There are three internal fans located in the Alienware M18x laptop. This guide will demonstrate how to go about removing said fans.
Turn the computer over.
Slide the battery latch over and lift the battery out.
Unscrew the four indicated screws with a J000 screwdriver.
Use the plastic pryer tool to lift the bottom cover off.
With the back cover removed, locate the desired fan to replace.
Use a J000 screwdriver to loosen the screws that secure the fan(s).
The fan will be connected to the motherboard by a cable. Use plastic tweezers to gently unplug this connection.
The fan is now fully disconnected from the computer. Gently remove the fan by lifting upwards.