Pontiac Grand Prix 2007 Owner's Manual page 162

(Off): Turn the knob to this position to turn
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the climate control system off. Only the heated
seat and/or rear defrost can be operated when
the fan is off.
Mode
Turn the middle knob to select the
following modes:
H
(Vent) (Outside Air): This mode directs
outside air to the instrument panel outlets. If driving
in city traffic, and the vehicle is stopped and
idling, or the weather is hot, press the recirculation
button. To prevent the air inside the vehicle
from becoming stale, be sure to turn off
recirculation periodically.
)
(Bi-Level): This mode directs half of the air to
the instrument panel outlets, and the remaining
air to the floor outlets. Some air may be directed
toward the windshield. Slightly cooler air is directed
to the instrument panel outlets and warmer air is
directed to the floor outlets.
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(Floor): This mode directs most of the air to
the floor outlets with some air directed toward
the side window outlets and a little air directed to
the windshield.
In this mode, the system will automatically use
outside air. The air conditioning compressor will
be engaged unless the outside temperature is
40°F (4°C) or below.
Recirculation cannot be selected when in this
mode even though the indicator light comes on
when the recirculation button is pressed.
The middle knob on the climate control panel can
also be used to select the defog or defrost mode.