Chevrolet Silverado Classic 2007 Owner's Manual page 234

2. Set the driver's and passenger's temperature.
To find your comfort setting, start with a
74°F (23°C) temperature setting and allow
about 20 minutes for the system to regulate.
Turn the driver's or passenger's side
temperature knob to adjust the temperature
setting as necessary. If you choose the
temperature setting of 60°F (15°C) the system
will remain at the maximum cooling setting.
If you choose the temperature setting
of 90°F (32°C) the system will remain at
the maximum heat setting. Choosing either
maximum setting will not cause the vehicle
to heat or cool any faster.
Be careful not to cover the solar sensor
located on the top of the instrument panel
near the windshield. This sensor regulates
air temperature based on sun intensity.
It also turns on the headlamps. For more
information on the solar sensor, see
"Sensors" later in this section.
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To avoid blowing cold air in cold weather,
the system will delay turning on the fan until
warm air is available. The length of delay
depends on the engine coolant temperature.
Pressing the fan switch will override this delay
and change the fan to a selected speed.
(Off): Press this button to turn off the entire
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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.