Prepare your computer. See Preparing your computer and removing the computer cover.
Locate the rear fan assembly. See Computer components.
Disconnect the rear fan assembly cable from the system fan connector on the system board. See Parts on the system board.

Align the rubber mounts of the rear fan assembly with the corresponding holes in the chassis. Push the rubber mounts through the holes.

Connect the rear fan assembly cable to the rear fan connector on the system board. See Parts on the system board.
To work with another piece of hardware, go to the appropriate section.
To complete the installation or replacement, go to Completing the parts replacement.