Gmc 2002 Sierra User Manual Page 209

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3-6
AUTO: If the knob is in AUTO, the fan speed will vary
as the system maintains the selected temperature.
When both the fan control and mode knobs are in the
AUTO position, the system will then automatically
maintain the last selected temperature setting. Manual
control of functions is also available.
Temperature Knob
The middle knob on the control panel lets you select the
desired air temperature in your vehicle. This knob will
allow you to adjust the interior air temperature setting.
Move the knob clockwise toward 82 F (28 C) for
warmer air. Move the knob counterclockwise toward
66 F (19 C) for cooler air. When the system is set for
automatic operation, sensors will control the fan speed.
Full Hot: If you turn the temperature knob past 82 F
(28 C), the system will go into the “full hot” mode.
The system will remain at that maximum heating setting
and the fan will blow at the speed the fan knob is set to.
If the fan is in AUTO, it will run at full speed.
Full Cold: If you turn the temperature knob past 66 F
(19 C), the system will go into the “full cold” mode.
The system will remain at that maximum cooling setting
and the fan will blow at the speed the fan knob is set to.
If the fan is in AUTO, it will run at full speed.
Mode Knob -- Manual Operation
The right knob on the control panel allows you to
choose the direction of air delivery.
You can choose to set the climate control system
yourself, or let the system work for you by placing the
system in AUTO mode. See “Mode Knob -- Automatic
Operation” later in this section.
(Vent): This setting directs most of the air through
the instrument panel outlets and a small amount through
the floor outlets.
(Bi-Level): Air is delivered through the floor
outlets as well as the instrument panel outlets.
(Floor): This setting directs most of the air
through the floor outlets and some air through the
windshield defroster outlets.
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