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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 685 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (4.3L 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. Loosen the air cleaner outlet duct clamp at the mass airflow/intake air temperature sensor.
    Fig 1: Air Cleaner Outlet Duct
    G01658128Courtesy of GENERAL MOTORS CORP.
  2. Remove the positive crankcase ventilation (PCV) hose.
    Fig 2: PCV Hose
    G01658129Courtesy of GENERAL MOTORS CORP.
  3. Remove the air cleaner adapter nut.
    Fig 3: Air Cleaner Adapter Nut
    G01658130Courtesy of GENERAL MOTORS CORP.
  4. In order to remove the air cleaner outlet duct, pivot the duct upward until the hinge clip release from the lip on the throttle body.
  5. Drain the cooling system. Refer to Draining & Filling Cooling System .
  6. Remove the cooling fan. Refer to Fan Replacement .
  7. Remove the drive belt.
  8. Reposition the radiator outlet hose clamps at the surge tank and water pump.
  9. Remove the radiator outlet hose from the surge tank.
  10. Remove the radiator outlet hose from the water pump.
    Fig 4: Radiator Outlet Hose From Water Pump
    G01658132Courtesy of GENERAL MOTORS CORP.
  11. Reposition the water pump inlet hose clamps.
  12. Remove the water pump inlet hose.
    Fig 5: Water Pump Inlet Hose
    G01658133Courtesy of GENERAL MOTORS CORP.
  13. Using J 41240  to hold the water pump pulley, remove the water pump pulley bolts.
    Fig 6: Removing Water Pump Pulley
    G01658134Courtesy of GENERAL MOTORS CORP.
  14. Remove the water pump bolts.
  15. Remove the water pump.
  16. Remove and discard the water pump gaskets.
  17. Clean and inspect the water pump, if necessary.
    Fig 7: Water Pump Assembly & Gaskets
    G01658135Courtesy of GENERAL MOTORS CORP.
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.