Coolant Heater Replacement 3.6L

Warning: Refer to Battery Disconnect Warning 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).




Note: 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

Warning: Refer to Battery Disconnect Warning 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.

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

Danger: To avoid any vehicle damage, serious personal injury or death when major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.

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



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




Note: 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.

Caution: Refer to Fastener Caution in the Preface section.

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