Coolant Heater Replacement L61

1. Disconnect the coolant heater cord (1).



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

1. Install the coolant heater.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the coolant heater bolt.

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




3. Connect the coolant heater cord (1).

Coolant Heater Replacement LX9 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.