Ford Windstar Owner's Manual page 91

The air conditioner may be used to cool the outside air being
drawn into your vehicle, but using recirculated air is more
economical and cools your vehicle more quickly.
Cooling your vehicle with outside air
Cooling your vehicle with air conditioned outside air is quieter
but less economical than using recirculated air. It also has less
cooling capacity.
To cool your vehicle with outside air:
Turn the Function Selector Knob to the A/C or S
1.
(PANEL/FLOOR).
Turn the Temperature Control Knob to COOL.
2.
Turn the Fan Speed Knob to the position of your choice.
3.
Make sure that the registers in the instrument panel are open
4.
and adjusted to the positions of your choice.
During periods of high humidity, vapor may be emitted from
the air outlets when using the A/C with outside air. Correct
this by switching the Function Control Knob to MAX A/C.
Improving fuel economy
Whenever you turn on the air conditioning, your vehicle uses
more fuel because the air conditioning compressor is running.
To get better fuel economy while cooling your vehicle, do not
use the air conditioner on mild days. Instead, set the function
control knob to Q (PANEL) and turn the temperature control
knob to COOL.
Operating tips
To vary the temperature inside your vehicle, move the
Temperature Control Knob toward WARM (red) for warmer
temperatures and toward COOL (blue) for cooler temperatures.
The Temperature Control Knob setting determines the
temperature of the air being discharged from the system in all
operating modes (heating or A/C).
90