Coolant Heater Replacement
Coolant Heater ReplacementRemoval Procedure
1. Drain the cooling system.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
3. Disconnect the coolant heater electrical connector (2).
Important: Do not score the surface of the engine block hole when removing the coolant heater.
4. Remove the coolant heater from the engine block.
5. Remove any burrs, sealer, paint or other rough spots.
Installation Procedure
1. If re-using the old coolant heater, apply thread sealant GM P/N 12346004 or equivalent to the threads.
Notice: Refer to Fastener Notice in Service Precautions.
2. Install the coolant heater to the engine block.
^ Tighten the coolant heater to 50 Nm (37 ft. lbs.).
3. Connect the coolant heater electrical connector (2).
4. Lower the vehicle.
5. Fill the cooling system.