Coolant Heater Replacement

Coolant Heater Replacement (6.6L)

Removal Procedure





1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill) (Service and Repair)Cooling System Draining and Filling (Vac N Fill) (Service and Repair) .
2. Remove the right front tire and wheel. Refer to Tire and Wheel Removal and Installation .
3. Disconnect the engine coolant heater cord.




4. Loosen the coolant heater bolt.
5. Remove the engine coolant heater from the engine block.
6. Do not score the machined surface of the hole.
7. Grasp the plug with pliers.
8. Pull the plug from the engine block.
9. 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 and the cleaned surface of the plug opening with water resistant high-temperature grease lubricant GM P/N 1052196 (Canadian P/N 5264008), or the equivalent.

Important: Avoid element contact with the inside walls of the engine block.


2. Align the coolant heater element to point towards the top of the engine.
3. Tightly push the coolant heater into the engine block.





Notice: Refer to Fastener Notice .

4. Tighten the bolt on the engine coolant heater until both of the locking wings draw tightly against the inner wall of the engine block.

Tighten the bolt to 2 N.m (18 lb in).






Notice: The heater cord must not touch the engine, hot pipes, manifold, or any moving parts. Route the cord to the left front of the engine compartment securing with tie straps as necessary to prevent damage.

5. Connect the heater cord to the coolant heater.
6. Install the right front tire and wheel. Refer to Tire and Wheel Removal and Installation .
7. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill) (Service and Repair)Cooling System Draining and Filling (Vac N Fill) (Service and Repair) .
8. Inspect for coolant leaks.