Buick LaCrosse Owner's Manual page 268

8-6 Climate Controls
A. Power
B. Driver Temperature Control
C. Defrost
D. Fan Control
E. Air Delivery Mode Control
F. Recirculation/Automatic
Recirculation
eAssist Vehicles
G. Passenger Temperature Control
H. AUTO (Automatic Operation)
I. Rear Window Defogger
J. Eco Air Conditioning
K. Comfort Air Conditioning
L. ZONE
Climate Control Influence on
eAssist Operation and Fuel
Economy (If Equipped)
The climate control system is
dependent upon other vehicle
systems for heat and power input.
Certain climate control settings can
lead to higher fuel usage and/or
fewer auto stops.
The following are climate control
settings that use more fuel:
Comfort air conditioning mode.
The Defrost mode.
Extreme temperature settings,
such as 15°C (60°F) or
32°C (90°F).
High fan speed settings.
To help reduce fuel usage:
Use the full automatic control as
described under Automatic
Operation .
Use eco air conditioning, instead
of the comfort air conditioning.