Chevrolet Silverado / GMC Sierra. Manual — part 1659

Second Design) or Intake Manifold Replacement (LY2 and LY6) or Intake Manifold
Replacement (LH6, LMG, LY5 and L76) . Otherwise proceed to the next step.

2. Remove the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct

Replacement .

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

Cooling System Draining and Filling (Static Fill).

4. Reposition the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.

5. Remove the radiator vent inlet hose (2) from the coolant air bleed pipe fitting.

2008 Chevrolet Silverado 1500

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

Fig. 178: Removing/Installing Engine Coolant Air Bleed Pipe
Courtesy of GENERAL MOTORS CORP.

6. Remove the coolant air bleed pipe bolts (309) (intake manifold shown removed for clarity).

7. Remove the coolant air bleed pipe (307) and seals (308).

Fig. 179: Removing/Installing Coolant Air Bleed Cover Bolts
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

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

8. Remove the coolant air bleed cover bolts (312), if required.

9. Remove the coolant air bleed covers (313) and seals (308), if required.

Fig. 180: View Of Coolant Air Bleed Pipe Seal
Courtesy of GENERAL MOTORS CORP.

10. Remove the seals (308) from the coolant air bleed pipe and/or covers.

11. Discard the seals.

2008 Chevrolet Silverado 1500

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

Installation Procedure

Fig. 181: View Of Coolant Air Bleed Pipe Seal
Courtesy of GENERAL MOTORS CORP.

1. Install the seals onto the coolant air bleed pipe and/or covers.

IMPORTANT: Position the O-ring seal (308) onto the nipple portion of the

pipe.

2008 Chevrolet Silverado 1500

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