DEF Button
WARNING: This page is about a different car, the 2002 Mercury Grand Marquis and 2002 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Pressing button will display defrost symbol in display window. Outside air will be directed to defrost vents, with a small amount going to floor ducts and side window demisters. A/C clutch will operate if ambient temperature is approximately 50°F (10°C) or more.