GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Corvette 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Coolant Heater Replacement

Removal Procedure

    Object Number: 673597 Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling.
  2. Remove the tire and wheel, if necessary. Refer to Tire and Wheel Removal and Installation.
  3. Disconnect the engine coolant heater cord from the engine coolant heater.

    4. Object Number: 673591 Size: SH

    Note: Take care not to damage the surface of the opening in the engine block.

  4. Remove the engine coolant heater.
  5. Clean the opening in the engine block, remove any burrs, sealing compound, or paint.

Installation Procedure

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


    Object Number: 673591 Size: SH
  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.

    3. Caution: Refer to Fastener Caution in the Preface section.

  3. Tighten the engine coolant heater.

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


    Object Number: 673597 Size: SH
  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.
  6. Fill the cooling system. Refer to Cooling System Draining and Filling.