Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1286 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSWATER PUMP REPLACEMENTREMOVAL 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 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Refer to BATTERY DISCONNECT CAUTION in Cautions and Notices.

Disconnect the negative battery cable.
Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
Remove the accessory drive belt. Refer to DRIVE BELT REPLACEMENT in Engine Mechanical.
Raise the vehicle. Support the vehicle. Refer to LIFTING & JACKING VEHICLE in General Information.
Remove the right side lower engine splash shield. Refer to SPLASH SHIELD REPLACEMENT - ENGINE - RIGHT in Body Front End.
Remove the left side lower engine splash shield. Refer to SPLASH SHIELD REPLACEMENT - ENGINE - LEFT in Body Front End.
Remove the generator. Refer to GENERATOR in Engine Electrical.
On LV6 engine, remove the water pump pulley.
On all engines, remove the following components from the vehicle:
- The 6 water pump bolts (1, 2)
- The water pump
Remove the O-ring from the vehicle.

Fig 1: Removing Water Pump Bolts
Courtesy 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.