GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Avalanche - 4WD 🢒 Engine 🢒 Engine Mechanical - Hybrid (HP2) 6.0L (LFA) 🢒 Engine Coolant Air Bleed Pipe Replacement

Engine Coolant Air Bleed Pipe Replacement RPOs LY2/LY6

Removal Procedure

    Object Number: 1699347 Size: SH
  1. If replacing the rear coolant air bleed covers, remove the intake manifold. Refer to Intake Manifold Replacement . 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 .
  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.

    6. Object Number: 1403313 Size: SH
  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).

    8. Object Number: 1403314 Size: SH
  8. Remove the coolant air bleed cover bolts (312), if required.
  9. Remove the coolant air bleed covers (313) and seals (308), if required.

    10. Object Number: 1552485 Size: SH
  10. Remove the seals (308) from the coolant air bleed pipe and/or covers.
  11. Discard the seals.

Installation Procedure

    Object Number: 1552485 Size: SH

    Important: Position the O-ring seal (308) onto the nipple portion of the pipe.

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

    2. Object Number: 1403313 Size: SH
  2. Install the coolant air bleed pipe (307) and seals (308) onto the cylinder heads.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the coolant air bleed pipe bolts (309).

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


    Object Number: 1403314 Size: SH
  4. Install the coolant air bleed covers (313) and seals (308), if required.
  5. Install the coolant air bleed cover bolts (312), if required.

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


    Object Number: 1699347 Size: SH
  6. Install the radiator vent inlet hose (2) to the coolant air bleed pipe fitting.
  7. Position the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
  8. Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  9. Fill the cooling system. Refer to Cooling System Draining and Filling .
  10. If the rear coolant air bleed covers were replaced, install the intake manifold. Refer to Intake Manifold Replacement .

Engine Coolant Air Bleed Pipe Replacement RPOs LC9/LY5/LMG/L76/L92/LFA

Removal Procedure

    Object Number: 1699347 Size: SH
  1. If replacing the rear coolant air bleed covers, remove the intake manifold. Refer to Intake Manifold Replacement . 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 .
  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.

    6. Object Number: 1401993 Size: SH
  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).

    8. Object Number: 1402001 Size: SH
  8. Remove the coolant air bleed cover bolts (312), if required.
  9. Remove the coolant air bleed covers (313) and seals (308), if required.

    10. Object Number: 1552485 Size: SH
  10. Remove the seals (308) from the coolant air bleed pipe and/or covers.
  11. Discard the seals.

Installation Procedure

    Object Number: 1552485 Size: SH

    Important: Position the O-ring seal (308) onto the nipple portion of the pipe.

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

    2. Object Number: 1401993 Size: SH
  2. Install the coolant air bleed pipe (307) and seals (308) onto the cylinder heads.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the coolant air bleed pipe bolts (309).

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


    Object Number: 1402001 Size: SH
  4. Install the coolant air bleed covers (313) and seals (308), if required.
  5. Install the coolant air bleed cover bolts (312), if required.

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


    Object Number: 1699347 Size: SH
  6. Install the radiator vent inlet hose (2) to the coolant air bleed pipe fitting.
  7. Position the radiator vent inlet hose clamp (1) at the coolant air bleed pipe fitting.
  8. Install the air cleaner outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
  9. Fill the cooling system. Refer to Cooling System Draining and Filling .
  10. If the rear coolant air bleed covers were replaced, install the intake manifold. Refer to Intake Manifold Replacement .