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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 593 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSFAN SHROUD 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 lower fan shroud to the vehicle.
    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 lower fan shroud.

    Tighten 

    Tighten the bolts to 8 N.m (71 in lbs).

  3. Install the fan and the clutch to the engine. Refer to Fan Clutch Replacement .
    Fig 1: Installing Lower Fan Shroud & Bolts
    G01699612Courtesy of GENERAL MOTORS CORP.
  4. Install the upper fan shroud to the lower fan shroud.
  5. Install the upper to lower fan shroud retaining bolts.

    Tighten 

    Tighten the bolts to 8 N.m (71 in lbs).

    Fig 2: Installing Upper Fan Shroud To Lower Fan Shroud
    G01699613Courtesy of GENERAL MOTORS CORP.
  6. Install the upper fan shroud retaining bolts to the top of the radiator.

    Tighten 

    Tighten the bolts to 8 N.m (71 in lbs).

    Fig 3: Installing Upper Fan Shroud Retaining Bolts
    G01699614Courtesy of GENERAL MOTORS CORP.
  7. If equipped with 4.3L, 5.0L, and 5.7L, reseal the engine upper to lower oil level indicator tube.
    • Apply RTV sealant GM P/N 12346286 or equivalent to the top end of the oil level indicator tube at the joint.
    • Install the top half of the tube into the lower half of the oil level indicator tube.
    Fig 4: Installing Top Half Of Tube Into Lower Half Of Oil Level Indicator Tube
    G01699615Courtesy of GENERAL MOTORS CORP.
  8. Install the bolt retaining the oil level indicator tube and the transmission fluid fill tube to the oil fill tube lower support.

    Tighten 

    Tighten the tubes lower support bolt to 4 N.m (44 in lbs).

    Fig 5: Installing Bolt Retaining Oil Level Indicator Tube & Transmission Fluid Fill Tube
    G01699616Courtesy of GENERAL MOTORS CORP.
  9. Install the screw holding the oil fill tube to the oil fill tube lower support.
  10. Install the coolant reservoir or surge tank. Refer to Coolant Recovery Reservoir Replacement  or Surge Tank Replacement .
  11. Install the air intake duct from the throttle body.
  12. Install the air cleaner assembly. Refer to the appropriate procedure:
    Fig 6: Installing Oil Fill Tube Screw
    G01699617Courtesy 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.