HP Pavilion x360 Maintenance And Service Manual page 54

3. Remove the heat sink (2).
NOTE: The thermal material must be thoroughly cleaned from the surfaces of the heat sink and the system
board each time the heat sink is removed. Thermal paste is used on the processor (1) and the heat sink
section (2) that services it.
Reverse this procedure to install the heat sink.
48 Chapter 5 Removal and replacement procedures