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 REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation 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.

Install a new O-ring to the vehicle.
Install the water pump to the vehicle.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Use 6 bolts (1, 2) in order to secure the water pump.
Tighten
- On LV6 engine, tighten the water pump bolts (1) to 9 N.m (80 lb in).
- Tighten the water pump bolts (2) to 11 N.m (8 lb ft).
- On LNK engine, tighten the water pump bolts to 9 N.m (80 lb in).
Install the left side lower engine splash shield. Refer to SPLASH SHIELD REPLACEMENT - ENGINE - LEFT in Body Front End.
Install the right side lower engine splash shield. Refer to SPLASH SHIELD REPLACEMENT - ENGINE - RIGHT in Body Front End.
Lower the vehicle.
On LV6 engine, install the water pump pulley.
1. Tighten
2. Tighten the water pump pulley bolts to 15 N.m (11 lb ft).
On all engines, install the generator. Refer to GENERATOR in Engine Electrical.
Install the accessory drive belt. Refer to DRIVE BELT REPLACEMENT in Engine Mechanical.
CAUTION: Refer to BATTERY DISCONNECT CAUTION in Cautions and Notices.
Connect the negative battery cable.
Use approved engine coolant in order to fill the radiator. Refer to DRAINING AND FILLING COOLING SYSTEM .
Start the engine.
Inspect the system for leaks.

Fig 1: Installing Water Pump To Vehicle
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.