Coolant Heater Replacement LY7

1. Turn the ignition OFF.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
3. Remove the rear transmission Mount. Refer to Transmission Rear Mount Replacement
4. Disconnect the coolant heater cord from the coolant heater.



5. Remove the coolant heater.

1. Install the coolant heater.
2. Connect the coolant heater cord to the coolant heater.
3. Install the rear transmission Mount. Refer to Transmission Rear Mount Replacement
4. Lower the vehicle.

Coolant Heater Replacement LZ4

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



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

Caution: Refer to Fastener Caution 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 and tighten to 60 N·m (44 lb ft).



3. Connect the engine coolant heater cord (1) 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.

Coolant Heater Replacement LAT

1. Raise and support vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the coolant heater cord (1).



3. Remove the coolant heater bolt.
4. Remove the coolant heater.

1. Install the coolant heater.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the coolant heater bolt and tighten to 10 N·m (89 lb in).



3. Connect the coolant heater cord (1).
4. Lower the vehicle.

Coolant Heater Replacement LE5

1. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.
2. Disconnect the coolant heater cord.



3. Remove the coolant heater bolt.
4. Remove the coolant heater.

1. Install the coolant heater.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the coolant heater bolt and tighten to 10 N·m (89 lb in).



3. Connect the coolant heater cord.
4. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement.