Chevrolet 2007 Silverado 1500 Pickup Owner's Manual page 237

If you select recirculation while in defrost, defog,
or floor, the light in the button will flash and then go
out to let you know that this is not allowed. This
is normal and helps to prevent fogging.
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 air condition
compressor will run while in recirculation mode.
This is normal and helps to prevent fogging.
(Off): Press this button to turn off the entire
9
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.
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
•
The automatic air delivery mode and
fan speed
237