A cooling fan includes a fan housing, a rotor and a stator. When attaching an exterior component to a bumper, an attachment member for a first attaching hole of the bumper fixed to the vehicular main body is detached, and then the attachment member is inserted into a first through-hole of the exterior component and the first attaching hole and fixed, thereby temporarily fixing the exterior component. The method can visually present a user selected item for consumer purchase within a graphical user interface.