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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 685 (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 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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.
- Install the surge tank outlet hose (2) to the surge tank.
- 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) , Fan Shroud Replacement - Upper (W/M74) or Fan Shroud Replacement - Lower .
- Fill the engine coolant. Refer to Draining & Filling Cooling System .
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.