GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 Engine 🢒 Engine Cooling 🢒 Exhaust Gas Recirculation Coolant Hoses/Pipes Replacement

Exhaust Gas Recirculation Coolant Hoses/Pipes Replacement 6.6L (LLY) Engine

Removal Procedure

    Object Number: 1334381 Size: SH
  1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement in Engine Mechanical - 6.6L (LLY).
  2. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls - 6.6L (LLY).

    3. 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.

  3. Loosen the charged air cooler outlet duct to intake hose clamp.
  4. Remove the charged air cooler outlet duct from the intake.

    5. Object Number: 1335476 Size: SH
  5. Remove the tie strap from the electrical harness.
  6. Reposition the engine harness from the air inlet tube.

    7. Object Number: 1335564 Size: SH
  7. Remove the air inlet tube nuts.
  8. Remove the air inlet tube.

    9. Object Number: 1335413 Size: SH
  9. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
  10. Reposition the exhaust gas recirculation (EGR) coolant pipe hose clamp.
  11. Remove the EGR coolant pipe hose.

    12. Object Number: 1335419 Size: SH
  12. Remove the EGR coolant pipe bolts.
  13. Remove the EGR coolant pipe.
  14. Remove and discard the coolant pipe O-ring seal.

Installation Procedure

    Object Number: 1335419 Size: SH
  1. Install a NEW O-ring seal onto the coolant pipe. Lubricate the seal with engine coolant.

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

  2. Install the EGR coolant pipe.
  3. Install the EGR coolant pipe bolts.

    4. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 1335413 Size: SH
  4. Install the EGR coolant pipe hose.
  5. Position the EGR coolant pipe hose clamp.
  6. Connect the ECT sensor electrical connector.

    7. Object Number: 1335564 Size: SH
  7. Install the air inlet tube.
  8. Install the air inlet tube nuts.

    9. Tighten
    Tighten the nuts to 25 N·m (18 lb ft).


    Object Number: 1335476 Size: SH
  9. Position the engine harness to the air inlet tube.
  10. Install a NEW tie strap.

    11. Object Number: 1334381 Size: SH

    Important: Lubricate the end of the duct prior to installation.

  11. Install the charged air cooler outlet duct to the intake.
  12. Tighten the charged air cooler outlet duct to intake hose clamp.

    13. Tighten
    Tighten the clamp to 6 N·m (53 lb in).

  13. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls - 6.6L (LLY).
  14. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement in Engine Mechanical - 6.6L (LLY).