Question about 2002 Chevrolet TrailBlazer

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Rear HVAC unit in 2002 trailblazer making loud poping noise and then quits after a couple of minutes

Pulled Fuse 13 from the rear fuse panel. It says that it controls the HVAC. Turn the key on and the rear HVAC system has a loud pop pop pop noise for over two to Five minutes and then it quits

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  • Ernie Bartels
    Ernie Bartels Oct 26, 2012

    This noise is in the right rear HVAC system on a Trailblazer. It sound like something is very wrong- but it quits after a few minutes.

  • Ernie Bartels
    Ernie Bartels Oct 26, 2012

    There is a flapper assembly in the rear HVAC that the plastic gears are broken and thus the popping noise. Will have to replace the flapper and electronic motor that control it

  • yadayada
    yadayada Oct 26, 2012

    That is called the blend door actuator, it moves the door that controls the heater and cool air flow mixture. You will need to replace the blend door and the electric drive motor that moves it (actuator).

  • yadayada
    yadayada Oct 26, 2012

    Full name is "AIR TEMPERATURE CONTROL BLEND DOOR"

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  • Chevrolet Master
  • 75,797 Answers

The only thing i can think this would be is a blower motor noise, have shop take a listen is my best advice.

Posted on Oct 26, 2012

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Posted on Jan 02, 2017

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SOURCE: 2005 chev trailblazer v6 4.2 rear side brake light

CHECK FOR POWER AND GROUND AT THE CIRCUIT BOARD FOR THE AFFECTED BRAKE LIGHT. IF THAT CHECK OUT GOOD THEN CHECK THE BULB CONNECTION FOR BURNED CONNECTORS, THIS IS A COMMON PROBLEM. LOOPING A TEST LIGHT FROM THE POWER TO THE GROUND CONNECTION AND HOLDING THE BRAKE PEDAL DOWN IT SHOULD LIGHT. IF IT DON'T THE CIRCUIT BOARD IS BAD.

Posted on May 24, 2009

  • 1311 Answers

SOURCE: Cannot find fuse box diagram for a 2003 Chevy

Go to www.trailvoy.com, look for resources, then OEM manuals, click on owners manual for your vehicle.

Posted on Dec 10, 2010

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Jan 03, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

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1 Answer

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