Yukon/Denali XL 1500 4WD V8-6.0L VIN U (2004)
8. Disconnect the coolant heater electrical connector (2).
Important: Do not score the surface of the engine block hole when removing the coolant heater.
9. Remove the coolant heater from the engine block.
10. Remove any burrs, sealer, or other rough spots.
Installation Procedure
1. If reusing the old coolant heater, apply thread sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the threads.
Notice: Refer to Fastener Notice in Service Precautions.
2. Install the coolant heater to the engine block.
