The ornamental design for a coolingfan, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
1. Cooling fan
1.1: Front
1.2: Back
1.3: Left
1.4: Right
1.5: Top
1.6: Bottom
1.7: Perspective
Portions of the cooling fan shown in a blue color form a part of the claimed design. The specific color blue shown in the drawings does not form a part of the claimed design.