Buick 1994 Roadmaster Owner's Manual page 134

I
Defrost will work better if any ice and snow is cleared
from the hood and the air inlet area between the hood
and the windshield.
Blower speed will be controlled automatically, or you
can choose another speed by pushing Ir, FAN
v.
Defog
This setting directs the air flow to the windshield and
floor areas.
Middle
Pushing the middle button directs the air through the
instrument panel outlets.
Blend
The BLEND setting directs the air flow to the
instrument panel outlets and the floor outlets;
Floor
Pushing the FLOOR setting directs all air flow to the
floor outlets.
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