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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1446 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (LL8)REMOVAL PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal 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. Drain the coolant. Refer to Draining and Filling Cooling System (LL8)  or Draining and Filling Cooling System (LM4) .
  2. Remove the fan and shroud. Refer to Cooling Fan and Shroud Replacement .
  3. Remove the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 4.2L.
    4. Fig 1: Removing/Installing Water Pump Pulley
    GM748318Courtesy of GENERAL MOTORS CORP.
  4. Using the J 41240  , secure the water pump pulley and remove the water pump pulley bolts.
  5. Remove the J 41240  .
  6. Remove the water pump pulley.
    7. Fig 2: Removing/Installing Water Pump
    GM637645Courtesy of GENERAL MOTORS CORP.
  7. Loosen and remove the water pump bolts.
  8. Remove the water pump.
  9. Clean and inspect the water pump. Refer to Water Pump Cleaning and Inspection in Engine Mechanical - 4.2L Unit Repair.
  10. Discard and replace the gasket.
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.