Removal of the system fan. when following the keyboard instructions there is no need to unplug it only fold it back to gain access to the fan.
Flip the laptop over. Slide the battery release tab to the right.
Lift the battery out.
Remove the 5 screws holding the keyboard in place.
Follow the black ribbon cable to the connector and gently pull straight up.
Unscrew the 4 captive screws.
Unplug fan from the system and pull it out. The fan unit should slide forward before coming free.