Engine Coolant Air Bleed Pipe Replacement LS4

Important: Removal of the intake manifold is NOT required to service the coolant air bleed pipe, but is required to service the coolant air bleed pipe covers and/or gaskets.

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the intake manifold. Refer to Intake Manifold Replacement .
3. Disconnect the hose clamp and hose from the coolant fill neck.
4. Remove the coolant air bleed pipe bolts (309).
5. Remove the coolant air bleed pipe (307) with hose and seals (308).



6. Remove the hose (311) and clamps (322) from the coolant air bleed pipe (307) as required.



7. Remove the engine coolant air bleed cover bolts (312).
8. Remove the covers (313) with seals (308).



9. Remove the seals (308) from the pipe and covers. Discard the seals.

Important: Position the O-ring seal onto the nipple portion of the pipe.

1. Install NEW seals (308) onto the engine coolant air bleed pipe and covers.



2. Install the covers (313) with seals (308).

Notice: Refer to Fastener Notice in the Preface section.

3. Install the engine coolant air bleed cover bolts (312).

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




4. Install the hose (311) and clamps (322) to the coolant air bleed pipe (307) as required.



5. Install the coolant air bleed pipe (307) with hose and seals (308).
6. Install the coolant air bleed pipe bolts (309).

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

7. Install the intake manifold. Refer to Intake Manifold Replacement .
8. Connect the clamp and hose to coolant fill neck.
9. Fill the cooling system. Refer to Cooling System Draining and Filling .