DEF (Defrost)
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, 1995 Ford Cab & Chassis, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
In DEF mode, outside air is routed through system and out defroster outlets. Vacuum is not applied to outside/recirculation, floor/defrost and panel/defrost vacuum motors. Blower motor speed and temperature can be adjusted to desired settings.