Lenovo ThinkCentre 3493 User Manual page 62

4. Pivot the drive bay assembly upward. Then, pivot the two plastic retaining clips outward to remove
the heat sink fan duct from the failing heat sink and fan assembly.
Figure 34. Removing the heat sink fan duct
5. Disconnect the heat sink and fan assembly cable from the microprocessor fan connector on the system
board. See "Locating parts on the system board" on page 12.
50
ThinkCentre User Guide