Cadillac 1996 Eldorado Owner's Manual page 151

DEFOG:
Press this 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.
8
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
warm, 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 arrow 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.
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.