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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1186 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSCOOLANT HEATER 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 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Important:  The engine coolant heater sealing washer may be reused if not bent, scored or otherwise damaged.

  1. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the engine coolant heater sealing washer.
  2. Insert the engine coolant heater.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  3. Tighten the engine coolant heater.

    Tighten 

    Tighten the engine coolant heater to 40 N.m (30 lb ft).

    Fig 1: Engine Coolant Heater
    G01971829Courtesy of GENERAL MOTORS CORP.
  4. Install the engine coolant heater cord to the engine coolant heater.
  5. Install the tire and wheel, if necessary. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION in Tires and Wheels.
  6. Fill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
    Fig 2: Installing Engine Coolant Heater Cord To Engine Coolant Heater
    G01971830Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

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.