GMC 2008 Canyon - Manual (Page 153)

Mode Buttons
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(Recirculation): Press this button to turn the
recirculation mode on or off. An indicator light on the
button comes on to show that the recirculation mode is
activated. This mode recirculates air inside the cabin,
and prevents outside air from coming in the vehicle.
It can be used to cool the air inside the vehicle
more quickly.
Recirculation is only available and should only be used in
the bi-level and vent modes. Recirculation is not available
while in heat, floor, floor/defog, or defrost modes. If your
try to select recirculation while in one of those modes, the
indicator light will not come on or flash.
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(Air Conditioning): Press this button to turn the
air conditioning system on or off. An indicator light on
the button comes on to show that the air conditioning
is activated. When the system is on, this setting
cools and dehumidifies the air entering the vehicle.
The air conditioning will not function if the fan is
turned off.
You may notice a slight change in engine performance
when the air conditioning compressor shuts off and
turns on again. This is normal. The system is designed
to make adjustments to help with fuel economy while
still maintaining the selected temperature.
The air conditioning system removes moisture from the
air, so a small amount of water might drip underneath
the vehicle while idling or after turning off the engine.
This is normal.
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