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 MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 620 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSTHERMOSTAT REPLACEMENT (6.6L ENGINE)INSTALLATION PROCEDURE

2006 Chevrolet Suburban C2500, 6.0 U

Installation Procedure

2006 Chevrolet Suburban C2500, 6.0 USECTION 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 thermostats and seals to the thermostat housing.
The rear thermostat (4) has 2 vent valves. Install with the vent valves towards the rear of engine.

Fig 1: Install Thermostats
Courtesy of GENERAL MOTORS CORP.
Install the thermostat housing cover with a NEW gasket.
NOTE: Refer to FASTENER NOTICE .
Install the thermostat housing cover bolts.
Tighten

Tighten the bolts to 21 N.m (15 lb ft).
Install the fuel line bracket bolt.
Tighten

Tighten the bolt to 21 N.m (15 lb ft).
Install the water outlet. Refer to Water Outlet Tube Replacement (6.6L Engine) .

Fig 2: Install Thermostat Housing Cover Bolts
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.