GMC 2007 Acadia - Manual (Page 207)

This mode keeps outside air from entering the
vehicle. It can be used to reduce outside air and
prevent odors from entering your vehicle.
Recirculation can also help cool the air inside your
vehicle more quickly once the temperature inside
the vehicle is less than the outside temperature.
The recirculation mode cannot be used with floor,
defrost, or defogging modes. If you try to select
recirculation in one of those modes, the indicator
flashes three times and turns off. The air
conditioning compressor also comes on when this
mode is activated. While in recirculation mode the
windows may fog when the weather is cold and
damp. To clear the fog, select either the defog or
defrost mode and increase the fan speed.
Press the button again to turn off the recirculation
mode. It automatically turns off when the engine is
turned off and must be re-selected when the engine
is turned on again.
Air Conditioning
#
(Air Conditioning): Press this button to turn
the air conditioning (A/C) compressor on and off.
When air conditioning is selected, an indicator light
comes on to let you know that the air conditioning
has been activated.
The air conditioning compressor does not work
when outside temperatures fall below 40°F (4°C).
Pressing this button when the outside temperature
is too cool makes the air conditioning indicator flash
three times and turn off to let you know the air
conditioning mode is not available. If the air
conditioning is on and the outside temperature
drops below a temperature which is too cool for air
conditioning to be effective, the air conditioning light
turns off to show that the air conditioning mode has
been canceled.
On hot days, open the windows long enough to let
hot inside air escape. This helps to reduce the
time it takes for your vehicle to cool down. It also
helps the system to operate more efficiently.
The air conditioning system removes moisture
from the air, so you may sometimes notice a
small amount of water dripping underneath your
vehicle while idling or after turning off the
engine. This is normal.
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