Chevrolet 2002 Astro Owner's Manual page 153

Temperature Knob
This knob is next to the fan knob. It controls the
temperature of the air flowing into your vehicle. Turn
the knob clockwise for warmer air. Turn the knob
counterclockwise for cooler air.
Function Knob
This knob is located on the right side of the temperature
knob. The function knob allows you to choose the
direction of air delivery.
OFF: This setting turns the system off.
MAX A/C (Maximum Air Conditioning): This setting
cools the air the fastest, by recirculating the inside air.
A/C (Air Conditioning): This setting brings in outside
air, cools and dehumidifies it.
-
(Bi Level): This setting brings in outside air and
blows it out through the floor ducts and the instrument
panel vents. If you move the temperature knob between
hot and cold, cooler air will come out of the upper vents
while warmer air comes out of the floor ducts. The air
conditioning compressor may operate in this setting to
cool the air.
3-4
(Vent): The air comes out at the vents on your
instrument panel. The air conditioning compressor will
not run in this position. Adjust the temperature knob for
warmer or cooler air.
(Floor): Most of the air comes out near the floor.
The rest comes out from the defroster vents under the
windshield and at the front side windows.
(Blend): With this setting, the outside air comes
out of both the floor ducts and defroster vents. Adjust
the temperature knob for warmer or cooler air. The air
conditioning compressor may operate in this setting to
dehumidify the air.
DEF (Defrost): This setting operates the defroster.
Most of the air comes out near the windshield, with
some going to the floor ducts and front side windows.
The air conditioning compressor may operate in this
setting to dehumidify the air.