2018 BUICK LACROSSE air conditioning

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
Introduction 3
{Danger
Danger indicates a hazard with a
high level of risk which will result
in serious injury or death.
{Warning
Warning indicates a hazard that
could result in injury or death.
Caution
Caution indicates a hazard that
could result in property or vehicle
damage.
A circle with a slash through it is a
safety symbol which means“Do
Not,” “Do not do this,” or“Do not let
this happen.”
Symbols
The vehicle has components and
labels that use symbols instead of
text. Symbols are shown along with
the text describing the operation or
information relating to a specific
component, control, message,
gauge, or indicator.
M: Shown when the owner ’s
manual has additional instructions
or information.
*: Shown when the service
manual has additional instructions
or information.
0: Shown when there is more
information on another page —
“see page.”
Vehicle Symbol Chart
Here are some additional symbols
that may be found on the vehicle
and what they mean. See the
features in this manual for
information.
9: Airbag Readiness Light
#:Air Conditioning
!:Antilock Brake System (ABS)
$:Brake System Warning Light
":Charging System (12-Volt
Battery)
I: Cruise Control
`:Do Not Puncture
^:Do Not Service
B:Engine Coolant Temperature
O:Exterior Lamps
g: First Responder
_:Flame/Fire Prohibited
.:Fuel Gauge
+: Fuses
3:Headlamp High/Low-Beam
Changer
_: High Voltage
j: LATCH System Child Restraints
*:Malfunction Indicator Lamp
::Oil Pressure
O:Power

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
In Brief 17
Climate Controls
Dual Automatic Climate control System
The climate control buttons on the center stack and on the climate control
display are used to adjust the heating, cooling, and ventilation.
Center Stack Climate Controls
1. Driver and Passenger Temperature Displays
2. Driver and Passenger Temperature Controls
3. Driver and Passenger Heated and Ventilated Seats (If
Equipped)
4. Fan Controls
5. CLIMATE 6. MAX Defrost
7. Recirculation
8. Rear Window Defogger and
Heated Outside Mirrors (If
Equipped)
9. Power (ON/OFF)
10. AUTO (Automatic Operation)
Climate Control Display
1. Outside Temperature Display
2. Driver and Passenger Temperature Controls
3. Fan Control
4. Sync (Synchronized Temperature)
5. A/C (Air Conditioning)
6. Climate Control Selection (Application Tray Button)
7. Air Delivery Mode Control
See Dual Automatic Climate Control
System 0152.

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
In Brief 23
eAssist Features
eAssist Overview
Vehicles with the 2.5L engine have
eAssist, with additional features that
contribute to increased efficiency.
Vehicles with eAssist have an
automatic engine Stop/Start feature.
This feature saves fuel by shutting
the engine off when the vehicle is
stopped. When the engine shuts off
automatically, all the accessories
will continue to operate normally. In
very hot or cold conditions, the
engine may not shut off. See
Starting the Engine0172.
There are two air conditioning
settings available. The MAX setting
maximizes cabin comfort. The ECO
setting maximizes efficiency
allowing more frequent, and longer
engine stops than the MAX setting.
See Dual Automatic Climate Control
System 0152.
Vehicles with eAssist include an
AUTO STOP indicator on the
tachometer. See Instrument Cluster
0 110. The eAssist system uses a high
voltage battery, which is cooled with
air drawn from the vehicle interior.
The cold air intake for the battery is
under the leading edge of the rear
seat. The exhaust for warm air is in
the trunk. Do not cover the intake or
exhaust. See
Battery - North
America 0247.
High Voltage Safety
Information
Vehicles with eAssist have a
standard 12-volt battery and a high
voltage battery. Only a trained
service technician with the proper
knowledge and tools should inspect,
test, or replace the high voltage
battery. See your dealer if the high
voltage battery needs service.
In emergency situations, first
responders can cut the two clearly
labeled cut points in the engine
compartment to disable the high
voltage battery and air bag systems.
Do not cut the high voltage cable.
Automatic Engine Stop/
Start Feature
Vehicles with eAssist have an
automatic engine Stop/Start feature.
After the engine is started and has
reached operating temperature, this
feature may cause Auto Stop which
will turn the engine off when the
brake pedal is applied and the
vehicle comes to a complete stop.
When the brake pedal is released,
or the accelerator pedal is applied,
the engine will restart. The engine
will continue to run until the next
Auto Stop.
AUTO STOP on the tachometer
signifies that the engine is in Auto
Stop mode. See Tachometer0112.
Remember to put the transmission
in P (Park) and turn the ignition off
before exiting the vehicle.
See Starting the Engine 0172.

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
Climate Controls 153
10. AUTO (Automatic Operation)
Climate Control Display
1. Outside Temperature Display
2. Driver and Passenger Temperature Controls
3. Fan Control
4. Sync (Synchronized Temperature)
5. A/C (Air Conditioning)
6. Climate Control Selection (Application Tray Control)
7. Air Delivery Mode Control The fan, air delivery mode, air
conditioning, driver and passenger
temperatures, and Sync settings
can be controlled by touching
CLIMATE on the infotainment Home
Page or the climate button in the
climate display application tray.
A selection can then be made on
the front climate control page
displayed. See the infotainment
manual.
Climate Control Status Display
The climate control status display
appears briefly when the center
stack climate controls are adjusted. The air delivery mode can be
adjusted on the climate control
display.
Climate Control Influence on
eAssist Operation and Fuel
Economy (If Equipped)
The climate control system depends
on 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 climate control
settings use more fuel:
.
MAX air conditioning mode
. 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.”
. Select a temperature setting that
is higher in hot weather and
lower in cold weather.

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
154 Climate Controls
.Turn off the air conditioning
when it is not needed.
. Only use defrost to clear the
windows.
Automatic Operation
The system automatically controls
the fan speed, air delivery, air
conditioning, and recirculation in
order to heat or cool the vehicle to
the desired temperature.
When AUTO is lit, all four functions
operate automatically. Each function
can also be manually set and the
selected setting is displayed.
Functions not manually set will
continue to be automatically
controlled, even if the AUTO
indicator is not lit.
For automatic operation:
1. Press AUTO.
2. Set the temperature. Allow the system time to stabilize. Adjust
the temperature as needed for
best comfort.
To improve fuel efficiency and to
cool the vehicle faster with A/C on,
recirculation may be automatically selected in warm weather. Press
@to select recirculation; press it
again to select outside air.
Driver and Passenger
Temperature Controls : The
temperature can be adjusted
separately for the driver and the
passenger. Turn the knob clockwise
or counterclockwise to increase or
decrease the driver or passenger
temperature setting.
The driver and passenger
temperatures can also be adjusted
by touching the controls on the
climate control display.
Sync : Touch Sync on the climate
control display to link all passenger
settings to the driver settings. Adjust
the driver side temperature control
to change the linked temperature.
When the passenger settings are
adjusted, Sync is displayed when
the temperatures are unlinked.
Manual Operation
CLIMATE : Press CLIMATE to show
the climate control display.
ON/OFF : Press to turn the fan on
or off.
hi: Touch or press the fan controls
on the climate control display or
center stack to increase or decrease
the fan speed. The fan speed
setting displays. When the fan
speed is decreased completely, the
climate control system turns off.
It will turn back on if the fan speed
is increased.
Pressing either control cancels
automatic fan control and the fan is
controlled manually. Press AUTO to
return to automatic operation.
Air Delivery Mode Control : When
the climate information is displayed,
touch
6,Y, orXon the climate
control display to change the
direction of air flow. Any
combination of the three controls
can be selected. The selected air
delivery mode is lit. Pressing any
control cancels automatic air
delivery control and the direction of
the airflow is controlled manually.
Press AUTO to return to automatic
operation.

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
Climate Controls 155
To change the current mode, select
one or more of the following:
6:Air is directed to the floor
outlets, with some air to the
windshield and side windows.
Y: Air is directed to the instrument
panel outlets.
X: Clears the windows of fog or
moisture. Air is directed to the
windshield.
1MAX : Air is directed to the
windshield, the fan runs at a higher
speed, and the temperature of the
air is increased if not already at
maximum. This mode overrides the
previous mode selected and clears
fog or frost from the windshield
more quickly. When the control is
pressed again, the system returns
to the previous mode setting and
fan speed.
For best results, clear all snow and
ice from the windshield before
defrosting.
For eAssist vehicles that have the
auto defog feature, Auto Stops can
occur in defrost mode. In this mode, the Auto Stops are shorter and less
frequent than other air delivery
modes to prevent window fogging.
A/C (Air Conditioning) :
Touch A/C
on the climate control display to
cycle between the MAX, ECO, and
OFF modes. The MAX, ECO or OFF
indicator will appear on the display.
If the fan is turned off, the air
conditioner will not run and the
indicator light will turn off.
Touch AUTO to return to automatic
operation and the air conditioner
runs automatically as needed. The
A/C will return to ECO a/c operation.
For MAX a/c, touch A/C. Auto Stops
will occur less frequently, be shorter,
and will not occur in extremely warm
weather.
For ECO a/c, touch A/C again. This
setting balances fuel economy and
air conditioning comfort. In warm
weather conditions, Auto Stops may
occur more frequently, last longer,
and the vehicle interior may be
warmer during Auto Stops as
compared to the MAX A/C setting.
This setting allows higher humidity inside the vehicle and window
fogging may occur before the
engine restarts.
@:
Press to turn on recirculation.
An indicator light comes on. Air is
recirculated to quickly cool the
inside of the vehicle or to reduce the
entry of outside air and odors.
If selected during cool or cold
weather, the windshield and
windows may fog. Turn off
recirculation to help clear the
windshield and windows.
If equipped, the Air Quality Sensor
may operate the recirculation mode
automatically. See “Climate and Air
Quality” underVehicle
Personalization 0133.
Auto Defog : If equipped, the
climate control system may have a
sensor to automatically detect high
humidity inside the vehicle. When
high humidity is detected, the
climate control system may adjust to
outside air supply and turn on the
air conditioner. The fan speed may
slightly increase to help prevent
fogging. If the climate control
system does not detect possible

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
158 Climate Controls
Maintenance
Air Intake
Clear away any ice, snow, or leaves
from the air intake at the base of the
windshield that can block the flow of
air into the vehicle.
Passenger Compartment
Air Filter
The filter removes dust, pollen, and
other airborne irritants from outside
air that is pulled into the vehicle.
The filter should be replaced as part
of routine scheduled maintenance.
SeeMaintenance Schedule 0311
for replacement intervals. For more
information, see your dealer.
Service
All vehicles have a label underhood
that identifies the refrigerant used in
the vehicle. The refrigerant system
should only be serviced by trained
and certified technicians. The air
conditioning evaporator should
never be repaired or replaced by one from a salvage vehicle.
It should only be replaced by a new
evaporator to ensure proper and
safe operation.
During service, all refrigerants
should be reclaimed with proper
equipment. Venting refrigerants
directly to the atmosphere is harmful
to the environment and may also
create unsafe conditions based on
inhalation, combustion, frostbite,
or other health-based concerns.

Buick LaCrosse Owner Manual (GMNA-Localizing-U.S./Canada-10999169) -
2018 - crc - 3/28/17
Driving and Operating 173
starting it. Operate the engine
and transmission gently until
the oil warms up and lubricates
all moving parts.
Stop/Start System
{Warning
Exiting the vehicle without first
shifting into P (Park) may cause
the vehicle to move. You or others
may be injured. Because the
vehicle may have an auto engine
stop/start feature, the vehicle's
engine might seem to be shut off;
however, once the brake pedal is
released, the engine will start up
again.
Shift to P (Park) and turn the
ignition off before exiting the
vehicle.
The vehicle may be equipped with a
fuel saving Stop/Start system to
shut off the engine to help
conserve fuel.
Auto Stop (Vehicles without
eAssist)
If equipped, when the brakes are
applied and the vehicle is at a
complete stop, the engine may turn
off. When stopped, the tachometer
displays AUTO STOP. See
Tachometer 0112. When the brake
pedal is released or the accelerator
pedal is pushed, the engine will
restart.
The vehicle may remain in Auto
Stop even after it is shifted into
P (Park). Auto Stop will be
maintained until the door is opened
or the seat belt is unbuckled. There are several conditions that
may prevent an Auto Stop or cause
an Auto Start.
Auto Stop may be deactivated if:
.
A minimum vehicle speed is not
reached.
. The engine or transmission is
not at the required operating
temperature.
. The outside temperature is not
in the required operating range,
typically below −10 °C (14 °F) or
above 50 °C (122 °F).
. The transmission is in any gear
other than D (Drive).
. The battery charge is low.
. The battery has been
disconnected.
. The system may not be able to
shut off the engine in order to
maintain the air conditioning
comfort level or defrost system
settings. See Dual Automatic
Climate Control System 0152.
To maximize fuel economy, use
the ECO air conditioning mode.