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David Taravella Posted on Feb 19, 2018
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How to calibrate hvac module on 2004 gmc envoy only get from vents no defroster

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Jeff Armer

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  • GMC Master 15,575 Answers
  • Posted on Feb 19, 2018
Jeff Armer
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Joined: Nov 22, 2012
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Did you replace the mode door actuator ? Manual or automatic HVAC system .

When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:
Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
Place the ignition switch to the OFF position.
Disconnect the scan tool.
Install the HVAC control module.
Connect all previously disconnected components.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate.
Verify that no DTCs have set as current DTCs.
When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following:

Preferred Method (w/ Scan Tool)
Clear all DTCs.
Place the ignition switch in the OFF position.
Install the HVAC actuator.
Connect all previously disconnected components.
Start the vehicle.
With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
Verify that no DTCs have set as current DTCs.
Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
Alternate Method (w/o Scan Tool)
Clear all DTCs.
Place the ignition switch to the OFF position.
Install the HVAC actuator.
Connect all previously disconnected components.
Remove the HVAC B fuse for a minimum of 10 seconds.
Install the HVAC B fuse.
Start the vehicle.
Wait 40 seconds for the HVAC control module to self-calibrate.
Verify that no DTCs have set as current DTCs.

5 Related Answers

A

Anonymous

  • Posted on Aug 25, 2008

SOURCE: Air Vents 2003 Envoy

I have the same ploblem, I just wonder why this is not a recall yet? the other problem i got is the fuel gauge not working.

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Anonymous

  • 4669 Answers
  • Posted on Mar 12, 2009

SOURCE: 2004 GMC Envoy; Very little air flow from FRONT PANEL

Try replacing the cabin air filter.

Anonymous

  • 1 Answer
  • Posted on Jul 15, 2009

SOURCE: no a/c coming from vents, air blows from defrost and on floor

replace mode actuator

Anonymous

  • 4 Answers
  • Posted on Dec 10, 2009

SOURCE: rear windshiel wiper and rear defrost does not

Have you checked the fuses?

Freddy

  • 1311 Answers
  • Posted on Sep 09, 2010

SOURCE: my 2004 gmc envoy loses engine pressure when i

Don't know what you mean by engine losing pressure, but as far as the air not coming out of the correct vents, try the following;
Pull the HVAC-B (#36) fuse for 30 seconds (located in rear fuse panel, under seat), then put it back in. Then turn the ignition switch to RUN (no need to start the engine). Don't touch ANY controls for 90 seconds. I don't think it matters what position the controls are in, but some people think it works better if you have the HVAC system turned off. After 90 seconds, the actuators have gone through their paces, the controller has new memory data on the end stops of the rotation of each actuator, and you might be good to go

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1helpful
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I have a 2003 envoy xl. heat and ac only come out driver side defrost & left vent.No air or heat out of driver or passenger floor .Passenger vent and defrost is cool air only
Air temperature and delivery are controlled via small actuators on the heating, ventilation & air conditioning (HVAC) box located behind the dashboard. These actuators operate doors inside the HVAC box in order to channel air through different passages to achieve the desired result. A "blend" door actuator can channel air through the heater core, around the heater core or a mix of these two to achieve the desired temperature. A "mode" door actuator can direct airflow to the ducts that lead to the defrost vent, front vent, floor vent or a mix between. When a vehicle has dual climate control (where driver and passenger sides of the vehicle can have different air temperatures) there can be multiple of actuators of each type which can make diagnosis difficult. The first step would be to retrieve diagnostic trouble codes (DTCs) from the HVAC Control Module using an advanced level scan tool; these codes help determine the location of the issue and if it's an electronic or mechanical failure. Electronic failures would include items such as HVAC control module failure, actuator circuit failure or actuator failure. Mechanical failures would include items such as actuator failure or internal HVAC box door failure. You can read more here: https://www.yourmechanic.com/article/what-components-of-the-heating-and-ac-system-are-most-likely-to-fail
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2004 GMC Envoy thermostat replaced and now the dash vents are not working
When thermostat was replaced, the battery was probably disconnected and that caused the HVAC system to lose its calibration. To initiate the calibration properly, first set all HVAC controls to their OFF or CCW positions. Then disconnect the battery for about a 2 - 3 minutes, then reconnect. Do not touch any of the controls for about 2 minutes. If this does not fix the vent problem, you probably have a bad or stuck actuator, or a stuck vent door.
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Sep 01, 2012 • 2004 GMC Envoy
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Changed battery in my 2004 GMC Envoy and now my a/c only blows from the dash and rear vents. What could be wrong and where is the part located on the vehicle?
There are a couple of possibilities, one is that the HVAC system lost its calibration during the battery change or the actuator that controls the vent door has gone bad.
To recalibrate the HVAC system, set all HVAC controls and switches to OFF or fully CCW positions. Disconnect the battery for about 3 - 4 minutes, then reconnect the battery. Do not touch any of the HVAC controls for a few minutes, then try the controls to see if the air flows correctly.
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Aug 01, 2012 • 2004 GMC Envoy
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2006 GMC Envoy.. Changed the battery, and now the A/C will not blow out the front vents. Works on defrost and on the floor, and in the back. What's the deal?
the deal is that your a/c doors are now out of calibration. disconnect battery for 1 minute, hook battery back up. now turn key on, DO NOT START THE ENGINE, let it set for 2 minutes, now start engine, it should now work.
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Aug 03, 2011 • 2004 GMC Envoy
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I have a 2004 gmc envoy and we recently changed batt , and now the a/c want blow thur the front vents but blows thru the floor and defroster fineand we put a new acuator on and now it want blow thru the...
Try recalibrating the HVAC system first. Set all HVAC controls and switches to their OFF or CCW positions, then disconnect battery for a couple of minutes, reconnect battery and don't touch any of the HVAC controls for 2 - 3 minutes. If this does not correct the problem, you may have a stuck blend door or another bad actuator.
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Jul 26, 2011 • 2004 GMC Envoy
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My air blows good in my vechile but the problem is that the air won't out out of my front vents. when I put the dail on the front vent it blows out on the floor. what can I do to fix my problem. I...
Could be one of two things, HVAC needs to recalibrate itself or one of the blend doors (or its actuator) is stuck. To accomplish the recalibration, set all HVAC controls and switches to their OFF or CCW positions, pull fuses # 36 and 39 in the rear fuse panel, wait about a minute then reinstall fuses. Do not touch any of the HVAC controls for 2 -3 minutes. If this does not resolve the vent issue, you will need to have the HVAC diagnosed by a technician.
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Jul 11, 2011 • 2004 GMC Envoy
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I got a new battery put in my envoy, and now the heater only blows out the defrost and stays on hot, it won't let me regulate the temp or where the air comes out. please help. and my auto start will not...
Hi, please try a recalibration of the system as follows:
  1. Remove the HVAC B fuse (in the rear fuse block) for a minimum of 10 seconds.
  2. Install the HVAC B fuse.
  3. Start the vehicle.
  4. Wait 40 seconds for the HVAC control module to self-calibrate.
If this doesn't work, please get back to me.
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Apr 10, 2011 • 2002 GMC Envoy
1helpful
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My 2004 gmc envoy loses engine pressure when i have the air conditioner or the heater on. Also, the air conditioner will not blow out the dash vents but blows out the floor and defrost just fine. Autozone...
Don't know what you mean by engine losing pressure, but as far as the air not coming out of the correct vents, try the following;
Pull the HVAC-B (#36) fuse for 30 seconds (located in rear fuse panel, under seat), then put it back in. Then turn the ignition switch to RUN (no need to start the engine). Don't touch ANY controls for 90 seconds. I don't think it matters what position the controls are in, but some people think it works better if you have the HVAC system turned off. After 90 seconds, the actuators have gone through their paces, the controller has new memory data on the end stops of the rotation of each actuator, and you might be good to go
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Jun 06, 2010 • 2004 GMC Envoy
3helpful
3answers

2004 GMC Envoy; Very little air flow from FRONT PANEL
Try replacing the cabin air filter.
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Mar 12, 2009 • 2004 GMC Envoy
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