GMC T-Series 2007, Owner'S Manual, Page: 115 / 356

To change the current mode, press one of the
following buttons:
H
(Vent): This mode directs air to the instrument
panel outlets.
)
(Bi-Level): This mode directs about half of
the air to the instrument panel outlets, and
then directs most of the remaining air to the floor
outlets. Some air may be directed toward the
windshield.
6
(Floor): This mode directs most of the air to
the floor outlets with some air directed to the
outboard outlets for the side windows and some
air directed to the windshield.
9
(Fan): The fan has five speed settings: OFF, 1,
2, 3, and 4. Slide the fan lever to OFF to turn the
system off. Outside air will still come out of the floor
outlets whenever the vehicle is moving.
A
(Recirculation): If you press this button, the air
inside the cab will be recirculated. If your vehicle
has air conditioning, using recirculation will give you
maximum cooling. This mode can also be used to
keep outside air, odors and dust from entering your
vehicle.
Recirculation is not available in Defog or Defrost
modes.
A/C (Air Conditioning): If your vehicle has this
feature, you can use your air conditioner by
selecting one of the mode buttons, selecting
a fan speed and pressing the A/C button.
On hot days, open the windows to let hot inside
air escape; then close them. This helps to reduce
the time it takes for your vehicle to cool down.
It also helps the system to operate more efficiently.
For quick cool down on hot days:
1. Select the vent mode.
2. Select the recirculation mode.
3. Select A/C.
4. Select the coolest temperature.
5. Select the highest fan speed.
Using these settings together for long periods of
time may cause the air inside of your vehicle to
become too dry. To prevent this from happening,
after the air in your vehicle has cooled, turn the
recirculation mode off. 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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