Mercury 1999 Villager Owner's Manual page 82

Controls and features
To turn speed control off
Press OFF.
Once speed control is switched off, the previously programmed set speed
will be erased.
To set a speed
Press COAST/SET. For speed
control to operate, the speed
control must be ON and the
vehicle speed must be greater
than 48 km/h (30 mph).
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, you may want to shift to the next
lower gear or apply the brakes to reduce your vehicle speed.
If your vehicle slows down more than 16 km/h (10 mph) below your set
speed on an uphill, your speed control will disengage. This is normal.
Pressing RES/ACCEL will re-engage it.
Do not use the speed control in heavy traffic or on roads that
are winding, slippery, or unpaved.
82
CRUISE OFF
RES
ACCEL
CANCEL
COAST
SET