I have seen guys grab one after another from the parts department because they kept plugging them in before mounting them. They would watch them work one time over and over. Super easy job.
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Old Today, 07:08 AM   #3
greasemonkey
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Re: One side of A/C blows hot

There is also a relearn procedure for the actuators, opinions seem to differ slightly on how to do it so you may want to do some research on it. If you don't have the calibration tool you can do it by pulling the battery cable or the HVAC fuse under hood for a bit. Reconnect everything, turn truck on and let the AC calibrate itself. With the automatic AC you shouldn't have to worry about the settings, it should default to 75 degrees when plugged back in.
I have had terrible luck with ACDelco actuators. I bought a Dorman the last time the ACDelco actuator started buzzing but haven't installed it yet so I can't say anything for the quality difference.
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Old Today, 07:11 AM   #4
greasemonkey
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Re: One side of A/C blows hot

I should add that you can try the relearn procedure before buying a new actuator; but in my case, all it did was make the actuator go full hot and I ended up buying a new one anyway.
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