GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 658266  Size: SH
  1. Remove the upper intake manifold sight shield using the following procedure:
  2. 1.1. Remove the retaining bolt in the front of the shield.
    1.2. Lift-up on the front of the shield.
    1.3. Lift the shield off the rear bracket.

    Object Number: 664844  Size: SH

    Important: After removing the turbocharger air ducts and hoses, cover the turbocharger openings and the ducts with tape to prevent entry of objects.

  3. If removing the right side, remove the air cleaner outlet duct from the air cleaner and the turbocharger.

  4. Object Number: 664851  Size: SH
  5. In order to access the right side, loosen both charged air cooler outlet duct to intake manifold duct hose clamps.
  6. Important: Do not use a screw driver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting.

  7. Remove the charged air cooler outlet duct to intake hose.

  8. Object Number: 664853  Size: SH
  9. In order to access the left side, loosen the charged air cooler inlet duct to turbocharger clamp.
  10. Important: Do not use a screw driver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting.

  11. Remove the charged air cooler inlet duct to turbocharger cool air outlet hose from the turbocharger.

  12. Object Number: 665386  Size: SH
  13. Remove the heater outlet hose bracket nut (1).
  14. Remove the heater outlet hose bracket bolt (2).
  15. Move the heater hose out of the way.

  16. Object Number: 687021  Size: SH
  17. Disconnect both of the positive crankcase ventilation (PCV) hoses from the valve rocker arm covers.

  18. Object Number: 687093  Size: SH
  19. Disconnect the oil separator oil drain hose form the engine block.

  20. Object Number: 687057  Size: SH
  21. Remove the nylon strap from the PCV oil separator.
  22. Remove the oil separator assembly from the mounting bracket. Lift up on the oil separator to slide off of the bracket.

  23. Object Number: 687065  Size: SH
  24. Disconnect the PCV hoses to the oil separator and the tee connector.
  25. Remove the oil separator and hoses.
  26. Inspect the all of the PCV hoses for damage.
  27. Inspect the oil separator for cracks or damage.
  28. Replace any parts found with damage.

Installation Procedure


    Object Number: 687065  Size: SH
  1. Connect the PCV hose to the oil separator and the tee connector.

  2. Object Number: 687057  Size: SH
  3. Install the oil separator assembly to the mounting bracket.
  4. Install a nylon strap for the oil separator.

  5. Object Number: 687093  Size: SH
  6. Connect the oil separator oil drain hose to the engine block.

  7. Object Number: 687021  Size: SH
  8. Connect both of the PCV hoses to the valve rocker arm covers.

  9. Object Number: 665386  Size: SH
  10. Position the heater hose.
  11. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  12. Install the heater outlet hose bracket nut (1).
  13. Tighten
    Tighten the nut to 9 N·m (80 lb in).

  14. Install the bolt (2) retaining the heater outlet hose to the generator bracket.
  15. Tighten
    Tighten the heater hose bracket bolt to 25 N·m (18 lb ft).


    Object Number: 664853  Size: SH
  16. Install the charged air cooler inlet duct to turbocharger cool air outlet hose to the turbocharger.
  17. Position the clamp as shown for proper clearance.
  18. Tighten
    Tighten the clamp to 6 N·m (53 lb in).


    Object Number: 664851  Size: SH
  19. Install the charged air cooler outlet duct to intake manifold duct hose.
  20. The hose is marked DUCT which connects to the charged air cooler outlet duct.

    The hose is marked ENG which connects to the intake manifold duct.

    Align the marks on the hose with the alignment marks on the pipe and duct.

  21. Position the clamps as shown for proper clearance.
  22. Tighten
    Tighten the clamps to 6 N·m (53 lb in).


    Object Number: 664844  Size: SH
  23. Install the air cleaner outlet duct to the air cleaner.

  24. Object Number: 664847  Size: SH
  25. Install the air cleaner outlet duct to turbocharger. Align the duct to the air cleaner.
  26. Tighten
    Tighten the air cleaner outlet duct clamps to 6 N·m (53 lb in).


    Object Number: 658266  Size: SH
  27. Install the upper intake manifold sight shield.
  28. Tighten
    Tighten the upper intake manifold shield bolt to 9 N·m (80 lb in).