2012 BUICK LACROSSE air conditioning

Black plate (20,1)Buick LaCrosse Owner Manual - 2012
10-20 Vehicle Care
If Steam Is Coming from the
Engine Compartment
SeeOverheated Engine Protection
Operating Mode on page 10‑21 for
information on driving to a safe
place in an emergency.
If No Steam Is Coming from
the Engine Compartment
If an engine overheat warning is
displayed but no steam can be seen
or heard, the problem might not be
too serious. Sometimes the engine
can get a little too hot when the
vehicle:
.Climbs a long hill on a hot day.
.Stops after high-speed driving.
.Idles for long periods in traffic.
.Tows a trailer. If the overheat warning displays with
no sign of steam:
1. Turn the air conditioning off.
2. Turn the heater on to the highest
temperature and to the highest
fan speed. Open the windows as
necessary.
3. In heavy traffic, let the engine idle in N (Neutral) while stopped.
If it is safe to do so, pull off the
road, shift to P (Park) or
N (Neutral), and let the
engine idle.
2.4L L4 Engine
If the engine coolant temperature
warning light no longer displays, the
vehicle can be driven. Continue to
drive the vehicle slowly for about
10 minutes. Keep a safe vehicle
distance from the vehicle in front.
If the warning does not come back
on, continue to drive normally. 3.6L V6 Engine
If the temperature overheat gauge is
no longer in the overheat zone or an
engine coolant temperature warning
light no longer displays, the vehicle
can be driven. Continue to drive the
vehicle slowly for about 10 minutes.
Keep a safe vehicle distance from
the vehicle in front. If the warning
does not come back on, continue to
drive normally.
If the warning continues, pull over,
stop, and park the vehicle
right away.
If there is no sign of steam, idle the
engine for three minutes while
parked. If the warning is still
displayed, turn off the engine until it
cools down. Also, see
Overheated
Engine Protection Operating Mode
on page 10‑21.

Black plate (40,1)Buick LaCrosse Owner Manual - 2012
10-40 Vehicle Care
Mini Fuses Usage1 Transmission
Control
Module
—Battery
2 Engine Control
Module Battery
3 Air Conditioning
Compressor Clutch
5 Engine Control
Module Run/Crank
8 Ignition
Coils
—Even (Six
Cylinder Engine),
Ignition Coils —All
(Four Cylinder
Engine
9 Ignition Coils
—Odd
(Six Cylinder
Engine)
10 Engine Control
Module
—Switched
Battery (from Engine
Control Module
Relay) Mini Fuses Usage
11 Six Cylinder Engine:
Post Catalytic
Converter Oxygen
Sensor Heater,
Mass Air Flow
Sensor, Flex Fuel
Sensor
13 Run/Crank for
Transmission
Control Module and
Fuel System Control
Module
14 Cabin Heater
Coolant Pump
(eAssist)
15 Motor Generator
Unit Coolant Pump
(eAssist)
16 Run/Crank for
eAssist Power
Inverter Module
17 Airbag
Module
—Run/
Crank Mini Fuses Usage
18 Vented Seats
(eAssist)
23 Variable Effort
Steering
(if equipped) or
eAssist Power
Inverter Module
29 Power Lumbar, Left
30 Power Lumbar,
Right or Power Pack
Cooling Fan
(eAssist)
31 Passive Entry/
Passive Start
Module
—Battery 1
(eAssist)
32 Body Control
Module 6
33 Heated
Seat
—Front
34 Antilock Brake
System Valves
35 Amplifier

Black plate (41,1)Buick LaCrosse Owner Manual - 2012
Vehicle Care 10-41
Mini Fuses Usage36 Adaptive Forward
Lighting (AFL)
Motors
—Battery
37 Right High Beam
38 Left High Beam
46 Cooling Fan Relay
47 Six Cylinder Engine:
Pre Catalytic
Converter Oxygen
Sensor Heater,
Canister Purge
Solenoid. Four
Cylinder Engine: Pre
and Post Catalytic
Converter Oxygen
Sensor Heaters,
Canister Purge
Solenoid, Mass Air
Flow Sensor.
48 Fog Lamps
49 Right High Intensity
Discharge
Headlamp Mini Fuses Usage
50 Left High Intensity
Discharge
Headlamp
51 Horn
52 Cluster Run/Crank
53 Run/Crank for Inside
Rearview Mirror,
Rear Vision Camera
54 Run/Crank for:
Heating, Ventilation
and Air Conditioning
55 Outside Rearview
Mirror, Universal
Garage Door
Opener, Front
Window Switches
56 Windshield Washer
60 Heated Mirror
62 Canister Vent
64 Adaptive Forward
Lighting (AFL)
Module
—Battery Mini Fuses Usage
65 Not Used
66 AIR Solenoid
(eAssist)
67 Fuel System Control
Module
69 Regulated Voltage
Control Sensor
70 Ultrasonic Parking
Assist/Side
Blind Zone
Mini Relays Usage 7 Engine Control
Module
9 Cooling Fan
13 Cooling Fan
15 Run/Crank
16 AIR Pump
17 Rear Window
Defogger

Black plate (42,1)Buick LaCrosse Owner Manual - 2012
10-42 Vehicle Care
Micro
Relays Usage
1 Air Conditioning
Compressor Clutch
2 Starter
4 Wiper Speed
5 Wiper Control
6 Cabin Heater
Coolant Pump
(eAssist)
10 Cooling Fan
14 Headlamp
Low Beam
Ultra Micro Relays Usage
11 Transmission
Auxiliary Oil Pump
(eAssist)Instrument Panel Fuse
Block
The instrument panel fuse block is
located in the instrument panel, on
the driver side of the vehicle. To
access the fuses, open the fuse
panel door by pulling down at
the top.
Press in on the sides of the door to
release it from the instrument panel.
Pull the door toward you to release
it from the hinge.

Black plate (43,1)Buick LaCrosse Owner Manual - 2012
Vehicle Care 10-43
Instrument Panel Fuse Block
The vehicle may not be equipped
with all of the fuses, relays, and
features shown. Fuses Usage
1 Steering Wheel
Controls Backlight
2 Body Control
Module 7
3 Body Control
Module 5
4 Radio
5 OnStar
6 Power Outlet 1
7 Power Outlet 2
8 Body Control
Module 1
9 Body Control
Module 4
10 Body Control
Module 8
(J‐Case Fuse) Fuses Usage
11 Front Heater
Ventilation Air
Conditioning/Blower
(J‐Case Fuse)
12 Passenger Seat
(Circuit Breaker)
13 Driver Seat (Circuit
Breaker)
14 Diagnostic Link
Connector
15 Airbag
16 Trunk
17 Heater Ventilation
Air Conditioning
Controller
18 Pre‐Fuse for Fuses
4 and 5

Black plate (44,1)Buick LaCrosse Owner Manual - 2012
10-44 Vehicle Care
FusesUsage
19 Infotainment and
Center Stack
Displays, Head‐Up
Display, Preferred
Device Interface
Module, Rear Seat
Infotainment
(eAssist)
20 Automatic Occupant
Sensing
21 Instrument Panel
Cluster
22 Discrete Logic
Ignition Switch Fuses
Usage
23 Body Control
Module 3
24 Body Control
Module 2
25 Rear Heater
Ventilation Air
Conditioning/Blower
26 AC/DC Inverter
Relays Usage
R1 Trunk Relay
R2 Not Used
R3 Power Outlet RelayRear Compartment Fuse
Block
The rear compartment fuse block is
located on the left side of the trunk
behind a cover. Vehicles with
eAssist do not have a rear
compartment fuse block.

Black plate (51,1)Buick LaCrosse Owner Manual - 2012
Vehicle Care 10-51
Tire Designations
Tire Size
The following is an example of a
typical passenger vehicle
tire size.
(A) Passenger (P‐Metric) Tire:
The United States version of a
metric tire sizing system. The
letter P as the first character in
the tire size means a passenger
vehicle tire engineered to
standards set by the U.S. Tire
and Rim Association.
(B) Tire Width
:The three‐digit
number indicates the tire section
width in millimeters from
sidewall to sidewall. (C) Aspect Ratio
:A two‐digit
number that indicates the tire
height‐to‐width measurements.
For example, if the tire size
aspect ratio is 60, as shown in
item C of the illustration, it would
mean that the tire's sidewall is
60 percent as high as it is wide.
(D) Construction Code
:A
letter code is used to indicate
the type of ply construction in
the tire. The letter R means
radial ply construction; the
letter D means diagonal or bias
ply construction; and the letter B
means belted‐bias ply
construction.
(E) Rim Diameter
:Diameter of
the wheel in inches.
(F) Service Description
:These
characters represent the load
index and speed rating of the
tire. The load index represents
the load carrying capacity a tire is certified to carry. The speed
rating is the maximum speed a
tire is certified to carry a load.
Tire Terminology and
Definitions
Air Pressure:The amount of
air inside the tire pressing
outward on each square inch of
the tire. Air pressure is
expressed in kPa (kilopascal)
or psi (pounds per square inch).
Accessory Weight
:The
combined weight of optional
accessories. Some examples of
optional accessories are
automatic transmission, power
steering, power brakes, power
windows, power seats, and air
conditioning.
Aspect Ratio
:The relationship
of a tire's height to its width.

Black plate (2,1)Buick LaCrosse Owner Manual - 2012
12-2 Technical Data
Vehicle Data
Capacities and Specifications
ApplicationCapacities
Metric English
Air Conditioning Refrigerant R134a For the air conditioning system refrigerant charge
amount, see the refrigerant label located under the hood. See your dealer for more information.
Engine Cooling System 2.4L L4 Engine 9.6 L 10.1 qt
3.6L V6 Engine 7.1 L 7.5 qt
Engine Oil with Filter
2.4L L4 Engine 4.7 L 5.0 qt
3.6L V6 Engine 5.7 L 6.0 qt
Fuel Tank
2.4L L4 Engine 60.0 L 15.8 gal
3.6L V6 Engine, AWD 74.0 L 19.5 gal
3.6L V6 Engine, FWD 70.5 L 18.6 gal