Ventilation System - Chevrolet 2000 C-Series Owner's Manual

Defogging
Use DEFOG, along with the HEATER setting, when
there is fog or ice on the windshield. This will direct
airflow toward the windshield and front side windows.
Set the temperature selector toward H and the fan control
at a comfortable level. When the windshield is clear, use
the temperature selector bar and the fan control button
to maintain a comfortable temperature level.

Ventilation System

Air comes into your vehicle in one of two ways: power
air or ram air. Power air means bringing outside air into
the cab through the air intake, using the blower fan.
Fresh air can be drawn in when the vehicle is stationary
or moving at low speed. Air comes in through four
vents in the instrument panel and is exhausted through
the vents and pressure relief valves in the doors and door
pillars. Power ventilation means an increased supply of
fresh air is brought into the cab interior without having to
open the windows, especially during inclement weather.
Ram air is forced into the cab through the air intake
in the cowl by the vehicle's forward motion. This air is
controlled by two vent air handles under the instrument
panel. Air is directed through the ventilation ducts to
the floor. Ram air provides good airflow into the cab at
normal road speeds.
3-6
Ventilation Tips
D
Keep the hood and front air inlet free of ice, snow or
any other obstruction (such as leaves). The heater
and defogger will work far better, reducing the
chance of fogging the inside of your windows.
D
When you enter a vehicle in cold weather, turn the
blower fan to high for a few moments before driving
off. This helps clear the intake ducts of snow and
moisture and reduces the chance of fogging the
inside of your windows.
D
Keep the air path under the seats clear of objects.
This helps air to circulate throughout your vehicle.
The air vents are located in the center and on the sides of
your instrument panel. You can move the vents to direct
the flow of air or close the vents altogether. When you
close a vent, it will increase the flow of air coming out
of any vents that are open.
If your vehicle does not have air conditioning, there are
air vent controls located below the instrument panel.