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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 685 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (6.6L ENGINE)REMOVAL 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 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the left front fender wheelhouse inner panel (1).
    2. Fig 1: Fender Wheelhouse Inner Panel
    G01658158Courtesy of GENERAL MOTORS CORP.
  2. Drain the engine coolant and the engine block.

    Refer to Draining & Filling Cooling System .

  3. Remove the thermostat housing crossover. Refer to Thermostat Housing Crossover Replacement (6.6L Engine) .
  4. Remove the fan clutch. Refer to Fan Replacement .
  5. Remove the crankshaft balancer.
  6. Remove the water pump outlet pipe to water pump nuts.
    7. Fig 2: Water Pump Outlet Pipe
    G01658159Courtesy of GENERAL MOTORS CORP.
  7. Remove the engine wiring harness retainer from the inner stud.
  8. Remove the water pump bolts. Note the location of the bolts. The bolts are three different lengths.
  9. Remove the water pump assembly.
  10. Remove the water pump outlet pipe gasket.
    Fig 3: Water Pump Assembly
    G01658160Courtesy 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.