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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1230 (HVAC SYSTEMS - MANUAL)REPAIR INSTRUCTIONSHVAC CONTROL VACUUM VALVE REPLACEMENTINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the vacuum valve to the HVAC control module.
  2. Connect the electrical connectors to the HVAC control module.
  3. Connect the vacuum connectors to the HVAC control vacuum valve.
    Fig 1: Connecting Vacuum Connectors To HVAC Control Vacuum Valve
    G01482301Courtesy of GENERAL MOTORS CORP.
  4. Install the HVAC control module to the instrument panel.
    NOTE: Refer to FASTENER NOTICE .
  5. Install the screws to the HVAC control module.

    Tighten 

    Tighten the screws to 2 N.m (18 lb ft).

  6. Install the instrument panel cluster trim panel. Refer to TRIM PANEL REPLACEMENT - INSTRUMENT PANEL (I/P) CLUSTER .
    Fig 2: Installing Screws To HVAC Control Module
    G01482302Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.