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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 (Federal Emissions) >> Removal Procedure

Removal 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.
IMPORTANT: The intake air heater (IAH) relay is part of the glow plug controller on vehicles equipped with federal emissions.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  2. Loosen the outlet duct clamp at the upper intake manifold.
  3. Remove the upper intake manifold cover from the outlet duct.
  4. Remove the upper intake manifold cover.
    5. Fig 1: View Of Upper Intake Manifold Cover, Outlet Duct & Clamp
    GM813243Courtesy of GENERAL MOTORS CORP.
  5. Using a flat bladed screwdriver, disengage the glow plug controller cover clips.
    6. Fig 2: Disengaging Glow Plug Controller Cover Clips
    GM1177261Courtesy of GENERAL MOTORS CORP.
  6. Remove the glow plug controller cover.
    7. Fig 3: Glow Plug Controller Cover
    GM1177263Courtesy of GENERAL MOTORS CORP.
  7. Remove the glow plug controller nuts.
    8. Fig 4: Glow Plug Controller Nuts
    GM1177264Courtesy of GENERAL MOTORS CORP.
  8. Lift the glow plug controller off the studs.
    9. Fig 5: Glow Plug Controller & Studs
    GM1177266Courtesy of GENERAL MOTORS CORP.
  9. Separate the intake heater relay from the glow plug controller housing by inserting a small screwdriver between them while prying the relay assembly outward.
    10. Fig 6: Separating Intake Heater Relay From Glow Plug Controller Housing Using Screwdriver
    GM1177273Courtesy of GENERAL MOTORS CORP.
  10. Slide the intake heater relay outward to disengage it from the glow plug controller housing.
    11. Fig 7: Intake Heater Relay & Glow Plug Controller Housing
    GM1177274Courtesy of GENERAL MOTORS CORP.
    Fig 8: Disengaging Intake Heater Relay Clip Using Screwdriver
    GM1177276Courtesy of GENERAL MOTORS CORP.
  11. Using a flat bladed screwdriver, disengage the intake heater relay clip.
    12. Fig 9: Intake Heater Relay
    GM1177277Courtesy of GENERAL MOTORS CORP.
  12. Remove the intake heater relay.
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