Heatedait. Conditioning Controls - GMC 1994 Sonoma Owner's Manual

OFF:
This setting turns off all heating functions. Some outside air will still
come out of the heater outlet whenever the vehicle is moving forward.
VENT: Airflow is through the instrument panel vents. Set the upper knob to
the temperature desired. This setting is useful for mild outside temperatures,
when little heating or cooling is desired.
BI-LEV: Outside air comes in through the heater floor vents and the
instrument panel vents. This setting is useful in cool weather with bright
sunlight.
HEAT Heated air comes out through the heater floor vents and windshield
defroster vents. This setting is useful for cold weather.
BLEND: Airflow is divided equally between the heater floor vent and the
windshield defroster vents. This setting is useful in cool weather when you
have fog or ice on the windshield or side windows.
DEF: This setting directs most air through the windshield defroster vents
and some through the heater vents. This setting is useful when you have fog
or ice on the windshield.
Heater/Air Conditioning Controls
If your vehicle has air
conditioning, your
heaterhir conditioning
controls will look like
this.
Before using your vehicle's air conditioning, open the windows to clear the
vehicle of hot air.
The switch on the righthand side changes the fan speed. To increase the fan
speed, push the switch upward toward HI. To decrease the fan speed, push
the switch downward toward LO .
The upper knob changes the air temperature. Turn the knob right (clockwise)
for warmer air. Turn the knob left (counterclockwise) for cooler air.
The lower knob changes the heater function and determines which outlets
the air will flow through (instrument panel, defroster, heater, etc.).