Chevrolet Silverado / GMC Sierra. Service manual — part 1655

Thermostat Housing Cleaning and Inspection .

Installation Procedure

Fig. 162: View Of Thermostat Housing
Courtesy of GENERAL MOTORS CORP.

1. If necessary, perform the following:

1. Install NEW seals to the thermostats.

2. Install the thermostats.

3. Install the thermostat cover and bolts.

Tighten: Tighten the bolts to 21 N.m (15 lb ft).

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

4. Install a NEW O-ring seal to the thermostat bypass pipe.

5. Install the thermostat bypass pipe to the thermostat housing.

2. Install a NEW thermostat bypass pipe to water pump O-ring seal.

3. Install the thermostat housing crossover using NEW gaskets.

4. Install the thermostat housing crossover bolts and nuts.

Tighten: Tighten the bolts/nuts to 21 N.m (15 lb ft).

Fig. 163: View Of Water Pump Inlet Pipe Bolts
Courtesy of GENERAL MOTORS CORP.

5. Install the water pump inlet pipe bolts.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Tighten: Tighten the bolts to 21 N.m (15 lb ft).

Fig. 164: View Of Fuel Line Bracket Bolt & Thermostat Housing Crossover (6.6L
LMM)
Courtesy of GENERAL MOTORS CORP.

6. Install the fuel line bracket bolt at the thermostat housing crossover.

Tighten: Tighten the bolt to 21 N.m (15 lb ft).

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 165: View Of Turbocharger Coolant Outlet Hose & Clamps
Courtesy of GENERAL MOTORS CORP.

7. Install the turbocharger coolant return pipe hose.

8. Position the turbocharger coolant return pipe hose clamp.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado