Pontiac 2003 Vibe - Manual (Page 146)

3-6
Ventilation System
For mild outside temperatures, when very little heating
is required, you can still direct outside air through
your vehicle.
Use outside air and turn the mode knob to vent. Turn
the temperature knob to a comfortable setting and the
fan knob toward HI.
Constant airflow through the side vents is normal in all
airflow modes. To optimize the effectiveness of your
system in the floor, defog, or defrost modes, close the
outboard vents.
Your vehicle’s flow - through ventilation system supplies
outside air into the vehicle when it is moving. Outside
air will also enter the vehicle when the heater or the air
conditioning compressor is running and the comfort
control system is circulating outside air.
Your vehicle has air outlets
that allow you to adjust the
direction of airflow.
You can direct the airflow side - to - side by turning the
vents. Airflow comes out of the vents on defrost, defog
and floor positions at a reduced flow.