Cadillac 1996 DeVille Owner's Manual page 151

DEFOG: Press thl's button to divide the air between the
windshield and the heater outlets. This is useful when
fog appears on the windshield or side glass due to
sudden rain or snowy conditions. This feature is not
available with the heated windshield option.
AUTO/ECON:
Press this button
to
switch between
AUTO and ECON. The ECON setting attempts to keep
air at a selected temperature, however, it does not
remove humidity from the air. Use this setting in cold or
cool weather to save fuel. The AUTO setting is used
when it's warm outside and you need to cool the air in
order to maintain a selected temperature and blower
speed.
FAN SPEEDS: Press the button with the
fan
symbol until AUTO is displayed on the screen. At this
setting, the fan speed is automatically controlled. If it is
cold outside, the blower may not run in the maximum
high fan speed right away. The system checks the
temperature of the engine coolant to assure it is warm
enough to provide heat. When
the engine coolant is
w m , the controller allows the fan to gradually increase
to a higher speed. This prevents cold air from blowing
into the passenger compartment. If you want the blower
fan at a high speed, press the up arrow button until you
see HI
on
the display. If you want the fan speed to be
automatic, but you like the fan speed to be higher than
the AUTO setting, press the fan symbol button until HI
AUTO is shown on the display. If you want the blower
fan at a low speed, press the down mow button until
LO is shown on the display. If you want the fan speed to
run lower than the AUTO setting, press the button until
AUTO LO is shown on the display.
9
DEFROST: Press this button to quickly remove
fog or frost from the windshield. This setting sends most
of the airflow to the windshield with only a small
amount to the floor outlets.