Buick 1994 LeSabre Owner's Manual page 129

If your Buick has this climate control system, the
following information tells you how it works.
Fan Speeds
The fan control is used to select the speed of the blower
fan. There are four speeds to choose from. Moving the
lever to the right or left will increase or decrease the fan
speed. The fan will be off when the system is off.
Temperature
The lower lever changes the temperature of the air
coming through your air outlets. Moving the lever
between COOL and WARM will raise or lower the
temperature.
Off
When the system is off, the ventilation system will allow
air to flow through your Buick when the vehicle is
moving. The system will try to keep the air at the chosen
temperature, unless it is very hot or very cold outside.
When the system
is off,
the blower fan is also off.
Air Conditioning
The next three selections cool the air. The air
conditioner won't work well unless all the windows are
closed. On very hot days, open the windows long
enough to let hot inside air out. This reduces the amount
of work your air conditioner's compressor
will have
to
do, which should help fuel economy.
The air conditioning compressor operates in all Air
Conditioning positions and the DEFOG and Defrost
position when the outside temperature is above 47°F
(SOC). Selecting OFF, VENT or HTR turns OFF the air
conditioning compressor.
When you don't need to cool the outside air, use the
VENT or HEAT settings. Adjust the temperature control
for comfort. You'll get better fuel economy (gas
mileage) if you're not cooling the outside air. When you
cool the air, your engine runs a refrigeration compressor,
and
it
has to work a little harder.
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