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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 675 (HVAC SYSTEMS - AUTOMATIC)REPAIR INSTRUCTIONSMODE ACTUATOR REPLACEMENT (W/ D07)INSTALLATION 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 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the mode actuator as an assembly with the actuator cam.
    • Line up the heater/defroster valve lever with the mode actuator cam slot.
    • Line up the A/C valve lever with the mode actuator cam.
  2. Install the mode actuator mounting screw to the HVAC module. Tighten the screw to 1.6 N.m (14 lb in).
  3. Connect the electrical connection at the mode actuator (10).
  4. Install the center console duct.
  5. Install the screws from the center console duct. Tighten the screw to 1.6 N.m (14 lb in).
  6. Install the center console.
  7. Install the floor air outlet duct extension (1) to the floor air duct (2).
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.