The old fan can be removed by sliding it out of the fan/heat sink assembly.

Note: You can use canned air to clean out the fan vents for better CPU cooling.

Insert the new fan into the fan slot in the fan/heat sink assembly. Put the assembly back together with the micro screws.

Before reassembly, make sure your new fan freely rotates within its housing.

CAUTION: Do not over-tighten the screws!