Remove the following ten screws securing the lower case to the upper case:

• Seven 3 mm Phillips screws.
• Three 13.5 mm Phillips screws.

Using both hands, lift the lower case near the vent to pop it off two clips securing it to the upper case.

Remove the lower case and set it aside.

Use the flat end of a spudger to disconnect the left fan connector from the logic board.

It is useful to twist the spudger axially from beneath the fan cable wires to release the connector.

The fan socket and the fan connector can be seen in the second and third pictures. Be careful not to break the plastic fan socket off the logic board as you use your spudger to lift the fan connector straight up and out of its socket. The layout of the logic board shown in the second picture may look slightly different than your machine but the fan socket is the same.

Remove three T6 Torx screws securing the left fan to the logic board.

Lift the left fan out of the upper case.