The 1971 Super Beetle was the first car that received a fresh air ventilation system with a two-speed fan, shown here. Remove the fresh air hoses that lead to the two ducts into the cabin. Three Phillip's head screws and a hex nut at the bottom free the box, but you still have to undo the wiring and the two Phillip's head screws that holds the control bracket to the back of the dash. Don't forget to remove the knobs, of course.