GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 2WD 🢒 Engine 🢒 Engine Electrical 🢒 Intake Air Heater Replacement

Removal Procedure

    Object Number: 1871113 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  3. Remove the exhaust gas recirculation (EGR) valve motor. Refer to Exhaust Gas Recirculation Valve Motor Replacement .
  4. Remove the upper intake manifold brace bolts and brace.

    5. Object Number: 1871193 Size: SH
  5. Remove the engine wiring harness clip (1) from the intake manifold tube.
  6. Remove the engine wiring harness clip bolt (2) from the intake manifold tube.

    7. Object Number: 1871195 Size: SH
  7. Disconnect the engine wiring harness electrical connector (1) from the intake air heater (IAH).
  8. Disconnect the engine wiring harness electrical connector (2) from the manifold absolute pressure (MAP) sensor.
  9. Reposition the engine wiring harness branches out of the way.

    10. Object Number: 1871196 Size: SH
  10. Open the IAH harness lead cover (2).
  11. Remove the engine wiring harness lead nut (1) from the IAH stud.
  12. Remove the engine wiring harness lead (3) from the IAH stud.

    13. Object Number: 1871197 Size: SH
  13. Remove the IAH bolts (1) and nuts (2).
  14. Remove the intake manifold front tube and IAH from the intake manifold rear tube.
  15. Remove the IAH (3) from the intake manifold front tube studs.
  16. Remove and discard the IAH gasket.

Installation Procedure

    Object Number: 1871197 Size: SH
  1. Install a NEW IAH gasket.
  2. Install the IAH (3) to the intake manifold front tube studs.
  3. Install the intake manifold front tube and IAH to the intake manifold rear tube.

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

  4. Install the IAH bolts (1) and nuts (2).

    5. Tighten
    Tighten the bolts/nuts to 20 N·m (15 lb ft).


    Object Number: 1871196 Size: SH
  5. Install the engine wiring harness lead (3) to the IAH stud.
  6. Install the engine wiring harness lead nut (1) to the IAH stud.

    7. Tighten
    Tighten the nut to 10 N·m (89 lb in).

  7. Close the IAH harness lead cover (2).

    8. Object Number: 1871195 Size: SH
  8. Position the engine wiring harness branches.
  9. Connect the engine wiring harness electrical connector (2) to the MAP sensor.
  10. Connect the engine wiring harness electrical connector (1) to the IAH.

    11. Object Number: 1871193 Size: SH
  11. Install the engine wiring harness clip (1) to the intake manifold tube.
  12. Install the engine wiring harness clip bolt (2) to the intake manifold tube.

    13. Tighten
    Tighten the bolt to 4 N·m (35 lb in).


    Object Number: 1871113 Size: SH
  13. Install the upper intake manifold brace and bolts.

    14. Tighten
    Tighten the bolts to 24 N·m (18 lb ft).

  14. Install the EGR valve motor. Refer to Exhaust Gas Recirculation Valve Motor Replacement .
  15. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement .
  16. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .