1996 Ford Windstar Owner's Manual - Page 133

Steering Column Controls Windshield Wipers and Washer Variable Interval Wipers Your vehicle has wipers that operate at varying intervals. For example, you can set the interval so they wipe less often in light rain or more often in heavier rain. The wiper delays range from about 1.5 to 20 seconds. Variable interval wiper control To set the interval wipers, rotate the knob at the end of the turn signal lever to the most effective interval. The farther the knob is from the OFF position, the faster the wipers move. Speed Dependent Wipers This feature compensates for the extra moisture that accumulates on your windshield at higher speeds during rain. At higher speeds, the Speed Dependent feature shortens the delay between wipes when you use the variable interval wipers. Delay will automatically adjust at speeds between 10 and 65 mph (16 and 105 km/h). 131