Ford Windstar Owner's Manual page 111

Be sure the steering wheel is locked in place. It can only be
adjusted to specific positions. Do not adjust the steering wheel
while the vehicle is in motion.
Speed Control (If equipped)
The speed of the vehicle cannot be automatically controlled until
the vehicle speed is at or above 30 mph (48 km/h).
When driving in hilly terrain, at high elevations, or when
pulling a trailer, it may be desirable to drive in the Overdrive
Lockout mode. This can be done by depressing the O/D button
on the end of the gearshift lever. Driving in this mode helps
prevent excessive transaxle shifting and helps speed control to
maintain speed when going down steep hills.
Use of radio transmitting equipment that is not Federal
Communications Commission (FCC) or in Canada the Canadian
Radio and Telecommunications Commission (CRTC) approved
may cause the speed control to malfunction. Therefore, use only
properly installed FCC (CRTC in Canada) approved radio
transmitting equipment in your vehicle.
NOTE: Do not shift to N (Neutral) when using the speed
control. This will cause the engine to overspeed.
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