2009 CADILLAC CTS air conditioning

Vehicle Symbol Chart
Here are some additional symbols that may be found on
the vehicle and what they mean. For more information
on the symbol, refer to the index.
9:Airbag Readiness Light
#:Air Conditioning
!:Antilock Brake System (ABS)
g:Audio Steering Wheel Controls or OnStar®
$:Brake System Warning Light
":Charging System
I:Cruise Control
B:Engine Coolant Temperature
O:Exterior Lamps
#:Fog Lamps
.:Fuel Gage
+:Fuses
i:Headlamp High/Low-Beam Changer
j:LATCH System Child Restraints
*:Malfunction Indicator Lamp
::Oil Pressure
}:Power
/:Remote Vehicle Start
>:Safety Belt Reminders
7:Tire Pressure Monitor
F:Traction Control
M:Windshield Washer Fluid
v

Climate Controls
Dual Climate Control System
The heating, cooling, and ventilation for the vehicle can
be controlled with this system.
A. Display
B. Fan Control
C. Power
D. AUTO
E. PASS (Passenger
Climate Control)
F. Defrost
G. Air Delivery Mode
ControlH. Temperature Control
and Heated Seat
I. Air Conditioning
J. Recirculation/
Outside Air
K. Heated Windshield
Washer
L. Rear Window
Defogger
Automatic Operation
AUTO (Automatic):The system automatically controls
fan speed, air delivery, and air conditioning in order
to heat or cool the vehicle to the desired temperature.
When the indicator light is on, the system is in full
automatic operation. If the air delivery mode or fan
setting is manually adjusted, the auto indicator turns
off and displays will show the selected settings.
1. Press the AUTO button.
2. Adjust the temperature to a comfortable setting
between 70°F (21°C) and 80°F (27°C).
Choosing the coldest or warmest temperature setting
will not cause the system to heat or cool any faster.
If the system is set at the warmest temperature
setting, it remains in manual mode at that
temperature and it will not go into automatic mode.
To avoid blowing cold air in cold weather, the system
delays turning on the fan until warm air is available.
The system starts out blowing air at the oor, but can
automatically change modes as the vehicle warms
up to maintain the chosen temperature setting.
The length of time needed for warm up depends on
the outside temperature and the length of time that
has elapsed since the vehicle was last driven.
3. Wait for the system to regulate. This may take from
10 to 30 minutes. Then adjust the temperature, if
necessary.
3-24

The outboard air outlets always receive some airow in
every mode, except defrost.
To change the current mode, select one of the following:
Y(Vent):Air is directed to the instrument panel outlets.
\(Bi-Level):Air is divided between the instrument
panel outlets and the oor outlets. In automatic
operation, cooler air is directed to the upper outlets
and warmer air to the oor outlets.
[(Floor):Air is directed to the oor outlets, with
some air directed to the windshield and outboard outlets.
-(Defog):This mode clears the windows of fog or
moisture. Air is directed to the windshield, oor and side
window outlets. When this mode is selected, the system
turns off recirculation and runs the air-conditioning
compressor unless the outside temperature is at or below
freezing. If recirculation is selected while in defog mode,
it is cancelled after 10 minutes.
0(Defrost):This mode clears the windshield of fog
or frost more quickly. Air is directed to the windshield,
with some air directed to the side windows. In this mode,
the system automatically turns off recirculation and runs
the air-conditioning compressor, unless the outside
temperature is at or below freezing.
This mode can also cause the fan speed and air
temperature to increase.
#(Air Conditioning):Press to turn the air conditioning
system on or off and override the automatic system.
When in AUTO, the air conditioning compressor comes
on automatically, as needed.
The air conditioning system removes moisture from
the air, so a small amount of water might drip under the
vehicle while idling or after turning off the engine.
This is normal.
3-26

If moving the transmitter to different locations within
the vehicle does not help, place the transmitter in the
center console transmitter pocket with the buttons facing
the front of the vehicle and then start the vehicle.
The vehicle’s battery voltage is low. The battery
voltage must be above 10 volts for the keyless
access transmitter to be detected properly.
Electronic Key Not Detected Restart
Allowed
If the vehicle has the keyless access system, this
message displays when the keyless access transmitter is
not detected inside the vehicle while you are trying to turn
the ignition off. The vehicle may be near a strong radio
antenna signal causing the keyless access system to be
jammed. If you have the keyless access transmitter with
you, get out of the vehicle and lock the doors. If you do
not have the keyless access transmitter with you, you will
be able to start the vehicle again within ve minutes, or
until the vehicle’s content theft deterrent system is armed.
SeeStarting the Engine on page 2-33for more
information.
Engine Hot A/C (Air Conditioning) Off
This message displays when the engine coolant
becomes hotter than the normal operating temperature.
SeeEngine Coolant Temperature Gage on page 3-42.
To avoid added strain on a hot engine, the air
conditioning compressor automatically turns off. When
the coolant temperature returns to normal, the air
conditioning compressor turns back on. You can
continue to drive the vehicle.
If this message continues to appear, have the system
repaired by your dealer/retailer as soon as possible
to avoid damage to the engine.
3-62

Service A/C System
This message displays when the electronic sensors that
control the air conditioning and heating systems are
no longer working. Have the climate control system
serviced by your dealer/retailer if you notice a drop in
heating and air conditioning efficiency.
Service All Wheel Drive
This message displays if a problem occurs with the
All-Wheel Drive (AWD) system. The vehicle will run in
2WD. This could be caused by:
An electronics problem
An AWD system oil overheat
Worn out or overheated clutch plates
Various electrical issues
If this message appears, stop as soon as possible
and turn off the ignition for 30 seconds. Restart
the vehicle and check for the message on the DIC
display. If the message is still displayed or appears
again when you begin driving, the system needs service.
See your dealer/retailer right away.
Service Battery Charging System
This message displays when there is a problem with the
generator and battery charging systems. Driving with this
problem could drain the battery. Turn off all unnecessary
accessories. Stop and turn off the vehicle as soon as it is
safe to do so. Have the electrical system checked by your
dealer/retailer. Under certain conditions, the charging
system light may also turn on in the instrument panel
cluster. SeeCharging System Light on page 3-38for
more information.
Service Brake Assist
This message displays if there is a problem with the
brake system. The brake system warning light and the
antilock brake system (ABS) warning light may also
display on the instrument panel cluster. SeeBrake
System Warning Light on page 3-39andAntilock Brake
System (ABS) Warning Light on page 3-40for more
information. Stop as soon as possible and turn off the
vehicle. Restart the vehicle and check for the message
on the DIC display. If the message displays immediately
or again after you begin driving, the brake system
needs service. See your dealer/retailer as soon as
possible. SeeBrakes on page 5-42for more information.
3-67

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 may 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 is displayed 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.
If the temperature overheat gage is no longer in the
overheat zone or an overheat warning no longer
displays, the vehicle can be driven. Continue to drive
the vehicle slow for about 10 minutes. Keep a safe
vehicle distance from the car in front of you. 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”
next in this section.
Overheated Engine Protection
Operating Mode
This operating mode allows your vehicle to be driven
to a safe place in an emergency. Should a hot engine
condition exist, an overheat protection mode which
alternates ring groups of cylinders helps prevent engine
damage. In this mode, there is a loss in power and engine
performance. Driving extended miles (km) and/or towing
a trailer in the overheat protection mode should be
avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any
repair. The engine oil will be severely degraded.
Repair the cause of coolant loss and change the oil.
SeeEngine Oil on page 5-18.
5-39

Tire Terminology and Denitions
Air Pressure:The amount of air inside the
tire pressing outward on each square inch of the
tire. Air pressure is expressed in pounds per
square inch (psi) or kilopascal (kPa).
Accessory Weight
:This means 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.
Belt
:A rubber coated layer of cords that is
located between the plies and the tread. Cords
may be made from steel or other reinforcing
materials.
Bead
:The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the rim.
Bias Ply Tire
:A pneumatic tire in which the plies
are laid at alternate angles less than 90 degrees
to the centerline of the tread.Cold Tire Pressure
:The amount of air pressure in
a tire, measured in pounds per square inch (psi) or
kilopascals (kPa) before a tire has built up heat
from driving. SeeInflation - Tire Pressure on
page 5-69.
Curb Weight
:The weight of a motor vehicle with
standard and optional equipment including the
maximum capacity of fuel, oil, and coolant,
but without passengers and cargo.
DOT Markings
:A code molded into the sidewall
of a tire signifying that the tire is in compliance
with the U.S. Department of Transportation (DOT)
motor vehicle safety standards. The DOT code
includes the Tire Identication Number (TIN),
an alphanumeric designator which can also identify
the tire manufacturer, production plant, brand,
and date of production.
GVWR
:Gross Vehicle Weight Rating. SeeLoading
the Vehicle on page 4-20.
GAWR FRT
:Gross Axle Weight Rating for the
front axle. SeeLoading the Vehicle on page 4-20.
GAWR RR
:Gross Axle Weight Rating for the
rear axle. SeeLoading the Vehicle on page 4-20.
5-66

Mini-Fuses Usage
A/C CLTCH Air Conditioning Clutch
ABS Antilock Braking System (ABS)
AFS Adaptive Forward Lighting SystemMini-Fuses Usage
AIRBAG IGN Airbag Switch
AWD All-Wheel Drive
BCM 1 Body Control Module 1
5-116