an automobile window ventilator in which a fan is mounted to the window via panels . the fan causes the forced exchange of hot interior air with cooler ambient air , which fan is used especially in the parked state of the vehicle . the fan is powered from the d . c . voltage source of the vehicle , and is readily convertible to a swiveling cooling fan for cooling persons in the interior of the vehicle via an adapting structure . the panels snugly receive the window pane therebetween , which panels are held in place in the channels of the window frame via l - shaped clips . the control of the fan is automatic via a thermal switch sensing the interior temperature of the vehicle . the upper panel may be used for mounting a conventional static vent screen . a closure lid for closing off or exposing the dynamic vent is provided , which is adjustably positionable from the interior of the vehicle . an anti - tampering screen mesh denies unwanted access to the interior of the vehicle via the window mounting the dynamic vent .