Question about 2002 GMC Sierra

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Vent blowing hot air on one side of the truck.

I have a 2004 GMC truck that when you turn the vent or the a/c on it blows hot air on the passenger side of the truck. Can you please tell me a fix for this problem?

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  • Anonymous Jan 22, 2009

    Hot air blows on the drivers side. If I turn the engine off and restart the truck it is ok.

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  • 155 Answers

There is, I think, a TSB on this condition that says the temp control door inside the dash air box warps over time and causes it

Posted on Oct 26, 2008

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2 Answers

2004 2500 6.0 Silverado ac blows HOT on alternate sides of vehicle while in Auto A/C mode.


Douglass, Your A/C may have lost it's programming, blend door actuator could be faulty or A/C could be low on refrigerant. You may have to take in and have a good Tech. diagnose and estimate repair.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Dual climate controls drivers side hot passengers side cold have 2004...
hot on driver side
Drivers side vents will blow hot air while is turned on but passenger side...

Jul 26, 2016 | 2004 Chevrolet Silverado 2500HD

1 Answer

When the ac is on the driver side vent blow only hot air and the passenger vent blow the cold ac air


Usually a sign of low freon or a blend door problem. If the system is full of freon, I would check the blend doors under the dash.

Aug 13, 2012 | 1994 GMC Sierra

1 Answer

Air/C, blows hot air on drivers and cold air on passenger side?


The vent actuator my need to be reset, this can be done by removing the HVAC fuse from the fuse panel for 5 min or disconnecting the battery. If the vent actuator does not correct it self, then it's most like going to have to be replace due to internal parts have broke in the actuator.
Thank you for using fixya and it's common for the vent actuators to go bad after a few years, the internal parts are made of plastic and get brittle after time.

May 10, 2010 | 2004 Hummer H2

1 Answer

Blowing hot


something fell down defrost vent

Jul 26, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

Driver side vent is blowing out hot air,passenger side is blows out cool air


Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.

Jun 01, 2009 | 2004 Isuzu Ascender

1 Answer

Fully warmed up; blowing hot and cold; Suzuki XL-7


Its just a vent damper plate not operating, it's like a gate which controls the flow of air,,usually they are operated by vacuum, or cables.
Service center time, unless you are handy with your own repairs.

Jan 19, 2009 | 2004 Suzuki Verona

1 Answer

Air now blowing from the vent on driver side


maybe the vent piping came loose under the dash or something? it could happen and youd get the effect you are getting

Jan 12, 2009 | 2006 GMC Envoy

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