Page 145 of 436

)(Bi-Level):This mode directs approximately half of
the air to the instrument panel outlets, then directs
the remaining air to the ¯oor outlets. A little air is
directed toward the windshield and the 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. Some air also comes out of the defroster
and side window outlets. The recirculation button cannot
be selected in ¯oor mode.
h(Recirculation):Press this button to turn
recirculation mode on or off. When this button is
pressed, an indicator light in the button will also come
on to let you know that it is activated. Recirculation
mode is used to recirculate the air inside of your vehicle.
Use this mode to help prevent outside odors and/or
dust from entering your vehicle or to help cool the air
inside of your vehicle more quickly. Recirculation
mode can be used with vent and bi-level modes, but it
cannot be used with ¯oor, defog or defrost modes.
If the weather is cold and damp, the system may
cause the windows to fog while using recirculation
mode. If the windows do start to fog, select defog or
defrost mode.
#A/C (Air Conditioning):Press this button to
manually turn the air conditioning system on or off.
When the system is on, the system will automatically
begin to cool and dehumidify the air inside of your
vehicle.
If you select air conditioning off while in front defrost or
defog mode, the air conditioning off symbol will ¯ash
to let you know this option is not allowed.
You may notice a slight change in engine performance
when the air-conditioning compressor shuts off and
turns on again. This is normal.
A/C OFF (Air Conditioning Off):When you turn the
air conditioning off, the words A/C OFF will appear
on the display. When the air conditioning is selected or
in AUTO mode, the system will run the air conditioning
automatically.
3-27
Page 146 of 436

Defogging and Defrosting
Fog on the inside of 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. You can use either defog or front defrost
to clear fog or frost from your windshield.
-(Defog):Use this setting to clear the windows of fog
or moisture. This setting will deliver air to the ¯oor
and windshield outlets.
0(Front Defrost):Press the front defrost button to
clear the windshield and side windows of frost or
fog quickly. The system will automatically control the fan
speed if you select defrost from AUTO mode. If the
outside temperature is 40ÉF (4ÉC) or warmer, your air
conditioning compressor will automatically run to
help dehumidify the air and dry the windshield. Do not
drive the vehicle until all the windows are clear.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog from the rear window.
<(Rear):Press this button to turn the rear window
defogger on or off.
An indicator light in the button will come on to let you
know that the rear window defogger is activated.
The rear window defogger will turn off approximately
10 minutes after the button is pressed. If you need
additional warming time, press the button again.
Notice:Using a razor blade or sharp object to clear
the inside rear window may damage the rear
window defogger. Repairs would not be covered by
your warranty. Do not clear the inside of the rear
window with sharp objects.
3-28
Page 147 of 436

Outlet Adjustment
Use the air outlets located in the center and on the side
of your instrument panel to direct the air¯ow.
Ventilation System
For mild outside temperatures when little heating or
cooling is needed, use the vent setting to direct outside
air through your vehicle.
Your vehicle's ventilation system supplies outside air to
the inside of your vehicle when it is moving. With the
side windows closed, air will ¯ow into the front air inlet
grilles, through the vehicle and out the air exhaust
valves.
Outside air will also enter the vehicle when the heater
or the air conditioning compressor is running, unless you
have pressed the recirculation button.
Operation Tips
·
Keep the hood and front air inlets free of ice, snow,
or any other obstruction (such as leaves). The
heater and defroster will work far better, reducing
the chance of fogging the inside of your windows.
·When you enter a vehicle in cold weather, turn the
fan knob all the way to the right for a few moments
before driving. This helps clear the intake ducts
of snow and moisture, and reduces the chance of
fogging the inside of your window.
·Keep the air path under the front seats clear of
objects. This helps air to circulate throughout
your vehicle.
·Adding outside equipment to the front of your
vehicle, such as hood-air de¯ectors, may affect the
performance of the heating and air conditioning
system. Check with your dealer before adding
equipment to the outside of your vehicle.
3-29
Page 148 of 436

Rear Climate Control System
Your TrailBlazer has one of the following rear climate
control systems. With either system, the rear climate
controls will be disabled when the front climate control
system is in defrost. This occurs to provide maximum
air¯ow to clear the windshield.
The temperature of the air coming through the rear
outlets is determined by the front passenger's
temperature setting. Press the PWR button to turn the
rear climate controls on and off. Use the mode knob
to change the direction of air¯ow (upper, bi-level or ¯oor)
to the rear seat area.If your vehicle has the rear seat audio system, the lower
buttons are used to adjust the rear seat climate
controls. The temperature of the air coming through the
rear outlets is determined by the front passenger's
temperature setting.
The button with the up and down arrows on it regulates
the fan speed. The mode button can be used to
change the direction of air¯ow (upper, bi-level or ¯oor)
to the rear seat area. To turn the rear climate controls
off, press the lower PWR button.
3-30
Page 149 of 436
The left button with the up and down arrows on it
regulates the fan speed. The mode button can be used
to change the direction of air¯ow (upper, bi-level or
¯oor) to the rear seat area. To turn the rear climate
controls off, press the lower power button.
Outlet Adjustment
Your vehicle may have rear seat outlets that can be
used to adjust the air¯ow toward either seating area, the
¯oor or upward. Move the control in the center of
each outlet in any direction to direct air¯ow.
3-31
Page 150 of 436

TrailBlazer EXT
To operate the rear air conditioning system, the front air
conditioning system must be on. With the front air
conditioning system off, the rear system controls can
only be used to circulate air in the rear of the vehicle.
To adjust the air¯ow
speed, turn the fan knob
(driver override switch),
located on the ¯oor
console to 1, 2 or 3.
The rear mode and
temperature position
will now mimic the front
control system mode
and passenger side
temperature.
H(Panel):When panel mode is selected in the front
controller, the rear system will distribute air from the
four headliner outlets.
)(Bi-level):When bi-level mode is selected in the
front controller, the rear system will distribute air
from the four headliner outlets and the third seat
¯oor outlet.
6(Floor):When ¯oor mode is selected in the front
controller, the rear system will distribute air from the
third seat ¯oor outlet.
-(Defog):When defog mode is selected in the front
controller, the rear system will distribute air from the
third seat ¯oor outlet.
0(Defrost):When defrost mode is selected in the
front controller, the rear system will distribute air
from the third seat ¯oor outlet.
To activate the second row seat controls in the following
systems, set the fan knob, located on the front
console, to R.
3-32
Page 151 of 436
Turn the knobs on the control panel to choose a fan
speed, temperature and direction of air¯ow.
Select panel mode to deliver air to the four headliner
outlets. Select bi-level mode to deliver warmer air to the
third seat ¯oor outlet and cooler air to the headliner
outlets. Select ¯oor mode to deliver air to the ¯oor outlet
located in the third seat area.Press the buttons at the bottom of the audio control
panel to adjust the fan speed, mode and temperature for
the rear passengers. The selections will be shown on
the display.
Press the rear fan control button with the arrow pointing
right to turn the rear climate control on. Toggle this
button to adjust the air ¯ow speed. To turn the
rear system off, toggle the left arrow until the display
turns off. TrailBlazer EXT
TrailBlazer EXT
3-33
Page 152 of 436

Steering Wheel Climate Controls
You can adjust the fan
speed and temperature of
the front climate control
system by using the
buttons located on your
steering wheel.
9(Fan):Press the up or down arrow on this switch to
increase or decrease the fan speed.
B(Temperature):Press the up or down arrow on this
switch to increase or decrease the temperature of
the air ¯owing through the system.
Climate Controls Personalization
If your vehicle is equipped with the Driver Information
Center (DIC), you can store and recall the climate
control settings for temperature, air delivery mode and
fan speed for two different drivers. The personal
choice settings recalled are determined by the
transmitter used to enter the vehicle. After the button
with the unlock symbol on a remote keyless entry
transmitter is pressed, the climate control will adjust to
the last settings of the identi®ed driver. The settings
can also be changed by pressing one of the memory
buttons (1 or 2) located on the driver's door. When
adjustments are made, the new settings are
automatically saved for the driver.
3-34