GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Intake Air Heater Replacement

Removal Procedure

    Object Number: 1864643 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Reposition the engine wiring harness boot (1).
  3. Remove the engine wiring harness nut at the intake air heater (IAH).
  4. Remove the engine wiring harness from the IAH.
  5. Remove the intake air valve. Refer to Air Intake Pipe Replacement .

    6. Object Number: 1864644 Size: SH
  6. Remove the IAH and remove and discard the IAH gasket.

Installation Procedure

    Object Number: 1864644 Size: SH
  1. Position a NEW IAH gasket to the intake manifold tube and position the IAH to the intake manifold tube.

    2. Object Number: 1864643 Size: SH
  2. Install the intake air valve. Refer to Air Intake Pipe Replacement .
  3. Install the engine wiring harness to the IAH.

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

  4. Install the engine wiring harness nut at the IAH.

    5. Tighten
    Tighten the nut to 4 N·m (34 lb in).

  5. Position the engine wiring harness boot (1).
  6. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .