K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
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.
See: Service Precautions/Vehicle Damage Warnings/Fastener Notice
2. Install the coolant heater to the engine block.
Tighten the coolant heater to 50 Nm (37 ft. lbs.).
