Question about 2004 GMC Sierra

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2005 GMC Sierra Denali - Installed new battery; driver a/c hot

Immediately after I replaced my battery, the drivers side starting blowing extremely hot air, while the passenger side continued blowing cold air.

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Need to go to dealer to have HVAC module reprogramed. whenever diconnecting battery power on these vehicles you can connect a 9 volt battery between neg and pos to keep the memory in the computers. I am an master ase technician and 5 classes from gm world class tech.

Posted on Jul 31, 2010

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Posted on Jan 02, 2017

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1 Answer

Replaced the battery on a GMC Sierra 2005. Turned AC on, it cooled for about a minute and started blowing hot air on the driver side, the passenger side blows cold. What does replacing the battery have to...


you have taken the calibration out of sink. you will now have to remove battery power again for about 5 minutes. after this time reconnect the battery. then turn key to on position for 3 minutes but do not touch the heater control or temperature controls. This should allow the heater and ac system to recalibrate. once the 3 minutes is up turn key off and then back on and start truck.. Try your controls again and see what happens. if no change then dealer will have to reprogram the heater control calibration for you.

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I have Gmc Sierra 2005 and I disconnected battery and now the a/c is blowing hot. It stars out cool but goes hot. Today when I started it the driver's side is cool but passenger side is hot now. This is...


Had the same problem. It's the memory that's reversed. If you turn the heater on it will blow cold. Problem resolves itself after you crank the engine, turn off the ignition for a few seconds and then recrank.

Aug 04, 2010 | 2005 GMC Sierra

1 Answer

2005 gmc sierra 2500hd heated seat turns off


you have a couple of problems first of all your drivers sd=ide heated heat pad is probably faulty, for your heating problem you may have to get the hvac doors recalibrated.

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2005 yukon denali, a/c worked fine until battery died


Get the climate control computer relaced or reprogrammed. There is a good chance that when your vehicle was jump started it fried the climate system.

Jul 05, 2009 | 2004 GMC Sierra

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The actuator has gone bad. They can be programed, and reset, but usaly they are bad, and that will only patch the problem for a while.

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My wife had same problem in 2005 yukon. Turn both temperture controls on dash all the way as warm as they will go, Wait about 1 or 2 mins and turn back to coolest setting. Cleared our problem right up. Do this with car running and air on.

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you need to have the actuators reset you can try unhooking battery again if not it will have to be done by the dealer

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