2008 GMC ACADIA air condition

AUX (Auxiliary):Press this button to turn the
rear heating and air conditioning on. SeeRear Air
Conditioning and Heating System on page 3-36or
Rear Air Conditioning and Heating System and
Electronic Climate Controls on page 3-38.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
<(Rear Window Defogger):Press this button on the
right knob to turn the rear window defogger on or off.
The rear window defogger stays on about 10 minutes
after the button is pressed, before turning off. The
defogger can also be turned off by pressing the button
again or by turning off the engine. Do not drive the
vehicle until all the windows are clear.
If your vehicle has heated outside rearview mirrors, the
mirrors heat to help clear fog or frost from the surface of
the mirror when the rear window defog button is pressed.
Notice:Do not use anything sharp on the inside of
the rear window. If you do, you could cut or damage
the warming grid, and the repairs would not be
covered by your warranty. Do not attach a temporary
vehicle license, tape, a decal or anything similar to
the defogger grid.
Dual Automatic Climate Control
System
The heating, cooling, and ventilation in your vehicle
can be controlled with this system. Your vehicle also
has a ow-through ventilation system described later
in this section.
Different temperature settings can be selected for the
driver and all passengers.
Display Function
Each time the temperature, mode, or fan control buttons
are pressed the display shows that function along with
the inside temperature setting. The display automatically
reverts back to the outside temperature display after a
short delay.
3-29

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 ow 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 ow 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 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.
When AUTO is selected, the air conditioning
operation and air inlet are automatically controlled.
The air conditioning compressor runs when the
outside temperature is over about 40°F (4°C).
The air inlet is normally set to outside air. If it is
hot outside, the air inlet can automatically switch
to recirculate inside air to help quickly cool
down your vehicle. The light comes on the
recirculation button while in recirculation.
3-30

2. Set the driver’s and passenger’s temperature.
To nd your comfort setting, start with a 73°F (22°C)
temperature setting and allow about 20 minutes
for the system to regulate. Use the driver’s or
passenger’s temperature buttons to adjust the
temperature setting as necessary. If you choose
the temperature setting of 60°F (15°C), the system
remains at the maximum cooling setting. If you
choose the temperature setting of 90°F (32°C),
the system remains at the maximum heat setting.
Choosing either maximum setting will not cause
the vehicle to heat or cool any faster.
Do not cover the solar sensor located on the top of
the instrument panel near the windshield. This sensor
regulates air temperature based on sun load and also
turns on your vehicle’s headlamps. For more information
on the solar sensor, see “Sensors” later in this section.
To avoid blowing cold air in cold weather, the system
delays turning on the fan until warm air is available.
The length of delay depends on the engine coolant
temperature. Press the fan switch to override this delay
and change the fan to a selected speed.
O(On/Off):Press this button to turn off the climate
control system. Outside air still enters the vehicle, and
is directed to the oor. This direction can be changed
by pressing the mode button. Recirculation can only
be selected in vent or bi-level mode. The temperature
can also be adjusted using either temperature button.If you adjust the air delivery mode or temperature
settings with the system off, the display comes on
briey to show the settings and then turns off. Press the
on/off button or the up down arrows on the fan switch,
the defrost button, AUTO button, or the air conditioning
button to turn the system on when it is off.
Manual Operation
The air delivery mode or fan speed can be manually
adjusted.
DC(Fan):The buttons with the fan symbols let you
manually adjust the fan speed. Press the up arrow
to increase fan speed and the down arrow to decrease
fan speed.
Pressing a fan button while the system is off will turn
the system on. Pressing a fan button while in automatic
control places the fan under manual control. The fan
setting remains displayed, the word AUTO is no longer
displayed, and the AUTO button indicator light turns
off. The air delivery mode remains in automatic control.
yNz(Mode):Press the mode up and down
buttons to manually change the direction of the airow
in the vehicle. Repeatedly press the button until the
desired mode appears on the display. Pressing a mode
button while the system is off will change air delivery
mode without turning the system on. Pressing one
of these buttons while in automatic control to place
the mode under manual control.
3-31

The air delivery mode setting remains displayed,
the word AUTO is no longer displayed, and the
AUTO button indicator light turns off.
H(Vent):This setting delivers air to the instrument
panel outlets.
)(Bi-Level):This mode directs air to the instrument
panel outlets and to the oor outlets. A little air is
directed towards the windshield and side window outlets.
Cooler air is directed to the upper outlets and warmer
air to the oor outlets.
6(Floor):This mode directs most of the air to
the oor outlets, with some of the air directed to the
windshield, side window outlets, and second row
oor outlets. In this mode, the system automatically
selects outside air. Recirculation cannot be selected
in oor mode.
-(Defog):See “Defogging and Defrosting” later
in this section.
@(Recirculation):Press this button to turn the
recirculation mode on. When the button is pressed,
an indicator light comes on.
This mode keeps outside air from entering the vehicle.
It can be used to reduce outside air and prevent
odors from entering your vehicle. Recirculation also
helps to quickly cool the warmer air inside your vehicle.
The recirculation mode cannot be used with oor, defrost,
or defogging modes. If you try to select recirculation in
one of those modes, the indicator ashes three times and
turns off. The air conditioning compressor also comes on
when this mode is activated. While in recirculation mode
the windows may fog when the weather is cold and damp.
To clear the fog, select either the defog or defrost mode
and increase the fan speed.
Press the button again to turn off the recirculation mode.
It automatically turns off when the engine is turned off and
must be re-selected when the engine is turned on again.
3-32

Air Conditioning
#
(Air Conditioning):Press this button to turn the
air conditioning (A/C) compressor on and off. When air
conditioning is selected, an indicator light comes on
to show that the air conditioning has been activated.
The air conditioning compressor does not work
when outside temperatures fall below 40°F (4°C).
Pressing this button when the outside temperature
is too cool makes the air conditioning indicator
ash three times and turn off to let you know the
air conditioning mode is not available. If the air
conditioning is on and the outside temperature
drops below a temperature which is too cool for
air conditioning to be effective, the air conditioning
light turns off to show that the air conditioning mode
has been canceled.
On hot days, open the windows long enough to let
hot inside air escape. This helps to reduce the time
it takes for the vehicle to cool down. It also helps
the system to operate more efficiently.
The air conditioning system removes moisture from the
air, so a small amount of water may drip underneath
your vehicle while idling or after turning off the engine.
This is normal.
Sensors
The solar sensor, located in the defrost grille in the
middle of the instrument panel, monitors the solar
radiation. Do not cover the solar sensor or the system
will not work properly.
3-33

The interior temperature sensor located on the
instrument panel to the right of the steering column,
measures the temperature of the air inside the vehicle.
There is also an exterior temperature sensor located
behind the front grille. This sensor reads the outside air
temperature and helps maintain the temperature inside
the vehicle. Any cover on the front of the vehicle could
cause a false reading in the displayed temperature.The climate control system uses the information from
these sensors to maintain your comfort setting by
adjusting the outlet temperature, fan speed, and the
air delivery mode. The system may also supply cooler
air to the side of the vehicle facing the sun. The
recirculation mode will also be used as needed to
maintain cool outlet temperatures.
Defogging and Defrosting
Fog on the inside of the windows is a result of high
humidity (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 mode up and down arrows to select the defog
mode. Use the defrost button to select the defrost mode.
-(Defog):The defog mode is used to clear the
windows of fog or moisture and warm the passengers.
This mode directs air to the windshield, oor outlets,
and side window vents. When this mode is selected,
the system turns off recirculation and runs the air
conditioning compressor unless the outside temperature
is close to freezing. The recirculation mode cannot be
selected while in the defog mode. Do not drive the
vehicle until all the windows are clear.
3-34

To clear fog from the rear seat side windows, select the
bi-level mode on the rear climate control system and
direct the headliner outlets toward the side windows.
0(Defrost):Press this button to remove fog or
frost from the windshield more quickly. This mode
directs most of the air to the windshield and side window
vents and some to the oor vents. In this mode, the
system automatically forces outside air into the vehicle.
The recirculation mode cannot be selected while in
the defrost mode. The air conditioning compressor
runs automatically in this setting, unless the outside
temperature is close to freezing. Do not drive the
vehicle until all the windows are clear.
While in defrost mode, if the PASS button is pressed,
the PASS button indicator will ash three times to
let you know that the passenger climate control system
cannot be activated. If the passenger temperature
buttons are adjusted while in defrost mode, the driver
temperature indicator will change. The passenger
temperature will not be displayed.
AUX (Auxiliary):Press this button to turn the
rear heating and air conditioning on. SeeRear Air
Conditioning and Heating System on page 3-36or
Rear Air Conditioning and Heating System and
Electronic Climate Controls on page 3-38.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
<(Rear Window Defogger):Press this button to
turn the rear window defogger on or off. The rear
window defogger stays on for about 10 minutes after
the button is pressed, before turning off. The defogger
can also be turned off by pressing the button again
or by turning off the engine. Do not drive the vehicle
until all the windows are clear.
If your vehicle has heated outside rearview mirrors,
the mirrors will heat to help clear fog or frost from the
surface of the mirror when the rear window defog
button is pressed.
Notice:Do not use a razor blade or sharp object
to clear the inside rear window. Do not adhere
anything to the defogger grid lines in the rear glass.
These actions may damage the rear defogger.
Repairs would not be covered by your warranty.
3-35

Outlet Adjustment
Use the slider switch in the center of the outlet,
to change the direction of the air ow. Use the
thumbwheel near the outlet to control the amount
of air ow or to shut off the airow completely.
Keep all outlets open whenever possible for best
system performance.
Operation Tips
Clear away any ice, snow, or leaves from the
air inlets at the base of the windshield that can
block the ow of air into the vehicle.
Use of non-GM approved hood deectors can
adversely affect the performance of the system.
Keep the path under all seats clear of objects
to help circulate the air inside the vehicle more
effectively.
If fogging reoccurs while in vent or bi-level modes
with mild temperature throughout the vehicle, turn
on the air conditioner to reduce windshield fogging.
Rear Air Conditioning and
Heating System
If your vehicle has this system, the rear controls are
three knobs located on the rear of the center console.
The system can be controlled from the front controls
as well as the rear controls.
To turn the system on, press the AUX button on the
front climate control system, an indicator will be
lit. Pressing the AUX button the rst time will turn the
rear system on in a mimic mode. In this mode, the
airow in the rear will be approximately the same
direction, temperature, and fan speed as the front.
Pressing the AUX button again will turn the rear system
and the indicator off.
If the rear controls are adjusted, the system turns
on in a rear independent mode. Airow in the rear
will then be directed according to the settings of the
rear controls. The rear system can be turned off
by pressing the AUX button on the front climate control
system and the indicator will turn off. The system
can be turned back on, by adjusting any of the rear
air conditioning control knobs.
3-36