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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1443 (HVAC SYSTEMS - GENERAL SERVICING)REPAIR INSTRUCTIONSCOMPRESSOR HOSE ASSEMBLY REPLACEMENT (LL8)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.
    Fig 1: Compressor Discharge Hose From Condenser
    GM735782Courtesy of GENERAL MOTORS CORP.
  1. Install new O-ring seals. Refer to O-Ring Replacement .
  2. Install the compressor discharge hose (2) to the condenser (4).
    3. NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. Install the compressor discharge hose nut.

    Tighten:  Tighten the hose nut to 28 N.m (21 lb ft).

  4. Install the compressor hose to the connector through the driver wheel opening.
  5. Install the nut.

    Tighten:  Tighten the nut to 48 N.m (35 lb ft).

  6. Install the compressor suction hose to the stud on the engine.
  7. Install the nut.

    Tighten:  Tighten the nut to 48 N.m (35 lb ft).

  8. Install the compressor suction hose to the engine lift bracket.
  9. Install the bolt.

    Tighten:  Tighten the bolt to 48 N.m (35 lb ft).

  10. Connect the compressor suction hose (1) to the accumulator.
  11. Install the compressor suction hose nut to the accumulator.

    Tighten:  Tighten the nut to 48 N.m (35 lb ft).

  12. Install the sealing washers. Refer to Sealing Washer Replacement .
    13. Fig 2: View Of Compressor Hose Assembly
    GM735911Courtesy of GENERAL MOTORS CORP.
  13. Connect the compressor hose assembly hose to the compressor (4).
  14. Install the compressor hose assembly washers.
  15. Install the retaining nut (3).

    Tighten:  Tighten the nut to 33 N.m (24 lb ft).

  16. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  17. Leak test the fittings of the components 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.