GMC 2007 Acadia Owner's Manual page 204

Driver's Side Temperature Control
The driver side temperature buttons are used to
adjust the temperature of the air coming through
the system on the driver side. The temperature
can be adjusted even if the system is turned
off. This is possible since outside air will always
flow through the system as the vehicle is moving
forward unless it is set to recirculation mode.
See "Recirculation" later in this section.
Press the + or − buttons to increase or decrease
the temperature. The driver side temperature
display will show the temperature setting
decreasing or increasing.
Passenger's Side Temperature Control
The passenger's temperature buttons can be
used to change the temperature of the air coming
through the system on the passenger side of
the vehicle. The temperature can be adjusted even
if the system is turned off. This is possible since
outside air will always flow through the system
as the vehicle is moving forward unless it is set to
recirculation mode. See "Recirculation" later in
this section.
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Press the + or − buttons to increase or decrease
the temperature. The passenger side display
will show the temperature setting decreasing or
increasing.
The passenger's temperature setting can be
set to match the driver's temperature setting
by pressing the PASS button and turning off
the PASS indicator. When the passenger's
temperature setting is set different than the
driver's setting, the indicator on the PASS
button comes on and both the driver side and
passenger side temperature displays are shown.
Automatic Operation
AUTO (Automatic): When automatic operation is
active the system controls the inside temperature,
the air delivery, and the fan speed.
Use the steps below to place the entire system in
automatic mode:
1. Press the AUTO button.
When AUTO is selected, the display shows
the current temperature(s) selected and AUTO
is on the display. The current delivery mode
and fan speed also display for approximately
5 seconds.