Coolant Heater Replacement L26/L32

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
3. Disconnect the coolant heater cord from the coolant heater.
4. Loosen the bolt at the coolant heater but DO NOT remove the coolant heater bolt.
5. Remove the coolant heater.
6. Remove and clean any burrs, compound, paint, or rough spots from the core plug hole.

1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the following:

•	Engine block heater seal

•	Cleaned surface of the engine block heater hole

2. Install the coolant heater by pushing it tight to the block.



3. Position the engine coolant heater element at the 9 o'clock position (2).

Final installed position between 10 o'clock (1) and 8 o'clock (3) is acceptable.

Notice: Refer to Fastener Notice in the Preface section.

4. Tighten the coolant heater bolt until both locking wings draw tight against the inner wall of the engine block.

Tighten
Tighten the bolt to 2 N·m (17 lb in).

5. Connect the engine coolant heater cord to the engine coolant heater.
6. Fill the cooling system. Refer to Cooling System Draining and Filling .

Coolant Heater Replacement LS4

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
3. Disconnect the coolant heater cord from the coolant heater.
4. Remove the coolant heater (114) and washer (115).
5. Remove and clean any burrs, compound, paint, or rough spots from the core plug hole.

1. Apply a 3.175 mm (0.125 in) bead of sealant, GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the coolant heater.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the coolant heater (114) and washer (115).

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

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