Ford 2015 EXPEDITION Owner's Manual page 138

F. REAR (temperature control): Press to turn on the auxiliary climate
control system and to set the desired rear temperature with the front
control. The rear temperature is the same as the front temperature when
only the center rear temperature light (REAR) is lit. The rear
temperature is different from the front temperature when more than one
rear temperature light (REAR) is lit.
G. Heated rear window: Turns the heated rear window on and off. See
Heated windows and mirrors later in this chapter for more
information.
H. Recirculated air: Press the button to switch between outside air and
recirculated air. When you select recirculated air, the air currently in the
passenger compartment recirculates. This may reduce the time needed
to cool the interior (when used with A/C) and may reduce unwanted
odors from entering your vehicle.
Note: Recirculated air may turn off automatically (or be prevented
from turning on) in all airflow modes except MAX A/C to reduce risk
of fogging.
I. A/C: Press the button to switch the air conditioning compressor on or
off. Use air conditioning with recirculated air to improve cooling
performance and efficiency.
Climate Control 137