Buick 1993 LeSabre Owner's Manual page 120

Your Buick Comfort Control System
This part tells you how to make your air system work
for you.
Fresh air from outside your vehicle flows through your
Buick when the car is moving. When the vehicle is not
moving, you can get outside air to flow through by
selecting any air choice (except the rear window
defogger) and the HI fan speed.
Air Outlets
1
Adjust the direction of air
flow by moving the
I
louvered vents.