Question about GMC Envoy

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Need to have an actuator and/or module replaced on our 2003 Envoy. can i do it myself?

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  • bspringman Jul 23, 2009

    enables A/C to flow through front dashboard

  • yadayada
    yadayada May 11, 2010

    AH! LIKE WHAT DOES THIS DO????

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No you need to contact the service center

Posted on Jul 23, 2009

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Go to the autozone website at autozone.com and register your vehicle. It's free and you will have access to a full online repair manual for your vehicle. You can look at the procedures for making whatever repair you need to make and decide for yourself if it is a job that you feel comfortable tackling. Sure hope this helps and best wishes.

Posted on Jul 23, 2009

  • Bruce Canfield
    Bruce Canfield Jul 23, 2009

    Sir/maam: Only you know what your mechanical capablities are and it would be presumptuous for me to guess. If there is any doubt in your mind that you should try the repair yourself, the get a qualified repairman to do it. You don't want to create a more serious problem while trying to remedy a simpler one. Just my advice . Hope it helps.

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Posted on Jan 02, 2017

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1 Answer

Looking for a diagram of heater control valve vacuum lines on a 2003 GMC Envoy with a 5.3 engine


There are no vacuum lines for the HVAC , electroniclly controlled .

Mode Actuator
The mode actuator is an electronic stepper motor with feedback potentiometers. The HVAC control module sends signals to the mode door actuator through the mode door control circuit. Zero volts drives the actuator in one direction while 5-volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, the actuator rotation stops. A 5-volt reference signal is sent out over the 5-volt reference circuit to the mode actuator. When you select a desired mode setting, logic determines the value of the mode actuator signals. The HVAC control module's software uses this reference voltage in order to determine the position of the mode actuator through the mode door position signal circuit. The motor moves the mode door to the desired position.

Defrost Actuator
The defrost actuator operates the same as the mode actuator. The HVAC control module sends signals to the mode door actuator through the defrost door control circuit. Zero volts drives the actuator in one direction while 5-volts moves the actuator in the opposite direction. When the actuator receives 2.5 volts, the actuator rotation stops. A 5-volt reference signal is sent out over the 5-volt reference circuit to the defrost actuator. When you select a defrost setting, logic determines the value of the defrost actuator signals. The HVAC control module's software uses this reference voltage in order to determine the position of the mode actuator through the defrost door position signal circuit. The motor moves the defrost door to the desired position.

Feb 24, 2017 | GMC Cars & Trucks

1 Answer

Reset service indicator


When the 4WD Service light comes on it means that the Transfer Case Control Module (TCCM) has not received the proper feedback from the two actuators that control the 4WD engagement. The system needs to be diagnosed by a technician.

Apr 06, 2014 | 2003 GMC Envoy Xl

1 Answer

Right & left rear doors do not lock with remote or door lock switch.All doors unlock from remote & switch,& front lock w/remote & switch. I replaced both electric actuators & lubed mechanism but still rear...


Sounds like your door module is the issue. You can try to disconnect the battery for 5-10 minutes then retry or GMC to see if there is a recall.

Oct 15, 2013 | 2003 GMC Envoy

1 Answer

I have a 2003 GMC Envoy. AC blowing cold, just not out front vents


Yep, when you put the new battery in, it blew your actuators, PIA job, but can be done. You can TRY disconnecting battery again, but I'm betting your actuators just blew. Very common problem with our platform, poor design.

May 17, 2017 | 2003 GMC Envoy

1 Answer

How do i replace a heater control valve on a 2004 gmc envoy



Removal & Installation

Blazer, Jimmy, Xtreme & Bravada
The mode actuator is located on the top left side of the HVAC module.

  1. Disconnect the negative battery cable.
  2. Remove the knee bolster.
  3. Remove the right side driver knee bolster bracket from the steering column bracket and the intermediate bracket.
  4. Disconnect the vacuum connectors from the mode actuator.
  5. Remove the actuator rod retaining clip.
  6. Remove the actuator rod from the mode door lever.
  7. Firmly pull on the mode actuator in order to remove the actuator from the HVAC module.

    Is this what you were looking for0996b43f80205715.jpg

Feb 17, 2012 | GMC Envoy XL Cars & Trucks

1 Answer

Replace heater door actuator gmc envoy 2003


More than likely stepper motor that operates door is defective. Try tapping on module that controls the door. Dash control may be defective you need a DVM to check electrical power at these outlets, do not use 12 volt test light.

DVM: Digital Volt Meter

Dec 23, 2011 | 2003 GMC Envoy

1 Answer

2003 Envoy XL Rythmic tapping noise coming from right rear fender well area. starts tapping when you turn on the ignition (motor warm) and will last for about 90 seconds then stop


That is one of the mode actuators for the rear HVAC system, it is probably on its way out. Below is a diagram of the system, with actuators highlighted.


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Oct 06, 2011 | 2003 GMC Envoy Xl

1 Answer

I have a 2003 Envoy 4wd switch light not on 4wd not working. is it just a fuse to replace? wah tcould I do before I take it and have anything replace that would cost me less to do it myself, if it is easy.


First check the following fuses; in the underhood fuse panel, fuse #8 and #22. In the rear fuse panel fuse #48.
If fuses are OK, with key set to RUN position (don't need to start), set 4WD switch from 2WD to AFWD and listen for two motor sounds from under the truck. If you don't hear this, the problem is with the Transfer Case Control Module (TCCM) or the TC mode actuator.

Sep 19, 2011 | 2006 GMC Envoy

1 Answer

I have 2003 gmc envoy my front ac control does not


Need to check to see if the blower motor is running.If it is,but not threw the vents,most likely a vent door actuator motor.The actuator motor in this case would be bad,it is hard to get to,unless you are mechanically inclined,You can do it your self.If the blower motor is bad,just replace it.Check fuses first,and the blower relay.If I can help,let me know.

Aug 29, 2009 | 2003 GMC Envoy Xl

2 Answers

Front vents don't want to blow air - new battery


Changing the blower motor resistor will solve the problem of the unchanging fan speeds and the blower motor having power when the ignition is turned to the off position. Beware that there are three different kinds of blower motor resistors. There is a manual, automatic, and a digital that in appearance is greatly different from the first two. The blower motor resistor is located on the passenger side below and behind the glove box. The kick-plate under the glove box will need to be removed by two screws and wha-la, behold is the motor and resistor.

Sep 27, 2008 | 2003 GMC Envoy

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