Chevrolet 1994 Astro Passenger Owner's Manual page 131

Air Vents
I
You will find air vents
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 corning
out of any vents that
are open.
If your vehicle doesn't have air conditioning, there is an air vent in the
right-hand kick panel below the instrument panel. The vent has a handle to
open and close it.
3-3