Buick 1993 LeSabre Owner's Manual page 123

Auto
When the system is set for
automatic, air will come
from the floor outlets, the
instrument panel outlets, or
both.
Fan
speed will vary
(unless a blower
LO
or
HI
button has been pushed) as
the system gets to and
maintains the temperature
setting you have selected.
Dual Zone
____
The front seat passenger
can control air temperature
in their seating area.
The display will show the set temperature and blower
speed.
In cold weather the system will delay turning on the fan,
to avoid blowing cold air. The length
of
the delay
depends on engine coolant temperature, outside
temperature, and time since the engine was last started.
Pushing a LO or HI blower button will override this
delay, and cause the fan to start.
To rid the system of stale air in warm weather, air will
come out of the floor outlets for a short time.
The air temperature for the right side of the front seat
can be set using the control on the passenger's door.
Both
DUAL ZONE and AUTO buttons will light up. To
turn off this part of the system , push the DUAL ZONE
button again.
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