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 1569 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSRADIATOR HOSE REPLACEMENT - OUTLET (6.6L ENGINE)INSTALLATION 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 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Install the radiator outlet hose to the vehicle.
Install the radiator outlet hose and clamp to the radiator. Ensure the hose is positioned properly in order to prevent interference with the fan shroud.
Install the radiator outlet hose clip retainers to the brackets.

Fig 1: Install Radiator Outlet Hose & Clip Retainers
Courtesy of GENERAL MOTORS CORP.
Install the surge tank outlet hose (2) to the surge tank.

Fig 2: Install Surge Tank Outlet Hose
Courtesy of GENERAL MOTORS CORP.
Install the radiator outlet hose and clamp to the water pump.
Install the heater outlet hose to the radiator outlet hose.
Install the upper and lower fan shroud. Refer to Fan Shroud Replacement - Upper (W/O M74) or Fan Shroud Replacement - Upper (W/M74) and Fan Shroud Replacement - Lower .
Fill the engine coolant. Refer to Draining and Filling Cooling System .

Fig 3: Install Radiator Outlet Hose & Clamp
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.