Ford Windstar Owner's Manual page 92

Controls and Features
When stopped in traffic for long periods of time in hot weather,
place the automatic transaxle gearshift selector lever in Park (P)
or in Neutral (N). This aids in engine cooling and air
conditioner efficiency. (If the engine overheats, turn the
Function Selector Knob to Q (PANEL) and turn the
Temperature Control Knob to WARM.)
When your vehicle's engine is operated at full throttle, the air
conditioner compressor will automatically be turned off to allow
maximum engine power. This may occur during passing or
when climbing steep grades. The compressor will return to
normal operation within a few seconds after full throttle is no
longer needed.
NOTE: The compressor will not operate when the outside
temperature is less than about 45˚F (7˚C).
Rear Climate Control System (If equipped)
If your vehicle is equipped with a rear climate control system,
the rear seat occupants can select their own personal fan speed
settings.
The rear seat climate control system is controlled from the main
climate control system on the instrument panel. If the rear
passenger compartment climate control knob in the front climate
control panel is set in OFF, the fan in the rear seat climate
control system will also be off. If the knob is set in any of the
fan speed positions (Medium Low, Medium High, or High), air
will be discharged from the rear seat vents at the corresponding
speed. However, when the knob is set at REAR CTRL, rear seat
passengers can control their own fan speed.
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