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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 226 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSENGINE COOLANT THERMOSTAT REPLACEMENT (LH2)INSTALLATION PROCEDURE

2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Installation Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Installation Procedure

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Exploded View Of Thermostat Assembly

Courtesy of GENERAL MOTORS CORP.

Clean the thermostat housing and water housing sealing surfaces.
Install the new thermostat to the thermostat housing.
Install the NEW seal (2) to the thermostat housing.
Install the thermostat housing (1) with the thermostat (3) and the seal (2) to the water housing.

NOTE: Refer to Fastener Notice .

Install the thermostat housing bolts.
Tighten: Tighten the thermostat housing bolts to 10 N.m (89 lb in).
Install the heater hose to the thermostat housing. Refer to Heater Outlet Hose Replacement (LY7) or Heater Outlet Hose Replacement (LH2) .
Install the radiator hose to the thermostat housing. Refer to Radiator Outlet Hose Replacement (LY7) .
Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (GE 47716) .

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.