Coolant Heater Replacement LE5

1. Disconnect the coolant heater cord.



2. Remove the coolant heater bolt.
3. Remove the coolant heater.

1. Install the coolant heater.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the coolant heater bolt.

Tighten
Tighten the bolt to 10 N·m (89 lb in).




3. Connect the coolant heater cord.

Coolant Heater Replacement LZ4 and LZ9

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Disconnect the engine coolant heater cord from the engine coolant heater.



3. Remove the engine coolant heater.
4. Clean the engine coolant heater opening.

Notice: Refer to Fastener Notice in the Preface section.




1. Apply sealer GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the engine coolant heater, if necessary.
2. Install the engine coolant heater.

Tighten
Tighten the coolant heater to 60 N·m (44 lb ft).




3. Connect the engine coolant heater cord to the engine coolant heater.
4. Lower the vehicle.
5. Fill the cooling system. Refer to Cooling System Draining and Filling .
6. Inspect for leaks.