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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1343 (ENGINE CONTROL SYSTEM (INTRODUCTION) -- 1.8L (LNK))REPAIR INSTRUCTIONSIDLE AIR CONTROL (IAC) VALVE REPLACEMENTINSTALLATION PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Throttle Body, Coolant Hoses, IAC Valve And Gasket
    GM828869Courtesy of GENERAL MOTORS CORP.
  1. Install a new IAC valve gasket (4).
  2. Install the IAC valve (3) to the throttle body.
    3. NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Install the fasteners that retain the IAC valve.

    Tighten:  Tighten the fasteners to 3.7 N.m (33 lb in).

  4. Connect the two coolant hoses (2) to the IAC valve.
    5. Fig 2: Idle Air Control (IAC) Valve And Electrical Connector
    GM828867Courtesy of GENERAL MOTORS CORP.
  5. Connect the electrical connector (2) to the IAC valve (1).
  6. Refill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.