Express 1/2 Ton Van V6-4.3L VIN W (1999)
Engine Block Heater: Service and Repair
Coolant Heater Replacement
Removal Procedure
1. Drain the engine coolant.
2. Remove the engine cover.
3. Remove the heater cord from the engine coolant heater (4).
4. Loosen the bolt retaining the engine coolant heater to the block.
5. Remove the engine coolant heater from the engine block.
6. If the vehicle is not originally equipped with an engine coolant heater, remove the coolant jacket plug.
7. Carefully tap the coolant plug near the outer edge. Rotate the coolant plug out of the core plug hole.
Do not score the machined surface of the hole.
8. Grasp the plug with pliers.
9. Pull the plug from the engine block.
10. Clean the core plug hole in order to remove the following substances:
^
Burrs
^
Compound
^
Paint
^
Rough spots
Installation Procedure
1. Coat the O-ring seal (2) and the cleaned surface of the plug opening with water resistant high-temperature grease lubricant GM P/N 9985164 or
the equivalent.
Important: Avoid element contact with the inside walls of the engine block.
2. Tightly push the coolant heater into the engine block.
Notice: Refer to Fastener Notice in Service Precautions.
