GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Envoy - 2WD 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Air Bleed Pipe Replacement

Removal Procedure

    Object Number: 1740027 Size: SH
  1. Drain the cooling system, if necessary. Refer to Cooling System Draining and Filling .
  2. Remove the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.
  3. Reposition the coolant air bleed hose clamp at the coolant air bleed pipe.
  4. Remove the coolant air bleed hose from the coolant air bleed pipe.

    5. Object Number: 1403313 Size: SH
  5. Remove the coolant air bleed pipe bolts (309).
  6. Remove the coolant air bleed pipe (307) with seals (308).

    7. Object Number: 1403314 Size: SH
  7. Remove the coolant air bleed pipe cover bolts (312), if necessary.
  8. Remove the coolant air bleed covers (313) with seals (308), if necessary.

    9. Object Number: 1552485 Size: SH
  9. Remove and discard the seals (308) from the coolant air bleed pipe and covers.

Installation Procedure

    Object Number: 1552485 Size: SH

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

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

    2. Object Number: 1403313 Size: SH
  2. Install the coolant air bleed pipe (307) with seals (308).

    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) with seals (308), if necessary.
  5. Remove the coolant air bleed pipe cover bolts (312), if necessary.

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


    Object Number: 1740027 Size: SH
  6. Install the coolant air bleed hose to the coolant air bleed pipe.
  7. Position the coolant air bleed hose clamp at the coolant air bleed pipe.
  8. Fill the cooling system, if necessary. Refer to Cooling System Draining and Filling .
  9. Install the air cleaner resonator outlet duct. Refer to Air Cleaner Resonator Outlet Duct Replacement.