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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)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 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: View Of Water Pump & Gasket
    GM470790Courtesy of GENERAL MOTORS CORP.
  1. Place NEW water pump gaskets into place.
  2. Install the water pump.
    NOTE: Refer to FASTENER NOTICE .
  3. Install the water pump bolts.

    Tighten:  Tighten the water pump bolts to 50 N.m (37 lb ft).

    4. Fig 2: Thermostat Bypass Hose & Clamps
    GM470692Courtesy of GENERAL MOTORS CORP.
  4. Install the bypass hose.
  5. Position the bypass hose clamps at the water pump and water crossover.
    6. Fig 3: Identifying Outlet Hose To The Water Pump
    GM751427Courtesy of GENERAL MOTORS CORP.
  6. Install the outlet hose to the water pump.
  7. Position the outlet hose clamp at the water pump.
  8. Install the fan clutch. Refer to Fan Clutch Replacement .
  9. Install the drive belt. Refer to DRIVE BELT REPLACEMENT -- ACCESSORY .
  10. Fill the cooling system. Refer to Draining and Filling Cooling System .
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.