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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 818 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSFAN REPLACEMENTINSTALLATION 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 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Do not use or attempt to repair a damaged cooling fan assembly. Replace damaged fans with new assemblies. An unbalanced cooling fan could fly apart causing personal injury and property damage.
  1. Install the fan clutch bolts.
  2. Install the fan clutch onto the fan blade, if necessary.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. Install the fan clutch bolts.

    Tighten 

    Tighten the bolts to 23 N.m (17 lb ft).

    Fig 1: Installing Fan Clutch Onto Fan Blade
    G02117745Courtesy of GENERAL MOTORS CORP.
  4. Install the fan blade.
    Fig 2: Installing Fan Blade
    G02117746Courtesy of GENERAL MOTORS CORP.
  5. Install the J 46406  and the J 41240-5A  to the fan clutch.

    Tighten 

    Tighten the fan clutch nut clockwise to 56 N.m (41 lb ft).

  6. Install the upper fan shroud. Refer to FAN SHROUD REPLACEMENT - UPPER (W/O M74)  or FAN SHROUD REPLACEMENT - UPPER (W/M74)  .
    Fig 3: Installing Fan Clutch
    G02117747Courtesy 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.