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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 671 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (8.1L ENGINE)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 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Outlet Hose To The Water Pump
    GM751427Courtesy of GENERAL MOTORS CORP.
  1. Drain the cooling system. Refer to Draining and Filling Cooling System .
  2. Remove the drive belt. Refer to DRIVE BELT TENSIONER REPLACEMENT -- ACCESSORY .
  3. Remove the fan clutch. Refer to Fan Clutch Replacement .
  4. Reposition the outlet hose clamp at the water pump.
  5. Remove the outlet hose from the water pump.
    6. Fig 2: Thermostat Bypass Hose & Clamps
    GM470692Courtesy of GENERAL MOTORS CORP.
  6. Reposition the bypass hose clamps at the water pump and water crossover.
  7. Remove the bypass hose.
    8. Fig 3: View Of Water Pump & Gasket
    GM470790Courtesy of GENERAL MOTORS CORP.
  8. Remove the water pump bolts.
  9. Remove the water pump.
  10. Remove and discard the water pump gaskets.
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.