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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 976 (Engine Controls - 6.6L (Lb7) (Introduction)) >> Repair Instructions >> Intake Air Heater (IAH) Relay Replacement (California Emissions) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the IAH relay.
    2. Fig 1: IAH Relay
    GM1198942Courtesy of GENERAL MOTORS CORP.
  2. Install the IAH relay assembly to the housing.
    3. Fig 2: IAH Relay Assembly & Housing
    GM1198940Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install the IAH relay controller nuts and washers.

    Tighten:  Tighten the nuts to 5 N.m (44 lb in).

    4. Fig 3: IAH Relay Controller Nuts And Washers
    GM1198938Courtesy of GENERAL MOTORS CORP.
  4. Install the IAH relay controller cover.
    5. Fig 4: IAH Relay Controller Cover
    GM1198936Courtesy of GENERAL MOTORS CORP.
  5. Install the IAH relay controller.
  6. Install the IAH relay controller bolts (2).

    Tighten:  Tighten the bolts to 20 N.m (15 lb ft).

  7. Install the battery cables and nuts to the IAH relay controller.

    Tighten:  Tighten the nuts to 5 N.m (44 lb in).

    8. Fig 5: Battery Cable Boots & IAH Relay Controller Bolts
    GM1198934Courtesy of GENERAL MOTORS CORP.
  8. Reposition the battery cable boots (1).
    9. Fig 6: Battery Cable Boots
    GM1198931Courtesy of GENERAL MOTORS CORP.
  9. Connect the IAH relay electrical connector (3).
  10. Connect the engine harness connector (2).
    11. Fig 7: Engine Harness Electrical Connector & IAH Relay Electrical Connector
    GM757209Courtesy of GENERAL MOTORS CORP.
  11. Install the upper intake manifold cover.
  12. Install the upper intake manifold cover to the outlet duct.
  13. Tighten the outlet duct clamp at the upper intake manifold cover.

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

    14. Fig 8: View Of Upper Intake Manifold Cover, Outlet Duct & Clamp
    GM813243Courtesy of GENERAL MOTORS CORP.
  14. Connect the negative battery cables. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
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