Pontiac Montana SV6 2008 Owner's Manual page 175

Outside Air: This mode is automatically selected when
your vehicle is in any mode except maximum air
conditioning.
The right knob can also be used to select defog or
defrost mode. For more information, see "Defogging and
Defrosting" later in this section.
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(Air Conditioning): Press this button to turn the
air conditioning system on or off. When it is pressed, an
indicator light in the button will come on to let you
know that air conditioning is activated.
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.
On hot days, open the windows to let hot inside air
escape; then close them and switch to maximum
air conditioning mode. 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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(Heated Seats): Press this button to turn on the
heated seats. The button on the left controls the driver's
seat and the button on the right controls the passenger's
seat. See Heated Seats on page 1-3 for additional
information.
Defogging and Defrosting
Fog on the inside of windows is a result of high humidity,
or moisture, condensing on the cool window glass.
This can be minimized if the climate control system is
used properly. There are two modes to clear fog or frost
from your windshield. Use the defog mode to clear
the windows of fog or moisture and warm the
passengers. Use the defrost mode to remove fog or
frost from the windshield more quickly.
Turn the right knob to select the defog or defrost mode.
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(Defog): This mode directs air to the windshield
and the floor outlets. When this mode is selected,
the system runs the air conditioning compressor unless
the outside temperature is at or below freezing.
The recirculation mode cannot be selected while in the
defog mode.
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