HPE ProLiant DL360 Gen11 User Manual page 78

b. Lower the heatsink on the processor carrier until the carrier tabs snap into place.
There will be an audible click to indicate that the heatsink is properly latched on the processor carrier.
6. Perform the following verification steps:
a. Verify that the tabs on the processor carrier are securely latched on the heatsink.
HPE ProLiant DL360 Gen11 Server User Guide 78