Honda 2012 Pilot Owner's Manual page 211

Fan Control
Press the button to increase
the fan speed and airflow. Press the
button to decrease it.
Air Conditioning (A/C) Button
This button turns the air
conditioning on and off. You will see
A/C ON or A/C OFF in the display.
When you turn the A/C off, the
system cannot regulate the inside
temperature if you set the
temperature control below the
outside temperature.
Recirculation Button
When the indicator in the button is
on, air from the vehicle's interior is
sent through the system again.
When the indicator is off, air is
brought in from the outside of the
vehicle (fresh air mode).
The outside air intakes for the
climate control system are at the
base of the windshield. Keep this
area clear of leaves and other debris.
Climate Control System
The system should be left in fresh
air mode under almost all conditions.
Keeping the system in recirculation
mode, particularly with the A/C off,
can cause the windows to fog up.
Switch to recirculation mode when
driving through dusty or smoky
conditions, then return to fresh air
mode.
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