Lenovo ThinkCentre M72e Hardware Maintenance Manual page 110

To replace the rear fan assembly, do the following:
1. Turn off the computer and disconnect all power cords from electrical outlets.
2. Remove the computer cover. See "Removing the computer cover" on page 84.
3. Locate the rear fan assembly. See "Locating major FRUs and CRUs" on page 71.
4. Disconnect the rear fan assembly cable from the system fan connector on the system board. See
"Locating parts on the system board" on page 73.
5. The rear fan assembly is attached to the chassis by four rubber mounts. Remove the rear fan assembly
by breaking or cutting the rubber mounts and gently pulling the rear fan assembly out of the chassis.
Note: The new rear fan assembly will have four new rubber mounts attached.
Figure 36. Removing the rear fan assembly
6. Install the new rear fan assembly by aligning the new rubber mounts with the corresponding holes in the
chassis and push the rubber mounts through the holes.
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ThinkCentre Hardware Maintenance Manual