Ford 1998 Windstar Owner's Manual page 102

To Turn Speed Control Off
Press OFF,
Turn off the vehicle ignition.
Once speed control is switched off, the previously programmed
set speed will be erased.
To Turn Speed Control On
Press ON
To Set a Speed
Press SET ACCEL. For speed control to operate, the speed
control must be ON and the vehicle speed must be greater than
30 mph (48 km/h).
If you drive up or down a steep hill, your vehicle speed may
vary momentarily slower or faster than the set speed. This is
normal.
Speed control cannot reduce the vehicle speed if it increases
above the set speed on a downhill. If your vehicle speed is
faster than the set speed while driving on a downhill in j
(Overdrive), you may want to shift to the next lower gear to
reduce your vehicle speed.
If your vehicle slows down more than 10 mph (16 km/h) below
your set speed on an uphill, your speed control will disengage.
This is normal. Pressing RESUME will re-engage it.
To keep your vehicle under control, do not use speed
control in heavy traffic or on roads that are winding,
slippery, or unpaved.
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