Engine Coolant Heater

Engine Coolant Heater To The Engine Block:

Engine Coolant Heater (Locked-In Position):

Engine Coolant Heater (Displaced Position):

Cord Routing (Body):

Cord Routing (Engine):

REMOVE OR DISCONNECT
1. Engine coolant.
2. Engine core plug.
^ If not originally equipped with an engine coolant heater, remove the engine core plug. Carefully tap it near its outer edge, causing it to rotate out of the hole. Do not score the machined surface of the hole. Grasp with pliers and pull to remove
3. Cord from engine coolant heater.
4. Loosen bolt.
5. Engine coolant heater.
Clean
^ Core plug hole, removing any burrs, compound paint, or rough spots.

Engine Coolant Heater (Displaced Position):

Cord Routing (Body):

Cord Routing (Engine):

INSTALL OR CONNECT
1. Apply a coating of lubricant to the 0-ring seal and the cleaned surface of plug opening in the block. Use a water spray resistant, high-temperature grease lubricant GM P/N 9985164 or equivalent.
2. The coolant heater and push tight to the block.

Engine Coolant Heater To The Engine Block:

Important
^ Install the heater element in the correct direction to avoid element contact to the inside walls of the engine block as shown.

NOTE: The element must not touch the engine block inner wall in the Installed position or damage to the engine block and the heater could result.

Engine Coolant Heater (Locked-In Position):

3. Tighten bolt until both locking wings draw tight against inner wall of engine block.
4. Heater cord to the coolant heater and route heater cord.

Important
^ The heater cord must not touch the engine hot pipes, manifold, or any moving parts.

5. Engine coolant.