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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1443 (HVAC SYSTEMS - GENERAL SERVICING)REPAIR INSTRUCTIONSCOMPRESSOR REPLACEMENT (LM4)INSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Add the proper amount of PAG oil to the compressor crankcase. Refer to Compressor Oil Balancing .
  2. Position the A/C compressor mounting bracket partially into the vehicle.
  3. Position the A/C compressor partially into the vehicle.
    4. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  4. Install the upper compressor mounting bolts into the compressor mounting bracket.

    Tighten:  Tighten the upper rear bolts to 50 N.m (37 lb ft).

    5. Fig 1: A/C Compressor
    GM871561Courtesy of GENERAL MOTORS CORP.
  5. Install the upper compressor mounting bolts (4) into the compressor and bracket assembly.
  6. Position the compressor and bracket assembly into the correct location on the engine.
  7. Tighten the upper compressor mounting bolts (4).

    Tighten:  Tighten the bolts to 50 N.m (37 lb ft).

  8. Raise the vehicle
  9. Start the lower compressor mounting bolts (3).

    Tighten:  Tighten the bolts to 50 N.m (37 lb ft).

  10. Connect the electrical connector to the A/C compressor.
  11. Raise the vehicle.
  12. Install the lower coolant hose. Refer to Radiator Hose Replacement - Inlet (LM4) or Radiator Hose Replacement - Inlet (LL8) in Engine Cooling.
  13. Install the compressor hose assembly to the compressor.
  14. Install the compressor hose assembly nut to the compressor.

    Tighten:  Tighten the nut to 16 N.m (12 lb ft).

  15. Install the accessory drive belt to the tensioner.
  16. Install the cooling fan and shroud. Refer to Cooling Fan and Shroud Replacement in Engine Cooling.
  17. Install the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement in Engine Controls.
  18. Install the washer solvent container. Refer to Washer Solvent Container Replacement (Envoy, TrailBlazer) or Washer Solvent Container Replacement (Rainier) in Wipers/Washer System.
  19. Fill the cooling system. Refer to Draining and Filling Cooling System (LL8) or Draining and Filling Cooling System (LM4) In Engine Cooling.
  20. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  21. Leak test the fittings of the component using the J 39400-A  . See Special Tools and Equipment .
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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.