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Cold air at passenger side; hot air at driver side 2004 GMC Sierra

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Remove plastic cover that fits under glove box

Posted on Sep 02, 2010

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Posted on Jan 02, 2017

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20005 gmc sierra hot on driver side


I had this happen on my 2004 also. I have the climate zone control module that allows for adjustment for driver or passenger temps. I had to cycle between hot and cold on the passenger side and switch it between defrost and feet, then power off everything for a long period of time using the power button on the control, this finally got the solenoid to become unstuck. If that doesn't work then you have to get into the heater/air ducts under passenger side, which is difficult, to manually unstick or replace the locked solenoid.

Sep 27, 2014 | 2000 GMC Sierra

1 Answer

Passenger A/C blowing hot air in a 2004 GMC Sierra SLT.


Usually when one side is hot and the other is cold, and each side is controlled separately, the problem is a blend door not working.
The blend doors are usually controlled by small electric motors.
You might research "blend door" online and see if anything pops up.

Jun 26, 2012 | 2004 GMC Sierra

1 Answer

No heat of drivers side blows cold air while passengers side works blows hot air just fine


Replace the door blend actuator behind glove box, approx $150 for part, Everyone I know with dual control on the silverado's have this problem.

Dec 27, 2010 | 2004 GMC Sierra

1 Answer

My 2004 GMC sierra blows hot air out the drivers side and cold air out the passenger side. I replaced both door actuators, one on floor in the center of the truck the other under the dash near the drivers...


If you've replaced the actuators and they are working.
One of the blend doors may be broken inside the heater box. To repair or replace the broken door you
have to remove the heater box. This is not a small job. The book gives 6-7 hours for the job. There is a
cheat that I've heard good things about. I guess it can
be done in a fraction of the time. You can find out
about it at heatertreater.net I have not used it myself
but I know somone who has. And it worked well for
him. Hope this helps.

Mar 29, 2010 | 2004 GMC Sierra

2 Answers

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


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.

Jul 15, 2009 | 2004 GMC Sierra

1 Answer

Blows hot and cold-restart and problem disappears for a while


you need a servicing of the ac condensor, also check that the blower is working or not. your problem will be solved by servicing the condensor.

Jun 20, 2009 | 2004 GMC Sierra

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