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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1446 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSRADIATOR REPLACEMENT (LM4)INSTALLATION 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 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the radiator.
  2. Install the condenser to the radiator retaining tab.
  3. Install the coolant recovery line to the radiator.
    4. NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Install the bolts retaining the condenser to the radiator.

    Tighten:  Tighten the bolts to 28 N.m (21 lb ft).

  5. Install the grille. Refer to Air Inlet Grille Panel Replacement (Envoy, TrailBlazer) or Air Inlet Grille Panel Replacement (Rainier) in Body Front End.
  6. Install the cooling fan and shroud. Refer to Cooling Fan and Shroud Replacement .
    7. Fig 1: View Of Radiator Hose Clamps
    GM753673Courtesy of GENERAL MOTORS CORP.
  7. Install the inlet radiator hose to the radiator.
  8. Reposition the inlet radiator hose clamp (1) using J 38185  .
  9. Raise the vehicle.
    10. Fig 2: View Of Radiator Hose
    GM750179Courtesy of GENERAL MOTORS CORP.
  10. Install the outlet radiator hose (1) to the radiator.
    11. Fig 3: View Of Radiator Hose Clamps
    GM753673Courtesy of GENERAL MOTORS CORP.
  11. Reposition the outlet radiator hose clamp (1) using J 38185  .
  12. Connect the transmission cooler lines to the radiator. Refer to Transmission Fluid Cooler Line Quick Connect Fitting in Automatic Transmission - 4L60-E/4L65-E.
  13. Install the lower radiator support shield, if equipped. Refer to Radiator Support Shield Replacement in Frame and Underbody.
  14. Lower the vehicle.
  15. Fill the cooling system. Refer to Draining and Filling Cooling System (LL8)  or Draining and Filling Cooling System (LM4) .
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.