Chevrolet Silverado / GMC Sierra. Service manual — part 1653

2. Remove the thermostat.

Installation Procedure

Fig. 154: View Of Thermostat & Housing
Courtesy of GENERAL MOTORS CORP.

1. Install the thermostat.

2. Install the thermostat housing. Refer to Engine Coolant Thermostat Housing

Replacement (LY2, LH6, LY5, LMG, LY6).

THERMOSTAT HOUSING CROSSOVER REPLACEMENT (LMM)

Removal Procedure

2008 Chevrolet Silverado 1500

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

Fig. 155: View Of A/C Pressure Switch Electrical Connector & A/C Compressor
Clutch Electrical Connector
Courtesy of GENERAL MOTORS CORP.

1. Remove the air cleaner. Refer to Air Cleaner Assembly Replacement .

2. Drain the cooling system. Refer to Cooling System Draining and Filling (Vac-N-Fill) or

Cooling System Draining and Filling (Static Fill).

3. Disconnect the negative battery cables. Refer to Battery Negative Cable Disconnection

and Connection (w/Single Battery) or Battery Negative Cable Disconnection and
Connection (w/Auxiliary Battery) or Battery Negative Cable Disconnection and
Connection (w/Dual Batteries) .

4. Remove the drive belt. Refer to Drive Belt Replacement .

2008 Chevrolet Silverado 1500

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

5. Disconnect the air conditioning (A/C) pressure switch electrical connector (1).

6. Disconnect the A/C compressor clutch electrical connector (2).

7. Remove the generator bracket. Refer to Generator Bracket Replacement (4.3L) or

Generator Bracket Replacement (4.8L, 5.3L, 6.0L, and 6.2L) or Generator Bracket
Replacement (6.6L) .

8. Remove the front oil fill tube. Refer to Oil Filler Tube Replacement .

Fig. 156: View Of (ECT) Sensor Electrical Connectors
Courtesy of GENERAL MOTORS CORP.

9. Disconnect the engine coolant temperature (ECT) sensor electrical connectors.

10. Remove the water outlet. Refer to Water Outlet Tube Replacement (LMM) or Water

Outlet Tube Replacement (LU3).

11. Without disconnecting the power steering hoses, remove the power steering pump bolts and

2008 Chevrolet Silverado 1500

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

the power steering pump. Reposition the power steering pump and secure to the side. Refer
to Power Steering Pump Replacement (4.3L) or Power Steering Pump Replacement
(4.8L, 5.3L, 6.0L, and 6.2L) or Power Steering Pump Replacement (6.6L) .

12. Remove the power steering pump bracket. Refer to Air Conditioning (A/C) Compressor

and Power Steering Pump Bracket Replacement .

Fig. 157: View Of Wiring Harness Bracket & Bolts
Courtesy of GENERAL MOTORS CORP.

13. Remove the bolts and wiring harness bracket at the thermostat housing.

14. Position the bracket and wiring harness aside.

15. Remove the cooling fan pulley. Refer to Cooling Fan Pulley Replacement.

2008 Chevrolet Silverado 1500

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