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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1569 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSRADIATOR REPLACEMENTREMOVAL PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal 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. Drain the cooling system. Refer to Draining and Filling Cooling System .
  2. Position the inlet hose clamp from the radiator.
  3. Remove the inlet hose from the radiator.
  4. Position the outlet hose clamp from the radiator.
  5. Remove the radiator outlet hose from the radiator.
  6. Remove the lower fan shroud. Refer to Fan Shroud Replacement - Upper (W/O M74)  or  Fan Shroud Replacement - Upper (W/M74)   and  Fan Shroud Replacement - Lower   .
    Fig 1: Remove Radiator Inlet & Outlet Hose
    G02109258Courtesy of GENERAL MOTORS CORP.
  7. Position the radiator vent inlet hose clamp from the radiator.
  8. Remove the vent inlet hose from the radiator.
  9. Remove the engine oil cooler lines from the radiator. Refer to Engine Oil Cooler Pipe/Hose Quick Connect Fitting .
  10. Remove the transmission oil cooler lines from the radiator. Refer to TRANSMISSION OIL COOLER LINE QUICK CONNECT FITTING or TRANSMISSION OIL COOLER LINE QUICK CONNECT FITTING .
    Fig 2: Remove Vent Inlet Hose
    G02109259Courtesy of GENERAL MOTORS CORP.
  11. Remove the radiator bolts.
  12. Remove the radiator from the vehicle.
    Fig 3: Remove Radiator & Bolts
    G02109260Courtesy 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.