Coolant Heater Replacement

Coolant Heater Replacement (LNJ) (3.4L)

Removal Procedure




1. Drain the engine coolant. Refer to Cooling System Draining and Filling (LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ Static Fill) (Service and Repair)Cooling System Draining and Filling (LY7 Static Fill) (Service and Repair).
2. Remove the coolant heater cord from the heater.

Note: Do not score the surface of the engine block hole when removing the coolant heater.

3. Remove the coolant heater from the block.

Installation Procedure




1. Remove any burrs, sealer, paint or other foreign material from the threads/sealing surface of the engine block and from the old coolant heater if the heater is to be reused.
2. If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.

Caution: Refer to Component Fastener Tightening Caution (Component Fastener Tightening Caution).

3. Install the coolant heater to the engine block. Tighten the coolant heater to 50 Nm (37 lb ft).
4. Install the coolant heater cord to the heater.
5. Fill the cooling system. Refer to Cooling System Draining and Filling (LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ Static Fill) (Service and Repair)Cooling System Draining and Filling (LY7 Static Fill) (Service and Repair).