Coolant Heater Replacement 3.6L Engine

Caution: Refer to Battery Disconnect Caution in the Preface section.

1. Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection.
2. Drain the cooling system. Refer to Cooling System Draining and Filling.
3. Remove the engine covers. Refer to Engine Cover Replacement.



4. Disconnect the coolant heater cord electrical connector (1).




Important: Do not score the surface of the engine block hole (2) when removing the coolant heater (1).

5. Remove the coolant heater (1) from the engine block (2).

1. Install the coolant heater (1) to the engine block (2).



2. Connect the coolant heater cord electrical connector (1).
3. Fill the cooling system. Refer to Cooling System Draining and Filling.
4. Install the engine covers. Refer to Engine Cover Replacement.
5. Connect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection.

Coolant Heater Replacement 6.0L Engine

Caution: Refer to Battery Disconnect Caution in the Preface section.

1. Disconnect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection.
2. Drain the cooling system. Refer to Cooling System Draining and Filling.

Caution: Refer to Safety Glasses Caution in the Preface section.

Caution: Refer to Vehicle Lifting Caution in the Preface section.

3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.



4. Disconnect the coolant heater cord electrical connector (1).




Important: Do not score the surface of the engine block hole (2) when removing the coolant heater (1).

5. Remove the coolant heater (1) from the engine block (2).

1. If reusing the old coolant heater (1), apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the coolant heater (1) to the engine block (2).

Tighten
Tighten the coolant heater to 50 N·m (37 lb ft).




3. Connect the coolant heater cord electrical connector (1).
4. Lower the vehicle.
5. Fill the cooling system. Refer to Cooling System Draining and Filling.
6. Connect the battery ground cable. Refer to Battery Negative Cable Disconnection and Connection.