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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1446 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENT (LM4)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.
    Fig 1: View Of Intake Air Tube
    GM898123Courtesy of GENERAL MOTORS CORP.
  1. Drain the cooling system. Refer to Draining and Filling Cooling System (LL8)  or Draining and Filling Cooling System (LM4) .
  2. Loosen the air cleaner outlet duct clamps at the following locations:
    • Throttle body
    • Mass air flow (MAF)/intake air temperature (IAT) sensor
  3. Remove the air cleaner outlet duct bolt and duct.
  4. Remove the accessory drive belt tensioner. Refer to Drive Belt Tensioner Replacement - Accessory in Engine Mechanical - 4.8L, 5.3L, and 6.0L.
  5. Remove the cooing fan and shroud. Refer to Cooling Fan and Shroud Replacement .
    6. Fig 2: Removing/Installing Inlet Hose From Water Pump
    GM901490Courtesy of GENERAL MOTORS CORP.
  6. Using J 38185  , reposition the inlet hose clamp at the water pump.
  7. Remove the inlet hose from the water pump.
    8. Fig 3: Removing/Installing Outlet Hose From Water Pump
    GM901491Courtesy of GENERAL MOTORS CORP.
  8. Using J 38185  , reposition the outlet hose clamp at the water pump.
  9. Remove the outlet hose from the water pump.
    10. Fig 4: View Of Auxiliary Heater Inlet & Outlet Hoses/Pipes
    GM901492Courtesy of GENERAL MOTORS CORP.
  10. Remove the auxiliary heater inlet and outlet hose/pipe nut.
  11. Using J 38185  , reposition the throttle body hose clamp at the throttle body.
  12. Remove the hose from the throttle body.
  13. Using J 38185  , reposition the auxiliary heater inlet and outlet hose/pipe clamps at the water pump.
  14. Remove the inlet and outlet hoses/pipes from the water pump.
    15. Fig 5: View Of Water Pump, Gaskets & Bolts
    GM260121Courtesy of GENERAL MOTORS CORP.
  15. Remove the water pump bolts.
  16. Remove the water pump and gaskets.
  17. 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.