Ford 1996 Windstar Manual page 118

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.
Rear fan control knob
The rear passenger compartment climate control panel has a Fan
Speed Knob which controls the speed (Low, Medium Low,
Medium High, or High) at which air is discharged from the
registers whenever the Rear Control Knob on the front panel
climate control panel is in REAR CTRL.
Front passengers determine the temperature and location of the
airflow for rear passengers by setting the Function Selector
Knob in the front climate control panel in either a heat or A/C
mode.
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