Coolant Heater Replacement

Coolant Heater Replacement (RPO LS4)

Removal Procedure





1. Drain the cooling system.
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.

Installation Procedure





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

2. Notice: Refer to Fastener Notice in Service Precautions.
Install the coolant heater (114) and washer (115).
^ Tighten the coolant heater to 50 Nm (37 ft. lbs.).
3. Connect the coolant heater cord to the coolant heater.
4. Lower the vehicle.
5. Fill the cooling system.