Engine Block Heater: Service and Repair

Engine Control Heater:

Coolant Heater (Displaced Position):

Coolant Heater (Locked In Position):

Engine Coolant Heater Cord Routing:

Cord Routing To Engine:

Remove or Disconnect
1. Engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
2. Coolant jacket plug.
If not originally equipped with an engine coolant heater, remove the coolant jacket 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 the bolt.
5. Engine coolant heater from the vehicle.

Clean
- The core plug hole, removing any burrs, compound, paint, or rough spots.

Engine Control Heater:

Coolant Heater (Displaced Position):

Coolant Heater (Locked In Position):

Engine Coolant Heater Cord Routing:

Cord Routing To Engine:

Install or Connect
1. Apply a coating of lubricant to the O-ring seal and the cleaned surface of plug opening in the block. Use a water spray resistant, high-temperature grease lubricant or equivalent.
2. The coolant heater to the block by pressing it tight into the block.

Important
- When installing the heater element. Avoid element contact with the inside walls of the engine block.

3. Tighten the bolt until both locking wings draw tight against inner wall of engine block.

Tighten
- Engine Coolant Heater Retaining Bolt to 1.9 N.m (17 lb in).

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. Refer to Draining and Filling cooling System in Engine Cooling.
- Check the system for leaks.