Ford Windstar Owner's Manual page 134

Opening the liftgate
Make certain that you close the liftgate door before driving your
vehicle. Possible damage may occur to the liftgate door lift
cylinders and attaching hardware if the liftgate door is not
closed prior to driving.
Make sure that the liftgate door and/or window are
closed to prevent exhaust fumes from being drawn into
the vehicle. This will also prevent passengers and cargo
from falling out. If you must drive with the liftgate door
or window open, keep the vents open so outside air
comes into the vehicle.
Controls and Features
R WARNING
133