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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1569 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSRADIATOR 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 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the radiator to the vehicle.
    NOTE: Refer to FASTENER NOTICE .
  2. Install the radiator bolts.

    Tighten 

    Tighten the bolts to 25 N.m (18 lb ft).

  3. Install the engine oil cooler lines to the radiator. Refer to Engine Oil Cooler Pipe/Hose Quick Connect Fitting .
  4. Install the transmission oil cooler lines to the radiator. Refer to TRANSMISSION OIL COOLER LINE QUICK CONNECT FITTING or TRANSMISSION OIL COOLER LINE QUICK CONNECT FITTING .
    Fig 1: Install Radiator & Bolts
    G02109261Courtesy of GENERAL MOTORS CORP.
  5. Install the radiator vent inlet hose to the radiator.
  6. Reposition the radiator vent inlet hose clamp to the radiator.
  7. Install the lower fan shroud. Refer to Fan Shroud Replacement - Lower .
  8. Install the outlet hose to the radiator.
  9. Reposition the outlet hose clamp to the radiator.
  10. Install the inlet hose to the radiator.
  11. Reposition the inlet hose clamp to the radiator.
  12. Fill the cooling system. Refer to Draining and Filling Cooling System .
    Fig 2: Install Radiator Vent Inlet
    G02109262Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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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.