Question about 2004 GMC Envoy

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What does a body control module controy 2004 gmc envoy

Its blowing hot on one side and cold on other and actuators have been changed. blowers are not blowing insink with controler. please help

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Look for the body control module under the drivers seat. It controls most of everything that happens in the car,

Posted on Jul 24, 2016


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Posted on Jan 02, 2017

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SOURCE: The air conditioner on the

its the actuators,take to shop tell them to replace.

Posted on Jul 27, 2008

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SOURCE: veh wont start

by looking at the wiring diagram for your truck. the pcm1 fuse only feeds the pcm so most likely it is a grounded wire between the fuse block and pcm. follow the wire harness closely between the two and see if its grounded somewhere. also try disconnecting the pcm and see if the fuse still blows. that would isolate the problem to the wiring. it is highly unlikely that the pcm would cause the problem.

Posted on Nov 27, 2008

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SOURCE: my air blows hot even tho my climate control is on cold

U have a stuck air temp control blend door, either the actuator motor is defective or the door is warped and has jammed, one thing is that u must remove the dash to rcheck replace these parts.

Posted on Mar 10, 2009

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SOURCE: air blend door

Replace the broken actuator.

Posted on Apr 15, 2009

  • 15 Answers


should be on the passenger side under the dash. Remove the lower dash panel and look up under the dash. you will see the blower motor and then to the left a little you will see a plug attached to a relay/resistor switch. It is held on by two screws. The Envoy is the Trailblazers sister so you may have the same issue I had. Seems like the ground is not sufficient enough causing the ground wire to get hot melting the plugs together. I had a very hard time getting them apart but did. Purchased a new relay/resistor switch and repaired the wiring myself. GM wants $100.00 bucks for the plug. Hopefully you don't have a G/F or wife like mine that thought kicking the fan speed control switch would make it work. I had to also replace that due to her breaking the switch.

Posted on Aug 16, 2009

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Nov 28, 2015 | 2004 GMC Envoy SLT

1 Answer

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

Car only blows heat on passenger side, Drivers side still cold even after replacing the actuator. What else could it be?

If the blower motor is running, that means the 30A HVAC BLOWER fuse is OK. The HVAC control module obtains power through the 10A DIC/RKE fuse in the right instrument panel junction block and the 10A A/C CRUISE fuse in the left instrument panel junction block. Output from the HVAC control module controls the mode actuator and the recirculation actuator. You replaced one of the two. The other one may be defective or the replacement one may be defective. Also, the HVAC control module may be defective and not producing door control output

Sep 30, 2012 | 2005 Chevrolet Impala

1 Answer

On my 2004 Gmc Envoy, Heat only comes out on passenger side, still blows cold air on drivers side. Defrost, floor and vents all produce air flow. Rear heater works fine. A/C works fine. Any idea?

Sounds like the driver's side temperature actuator or blend door are defective. Part of the dash needs to be removed to access these parts.

Oct 26, 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

No heat on drivers side, blowers work right just blowing cold air on the drivers side, getting heat everywhere except the drivers side has dual heat controls.

Hi, there are electric actuators that control the doors for air blend. There is a door for each side, and an actuator for each side. Most likely, the actuator is faulty. The only way to know for sure , is have the hvac system scanned, as this may be slightly costly, and electrical parts are generally not returnable. Good luck...Coop

Dec 12, 2010 | 2002 GMC Envoy

1 Answer

I have a 2004 gmc envoy and it is blowing out nothing but cold air unless you put it to where it is blowing on you then only 2 vents will blow out hot air, changed the blower motor, thermostat, I even...

It sounds as if one or more of the door actuators is not moving the blend doors. Unfortunately, it will require some disassembly of the dash.

Oct 21, 2010 | 2004 GMC Envoy

2 Answers

2004 chevy avalanche with dual control system problem

this problem is caused in almost all cases by a failed actuator that moves the door insiode the heating/ac duct to change the outlet temperature, it is called the Air Temperature Control Blend Door actuator.

Oct 05, 2009 | 2004 GMC Envoy

1 Answer

2004 Yukon. driver side air conditioner not working

you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.

Sep 19, 2009 | 2004 GMC Yukon

1 Answer

Air blend door

Replace the broken actuator.

Apr 15, 2009 | 2004 GMC Sierra

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