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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 667 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSCOOLANT HEATER REPLACEMENT (3.8L)INSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Installation Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Apply a coat of GM P/N 12346004 thread sealant with Teflon or equivalent to the O-ring and clean the surface of the plug opening.
  2. Install the coolant heater by pushing tight to the block.
    Fig 1: Coolant Heater
    G01703924Courtesy of GENERAL MOTORS CORP.
  3. Install the coolant heater so the element is positioned as shown.
    NOTE: Refer to FASTENER NOTICE .
  4. Tighten the coolant heater bolt until both locking wings draw tight against the inner wall of the engine block.

    Tighten 

    Tighten the coolant heater bolt to 2 N.m (18 Ib in).

  5. Connect the coolant heater cord to the coolant heater.
  6. Fill the cooling system. Refer to Draining and Filling Cooling System .
  7. Inspect for leaks.
    Fig 2: Position For Coolant Heater Element Installation
    G01703925Courtesy 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.