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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 593 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSFAN CLUTCH 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 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the fan to the clutch.
    CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  2. Install the retaining bolts to the fan and clutch.

    Tighten 

    • Tighten the 4.3L, 5.0L, 5.7L, and the 8.1L fan to clutch bolts to 33 N.m (24 ft lbs).
    • Tighten the 6.5L diesel fan to clutch bolts to 17 N.m (13 ft lbs).
    Fig 1: Installing Fan & Retaining Bolts
    G01699525Courtesy of GENERAL MOTORS CORP.
  3. Install the fan and clutch on the 4.3L, 5.0, 5.7L, and the 8.1L using the J 41240  .

    Tighten 

    Tighten the fan clutch nut to 57 N.m (42 ft lbs).

  4. Install the fan and clutch on the 6.5L using the J 41240-5A  and J 41240  .

    Tighten 

    Tighten the fan clutch nut to 57 N.m (42 ft lbs).

  5. Install the upper radiator shroud. Refer to Fan Shroud Replacement .
  6. Install the coolant recovery reservoir or surge tank. Refer to Coolant Recovery Reservoir Replacement  or Surge Tank Replacement .
  7. Install the air cleaner and the duct.
    Fig 2: Installing Fan, Clutch, Upper Radiator Shroud, Coolant Recovery Reservoir, Air Cleaner & Duct
    G01699526Courtesy 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.