Ford 1996 Windstar Manual page 112

In m (OFF), air supply is shut off from all outlets and all
blower motor operation is stopped. Use this setting when
driving through an area where outside air is unpleasant or
dusty.
Operating with the Function Selector Knob in OFF or in
MAX A/C for extended periods of time in cold weather
can result in fog buildup on interior glass surfaces.
This fogging can make it difficult to see the road for safe
driving. Operating in the A/C, Q (PANEL), S
(PANEL/FLOOR), R (FLOOR), P (DEFROST/FLOOR) and
V (DEFROST) positions will help prevent fogging. Adjust the
temperature as necessary for comfort.
In S (PANEL/FLOOR), approximately equal amounts of
airflow are directed to the instrument panel registers and the
floor outlets. This setting will engage the A/C compressor, thus
providing you with an additional A/C mode.
In R (FLOOR), most of the system's air supply is directed to
the floor outlets with a small amount going to the windshield
and side window demisters.
In P (DEFROST/FLOOR), approximately equal amounts of air
are directed to the windshield and floor outlets with a small
amount to the side windows.
NOTE: If outside air temperatures are above approximately
45˚F (7˚C), the P (DEFROST/FLOOR) and V
(DEFROST) positions will also automatically engage
the air-conditioning compressor in order to reduce the
humidity in the air and aid in clearing the inside
glass. Adjust the Temperature Control Knob as
necessary for comfort.
110
RWARNING