GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Tilt the cab. Refer to Cab Tilting .
  2. Loosen both charged air cooler outlet duct to intake manifold tube hose clamps.

  3. Object Number: 1253435  Size: SH

    Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damaged. Loosen the hose by twisting.

  4. Remove the hose from the charged air cooler outlet duct to intake manifold tube.
  5. Remove the charged air cooler outlet hose and pipe assembly from the vehicle.
  6. Disassemble the hose and pipe assembly as required.

  7. Object Number: 1253441  Size: SH

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

  8. Loosen the charged air cooler inlet duct to turbocharger clamp.
  9. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting.

  10. Remove the charged air cooler inlet duct to turbocharger cool air outlet hose from the turbocharger.
  11. Loosen the charged air cooler inlet duct to charged air cooler clamp.
  12. Remove the charged air cooler inlet hose and pipe assembly from the vehicle.
  13. Disassemble the hose and pipe assemblies as required.
  14. Inspect the hoses for cuts or tears.
  15. Inspect the pipes for damage.
  16. Replace the hose or pipe if damage is found.

Installation Procedure

  1. Remove the tape from the openings.

  2. Object Number: 1253435  Size: SH
  3. Install the charged air cooler inlet hose to the pipe. The hose is marked for correct installation.
  4. Install the hose clamps on the charged air cooler inlet hose but do not tighten.
  5. Install the charged air cooler inlet hose to the charged air cooler aligning the marks on the hoses.
  6. Install the upper hose on the charged air cooler inlet pipe.
  7. Install the clamps on the hose assembly but do not tighten.
  8. Remove the tape from the turbo openings.

  9. Object Number: 1253441  Size: SH
  10. Install the charged air cooler inlet duct to turbocharger cool air outlet hose to the turbocharger.
  11. Notice: Refer to Fastener Notice in the Preface section.

  12. Position all of the clamps as shown for proper clearance.
  13. Tighten
    Tighten all the hose clamps to 6 N·m (53 lb in).

  14. Install the lower hose on the charged air cooler outlet pipe. The hose is marked for correct installation.
  15. Install the clamps on the outlet hose but do not tighten.
  16. Install the charged air cooler outlet duct to intake manifold tube hose.
  17. 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 tube.

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

  18. Position all of the clamps as shown for proper clearance.
  19. Tighten
    Tighten the charged air cooler hose clamps to 6 N·m (53 lb in).

  20. Inspect the routing of the charged air cooler ducts to ensure they are not contacting anything. Adjust the ducts if necessary.