Buick 1993 Roadmaster Owner's Manual page 135

i
the sun may adequately warm your upper body, but your
lower body may not be warm enough.
The Bi-level settbg directs outside air.into your vehicle
in two ways.-Cool air is directed 'toward your upper
body through the front instrument panel outlets, ,while
slightly warmed air is directed through the heater outlet
at your feet.
.The air conditioner compressor operates in all Air
Conditioning positions, and the Defrost position when
.the outside temperature is above 40
O F
(4.5 C).
R
Ventilation
For mild outside temperatures, when little heating
ox
,
cooling is needed, slide the upper lever to Vent, Air will,'
flow through the .instrument panel outlets. Use the air
oudets to turn on, adjust and turn off the air, flow. Adjust.
the lower lever to control the temperature;
' .
.. .
Heating
When outside temperatures are cold, 8liding:the upper
.
lever to Heater and the' lower lever to :Warm will send,
heated air though the heater outlets, 'and-some through
the defroster vents. Vent and Heater arelabeled
economy positions. because the
d r
conditioner
compres.sor doesn't run in these..two settings. "This
. .
reduces engine load, resulting in impioyed
I . .
f y d .
economy.
Defrosting
The Defrost setting directs most of the- air through the
defroster vents, and some through.the heater outlets. Use
defrost when you want to remove fog ,6r ice from the
windshield.
133