Question about 2003 GMC Envoy

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Replaced battery on 2004 envoy, hvac stays cold on drivers side and hot on passenger side. Took battery terminals back off and waited 10 min.s and replaced did not help.

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First set all HVAC controls to off or fully CCW positions, then disconnect battery for 10 minutes. Reconnect battery and don't touch any HVAC controls for a few minutes. If this does not work you may have a bad actuator or blend door.

Posted on Nov 28, 2010


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After disconnecting the battery the passenger side blows hot while the driver sdie blows cold. Does anybody have a answer for this problem?

Unfortunately, you have come across a common problem on these vehicle when the battery power is interrupted. One of your Temperature Control Actuators (or its associated door) has failed. Attached is a diagram of the HVAC unit and the location of the actuators 9With part numbers). Some of these actuators are difficult to get to without disassembling the dash. The Driver's side actuator can be accessed from under the dash.


Oct 01, 2012 | 2004 GMC Envoy

1 Answer

I have a 2002 gmc envoy. when starting was dragging a little...i took it to auto zone and they checked battery...said it needed a new one and installed it. alternator was checked and is fine. but...

You have two things going on that were created when the battery was replaced. First, when the battery was disconnected, the computer was reset to factory settings. Because the throttle body is probably very dirty, the idle is now unsteady. The computer had learned to compensate for the dirty throttle body. So now it is time to clean the throttle body, and make sure that the front and back sides are cleaned.
The other thing that happened when the battery was changed is that the HVAC system had to recalibrate itself. Sometimes this causes the mode control doors to stick or the mode control actuators to damage the gears for the doors. The doors could also just be stuck. You can try to have it do another recalibrate by disconnecting the battery again. But before disconnecting, set all HVAC controls and switches to their OFF or CCW positions. After reconnecting the battery, do not touch the HVAC controls for about 2 - 3 minutes. If this does not fix the HVAC, then you will need to have it repaired.

Aug 09, 2011 | 2002 GMC Envoy

1 Answer

New battery install, now cold air willnot blow on passsanger side

The HVAC system may need to go thru a recalibration. Set all HVAC controls and switches to OFF or fully CCW postions, then either disconnect battery or pull fuse #36 in the rear fuse panel. Reconnect battery or reinstall fuse #36, turn ignition key to ON position (don't need to start) and wait about 2 -3 minutes. If this does not solve problem, there is a problem with the passenger side blend door or its actuator.

Jul 14, 2011 | 2004 GMC Envoy

1 Answer

2004 GMC Envoy SLT, had to install a new battery. Prior to installation, dual air was working fine, now passenger's 2 vents are blowing hot air while dirver's side is cold. Need help

It is likely that one or more of the blend doors or their actuators are stuck. Before any repair action is done, try allowing the HVAC system to recalibrate itself. To do this, turn all HVAC controls and switches to their OFF or CCW postions, then disconnect the battery for about 10 minutes. Reconnect the battery, but do not touch any of the HVAC controls or switches for about 2 -3 minutes. If this does not cure the problem, the HVAC system will need to be diagnosed. Access to the blend doors and actuators may require some disassembly of the center dash area.

Jul 08, 2011 | 2004 GMC Envoy

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

Changed battery and now the A/C won't blow through dash vents, only the defroster vents and floor vents. Also, driver side is cold and passenger side is hot. Did not have this problem prior to battery...

Set all HVAC control to off or CCW, disconnect battery for about 10 minutes. Reconnect battery and do not touch any HVAC controls for several minutes. The system will calibrate itself at this time. If this does not fix the problem, you have one or more actuators stuck or broken.

May 04, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Heater issue, driver side of 2004 Chevy Avalanche

1. Place the ignition switch in the off position.
2. Remove the HVAC/ECAS fuse for 10 seconds or more. It's in the under hood fuse box. Put the temp in full cold.
3. Install the fuse.
5. Have any codes cleared with a scan tool.

Dec 07, 2009 | 2004 Chevrolet Avalanche

2 Answers

One side air blows cold one side blows hot

GM has a known problem with the electric actuators that operate the blend and temperature doors in the HVAC system. There are 4 or 5 of these in the typical system. Any can start sticking or binding and cause this problem. Sometimes they can be cleaned, or they might need to be replaced. Sometimes resetting the HVAC system controller by disconnecting the battery for 10 minutes, then reconnecting it, will correct the problem.

Aug 09, 2009 | 2004 Chevrolet Silverado 2500HD

1 Answer

2005 Yukon Denalli - Blow cold air out the drivers side

the passenger side electronic controller is sensing the passenger side temperature is cooler than it really is, which causes the controller to increase the hot water flow to warm up the passenger area...any time you replace a battery or loose your charge, the HVAC module will need to be reset...Try this...
Remove your hvac fuse for 10 sec - reinstall fuse. Start engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" Recalibration of module will accure when power is lost (fuse pulled, battery changed or died) If hvac reset did not work you have a trouble code - reset BCM There are two ways to reset your body control module Go to the GENERAL Remove BOTH battery cables (for the sake of CAUTION remove air bag fuse and wait 5 MINUTES) Hold both cables together for 1 minute - drains KAM (keep alive memory). Put everything back together Start the engine "DO NOT TOUCH ANYTHING FOR 3 MINUTES" If you have no broken parts - system not default (normal operation)

If that works it just saved you 600 costs to repair.

Good Luck...please rate me a fixya.

Jul 25, 2009 | 2004 GMC Sierra

1 Answer

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

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