Question about 2005 Chevrolet TrailBlazer

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Need to recalibrate the actuator pulling out the hvac fuse b for 10 second

Where is locate it the hvac b fuse in a 2005 trailblazer,thanks

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  • abf65 May 24, 2009

    hi,i just did it with no success,probably i need to test or replace the actuator,my question now is do i have only one actuator or more,my wife's trailblazer does not have a second rear a/c system,thanks for your cooperation.

  • abf65 May 25, 2009

    it is not locate it motor1258 in the power distribution box under the hood,but your are right BB1BUD IS LOCATED IN THE FUSE BOX UNDER THE REAR SEAT. IT IS FUSE 36.i follow the instruction but nothing happened,how can i test the actuator,thanks

  • abf65 May 25, 2009

    hi,where are they,the actuators,from where i start,how can i know they are not working,thanks

  • Mike Butler
    Mike Butler May 11, 2010

    Check in power distribution box under hood?

  • Anonymous Mar 22, 2014

    blower vents dont work

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THE HVAC B FUSE IS LOCATED IN THE FUSE BOX UNDER THE REAR SEAT. IT IS FUSE 36. CLEAR ANY CODES FIRST. REMOVE THE FUSE FOR 10 SECONDS, REINSTALL THE FUSE, START THE ENGINE, WAIT 40 SECONDS FOR THE ACTUATORS TO RECALIBRATE.

Posted on May 24, 2009

  • BB1BUD May 25, 2009

    I NEED TO KNOW IF THE HVAC CONTROL IS OF THE AUTOMATIC OR MANUAL TYPE AND WHICH ACTUATOR(S) WON'T WORK.

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1 Answer

No defrost


Did you preform recalibration after replacement ? See if this works ,if not you'll need to take it to the dealer an have it done with factory scan tool .
Alternate Method (w/o Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
  6. Install the HVAC/ECAS fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.

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Hi, please recalibrate the system as follows:
  1. Remove the HVAC B fuse 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.

Oct 15, 2011 | 2006 Chevrolet Trailblazer

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Went to start my 06 trailblazer the air was on the fan was blowing radio worked lights worked but wouldnt start went and bought new battery changed it now air wont blow threw vents only on defrost and on...


There are two possible reasons, the HVAC system needs to recalibrate itself or one of the HVAC door actuators has gone bad or is stuck.
To recalibrate the system, set all HVAC controls to their OFF or CCW positions. Disconnect the battery for a few minutes, then reconnect. Do not touch any of the HVAC controls for about 2 -3 minutes. Then see if the systems works OK.
If this does not work, the dash will need to be disassembled to access the door actuators.

Jul 28, 2011 | 2006 Chevrolet Trailblazer

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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.

Jul 11, 2011 | 2004 GMC Envoy

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You probably need recalibration of the HVAC controls. Disconnecting the battery will force it into a recalibration. Unfortunately that could be part of the problem. The recalibration tends to stick these actuators and a new actuator will be needed. I have disassembled the actuators before and rotated the gears until I hit a good spot when a part has not been available due to the time of day or day of the week. If you recently replaced your battery, or have had a dead battery, then had this problem, then you know what it is.
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Jun 30, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

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try this,
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC B fuse for a minimum of 10 seconds.
  6. Install the HVAC B fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.

Nov 11, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Changed battery and now the dash vents don't work


One of two things has happened, one or more of the HVAC actuators has failed or the HVAC recalibration of the actuators when the battery was connected failed. To recalibrate the HVAC actuators do the following;
You can pull the battery off again for a few minutes, or easier: pull HVAC B fuse #36 in the rear fuse block (under the rear seat - driver's side) for 2 minutes. Then put it back in with the ignition off. Then turn the key to the RUN position, but don't start the engine. Don't touch the HVAC controls for 2 minutes, and you should hear the actuators and blower motor going through all the modes and speeds.
If this does not solve the problem, then the HVAC system will need to be troubleshot.

Sep 07, 2010 | 2004 Chevrolet TrailBlazer

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I changed the battery on 2006 Trailblazer SS. Now I can only get AC from my windshield and floor vents. Nothing from the dash vents. Also the temp control only gives coldest temp. I have checked fuses...


once you disconnect the battery your body control module loses power and memory you have to get some one with a scanner with reprogramming capabilities and have the computers reset ,dealer?

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Pull the HVAC B fuse located inside the truck for 5 min and then place it back in.The short time the fuse is out and placed back in, the control module will attempt to recalibrate all the actuators, by running them CW and CCW until they hit their stops. Then the control module remembers those positions and tries to not slam the actuators into the endpoints with vigor, to avoid breaking them.
Naturally, they messed up the programming, and the recalibration process is what breaks most of them after a battery discharge or swap.
When a recalibration fails, the control module just quits using that actuator and it's frozen in position. All the other ones are OK, though. What some Trailblazer owners do as a temporary solution, is to start the recalibration process with the fuse pull. Watch the actuator until it's in exactly one position that is useful, and then quick like a bunny yank the connector to that one actuator. It might be frozen in position, but you can choose a good one. The same trick is a lot less useful with temp actuators.
Thank you for using Fixya and might be a dead airflow mode actuator. Common problem.http://forums.trailvoy.com/attachment.php?attachmentid=505&d=1208022408

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first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

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