GMC sonoma 2001 Manuale Utente

With these systems, you can control the heating, cooling
and ventilation in your vehicle.

The knob on the left side of the heating system 
control panel controls the fan speed. To increase 
airflow, turn the knob clockwise. To decrease airflow,
turn it counterclockwise.

The middle knob on the control panel lets you select the
relative temperature of the air flowing into the passenger
area of your vehicle. Turn the knob clockwise toward the
red area for warmer air. Turn the knob counterclockwise
toward the blue area for cooler air.

The right knob on the control panel allows you to
choose the direction of air delivery.

OFF: This setting turns the system off. Some outside 
air will still enter the vehicle whenever the vehicle is
moving forward. If the air entering your vehicle is
warmer than desired, turn the temperature knob fully
counterclockwise and turn the mode knob to VENT.

VENT: This setting directs most of the air through

the instrument panel outlets and a small amount through
the floor outlets.

LEVEL: Air is delivered through the heater

floor outlets as well as the instrument panel outlets.

HEATER: This setting directs most of the

warmed air through the heater floor outlets and some air
through the windshield defroster outlets.