Lenovo THINKCENTRE 6396 - Manual (Page 108)

10. To install the new system fan assembly into the chassis, align the open holes
in the system fan assembly with the long rubber mounts in the chassis. Pull
the rubber mounts through the holes in the system fan assembly until the
system fan is in place.
11. Once the system fan assembly is secure, you should remove the extra rubber
for the mounts.
12. Connect the system fan assembly cable to the system fan connector on the
system board.
13. Replace the hard disk drive, if it was removed.
14. Go to “Completing the FRU replacement” on page 103.
102 Hardware Maintenance Manual