Cadillac 2002 DeVille Owner's Manual page 212

Ventilation Tips
D
Keep the hood and front air inlet free of ice, snow or
any other obstruction (such as leaves). The heater
and defroster will work far better, reducing the
chance of fogging the inside of the windows.
D
Keep the air path under the front seats clear of
objects. This helps circulate air throughout
your vehicle.
Passenger Compartment Air Filter
Passenger compartment air, both outside air and
recirculated air, is routed through a passenger
compartment filter. The filter removes certain
contaminants from the air, including pollen and dust
particles. Reductions in airflow, which may occur more
quickly in dusty areas, indicate that the filter needs to
be replaced early.
The filter should be replaced as part of routine
scheduled maintenance. See "Passenger Compartment
Air Filter" in the Index for more information on
replacement. See "Maintenance Schedule" in the Index
for replacement intervals.
Your vehicle will not be damaged if you choose not to
replace the filter once the old one is removed.
3-10
HVAC Steering Wheel Controls
(If Equipped)
TEMP (Temperature): Press the up arrow on the
control to increase the temperature and the down arrow
to decrease temperature manually.
(Fan): Press the up arrow on the control to
increase the fan speed and the down arrow to decrease
fan speed manually.
Some heating and cooling
controls can be adjusted at
the steering wheel. Other
touch controls operate some
audio controls. See "Audio
Steering Wheel Controls" in
the Index.