GMC Chevrolet Tahoe 2003 Manual page 192

When the weather is cool or damp, operating the system
in recirculation for extended periods of time may cause
fogging of the vehicle's windows. To clear the fog, select
either defog or front defrost.
You may also notice that the A/C compressor will run
while in recirculation mode. This is normal and helps to
prevent fogging.
9
(Off): Press this button to turn off the entire climate
control system. Outside air will still enter the vehicle, and
will be directed to the floor. This direction can be changed
by pressing the mode button. The temperature can also
be adjusted using either temperature knob. Press the up
or down arrows on the fan switch, the defrost button, the
AUTO button, or the air conditioning button to turn the
system on when it is off.
Display
If you press the MODE button to select an air delivery
mode, the display will change to show you the selected
air delivery mode. After ten seconds, the display will
change to show the driver temperature setting and the
selected mode.
If you press the up or down arrows on the fan switch,
the display will change to show the selected fan speed.
After ten seconds, the display will change to show
the driver temperature setting and the selected mode.
3-28
Whenever you press AUTO, the display will change to
show the following:
•
the current driver's set temperature and an arrow
for five seconds,
•
the current passenger's set temperature setting and
an arrow for five seconds and
•
the automatic air delivery mode and fan speed.
If the driver's and passenger's temperature settings are
the same when AUTO is pressed, the temperature
setting and both arrows will be displayed for five
seconds along with the automatic air delivery mode and
fan speed. After the five second update, the display
will change to show the temperature setting, both arrows
and AUTO.
Air Conditioning
#
(Air Conditioning): Press this button to turn the air
conditioning (A/C) compressor on and off. The snowflake
symbol will appear on the display when the A/C is on.
Pressing this button when the outside temperature is
below 35°F (2°C) will make the snowflake symbol flash
three times and then it will 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 35°F
(2°C), the snowflake symbol will turn off to let you know
the air conditioning mode has been canceled.