Chevrolet Silverado / GMC Sierra. Service manual — part 1679

Fig. 257: Locating Coolant Heater
Courtesy of GENERAL MOTORS CORP.

10. Remove the coolant heater from the engine block.

11. Remove any burrs, sealer, or other rough spots.

IMPORTANT: Do not score the surface of the engine block hole when

removing the coolant heater.

2008 Chevrolet Silverado 1500

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

Installation Procedure

Fig. 258: Locating Coolant Heater
Courtesy of GENERAL MOTORS CORP.

1. If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N

10953480), or equivalent to the threads.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

2. Install the coolant heater to the engine block.

Tighten: Tighten the coolant heater to 50 N.m (37 lb ft).

Fig. 259: View Of Coolant Heater Cord
Courtesy of GENERAL MOTORS CORP.

3. Connect the coolant heater cord electrical connector.

2008 Chevrolet Silverado 1500

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

Fig. 260: Locating Oil Cooler Hose Bracket & Adapter Bolts
Courtesy of GENERAL MOTORS CORP.

4. For vehicles with RPO L76 (6.0L) perform the following steps otherwise proceed to step 9.

5. Position the oil cooler hose adapter end, if equipped.

6. Install a NEW oil cooler hose adapter gasket, if equipped.

7. Install the oil cooler hose adapter bolts (2), if equipped.

Tighten: Tighten the bolts to 12 N.m (106 lb in).

8. Install the oil cooler hose bracket bolt (1), if equipped.

Tighten: Tighten the bolt to 25 N.m (18 lb ft).

2008 Chevrolet Silverado 1500

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