K 1500 Truck 4WD V8-4.8L VIN V (1999)
Engine Block Heater: Service and Repair
Coolant Heater Replacement
REMOVAL PROCEDURE
1. Raise and support the vehicle. Refer to Vehicle Lifting.
2. Drain the cooling system. Refer to Draining and Filling Cooling System.
3. Disconnect the electrical cord from the coolant heater.
IMPORTANT: Do not score the surface of the plug hole when removing the engine coolant heater.
4. Remove the coolant heater from the engine block.
5. Remove any burrs, sealer, paint or other rough spots.
INSTALLATION PROCEDURE
1. If you are using the old heater, apply thread sealant GM P/N 12346004 or equivalent to the threads of the heater.
NOTICE: Refer to Fastener Notice in Service Precautions.
2. Install the coolant heater to the engine block.
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Tighten the coolant heater to 40 Nm (30 ft. lbs.).
3. Connect the coolant heater electrical cord to the heater.
4. Lower the vehicle.
5. Refill the engine coolant. Refer to Draining and Filling Cooling System.
6. Test the cooling system for leaks.
