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 INSTRUCTIONSRADIATOR 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.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.

Position the radiator fan with the motor.
1. Tighten
2. Tighten the radiator bolts to 13 N.m (9 lb ft).
Connect two fan motor electrical harness clamps to the fan shroud.
Connect the fan motor electrical connector.
Connect the transmission oil cooler lines.
Install the radiator outlet hose. Refer to RADIATOR HOSE REPLACEMENT - OUTLET
Install the radiator inlet hose. Refer to RADIATOR HOSE REPLACEMENT - INLET
Refill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
CAUTION: Refer to BATTERY DISCONNECT CAUTION in Cautions and Notices.
Connect the negative battery cable.
IMPORTANT: Watch for a potential overheating condition while the engine is operating with the radiator cap off.
Start and run the engine until the coolant is at operating temperature.
Inspect the transmission fluid level, on vehicles with automatic transmission. Refer to in Automatic Transmission.
Tighten any loose connections as necessary.

Fig 1: Installing Radiator Fan With The Motor
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.