Cooling fan of a heat sink assembly

FIG. 1 is a front-right-top perspective view of a seat for a cooling fan of a heat sink assembly, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a right-top-front perspective view thereof, with the broken-line of the heat-sink being for illustrative purposes only and forming no part of the claimed design.