Coolant Heater Replacement (LZ4 and LZ9)

Coolant Heater Replacement (LZ4 and LZ9)

Removal Procedure




1. Drain the cooling system. Refer to Draining and Filling Cooling System (LY7, LZ4, LZ9 Static Fill) Draining and Filling Cooling System (GE 47716 Fill) Draining and Filling Cooling System (LE5 Static Fill) .
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.

Installation Procedure




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

Notice: Refer to Fastener Notice .

2. Install the engine coolant heater.

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 Draining and Filling Cooling System (LY7, LZ4, LZ9 Static Fill) Draining and Filling Cooling System (GE 47716 Fill) Draining and Filling Cooling System (LE5 Static Fill) .
6. Inspect for leaks.