Ford Mercury Villager 1997 Owner's Manual page 70

NOTE: The compressor will not operate when the outside
temperature is less than about 40° F (4° C).
Rear Passenger Compartment Climate Control System
for Vehicles with Non-Automatic Temperature
Control Systems (If equipped)
If your vehicle is equipped with rear passenger compartment
climate controls, the rear seat occupants can select their own
personal climate comfort level.
The rear seat climate control system is controlled from the main
climate control system on the instrument panel. If the main
system is off, the rear system will also be off. If the rear passenger
compartment climate control lever is set in OFF, the rear
climate controls are turned off. If the lever is set in any of the fan
speed positions (1-4), air will be discharged from the rear seat
vents at the corresponding speed. However, when the lever is set
at REAR, rear seat passengers can control their own fan speed.
The rear passenger compartment climate control system has a fan
speed knob which controls the speed at which air is
discharged from the vents. The vent selection switch determines
whether the air is discharged from the upper vents or the
lower (floor) vents. The temperature control knob controls the air
temperature.
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