air conditioning CADILLAC CTS 2008 2.G Owners Manual

Climate Controls
Dual Climate Control System
The heating, cooling, and ventilation for the vehicle can
be controlled with this system.
O(Power):Press this button to turn the climate control
system on or off. When the climate control system is
turned off the air inlet defaults to outside air.
Automatic Operation
AUTO (Automatic):When this button is pressed and
the temperature is set, the system automatically
controls the inside temperature, the air delivery mode,
the air conditioning compressor, and the fan speed.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 60°F (15.5°C) and 90°F (32.2°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.
In cold weather, the system starts at reduced fan
speeds to avoid blowing cold air into the vehicle
until warmer air is available. The system begins
blowing air at the oor but may change modes
automatically as the vehicle warms up to maintain
the chosen temperature setting. The length of
time the system needs to 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.
You can switch from English to metric units through the
Driver Information Center (DIC). SeeDIC Vehicle
Customization on page 3-69.
3-24

The air-conditioning system removes moisture from the
air, so a small amount of water might drip underneath
the vehicle while it is idling or after the engine is turned
off is normal.
Do not cover the solar sensor located in the center of
the instrument panel, near the windshield. For more
information on the solar sensor, see “Sensors” later in
this section.
PASS (Passenger Climate Control):Press this button
to set a different temperature for the passenger.
Then press the passenger temperature adjustment
buttons to select a comfortable setting.
Pressing the PASS button again automatically sets the
passenger’s temperature to the driver’s setting.
Turning the passenger’s temperature display off does
not shut the climate control system for the passenger off.
Q/R(Temperature Adjustment):The temperature
can be adjusted separately for the driver and the
passenger. Press the up or down arrow buttons to
increase or decrease the automatic temperature
settings.
Manual Operation
HG(Mode):Press theHorGbuttons to change the
current airow mode. The current mode selection
appears in the display screen. Changing the mode
cancels the automatic operation and the system goes
into manual mode. Press AUTO to return to automatic
operation.
The outboard air outlets always receive some airow in
every mode, except defrost. SeeOutlet Adjustment
on page 3-28to change this airow from the outboard
outlets.
Y(Vent):This mode directs air to the instrument panel
outlets.
\(Bi-Level):This mode splits the air 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):This mode directs most of the air to the
oor outlets with some air directed to the outboard
outlets and a little air directed to the windshield.
The mode buttons can also be used to select the
defog and defrost modes. Information on defogging
and defrosting can be found later in this section.
3-25

DC(Fan):Press theDorCbuttons to increase or
decrease the fan speed. Pressing either button cancels
automatic operation and the system goes into manual
mode. Press AUTO to return to automatic operation.
The blower may reduce during an Onstar
®session
to limit background noise.
If the airow seems low when the fan speed is at
the highest setting, the passenger compartment air
lter might need to be replaced. For more information,
seePassenger Compartment Air Filter on page 3-29and
Scheduled Maintenance on page 6-4.
#(Air Conditioning):Press this button to override the
automatic system and turn the air conditioning system on
or off. When in AUTO, the air conditioning compressor
will come on automatically, as necessary.
The air conditioning system removes moisture from the
air, so a small amount of water might drip underneath the
vehicle while idling or after turning off the engine. This is
normal.
M/F(Recirculation/Outside Air):Press this
button to switch between recirculation and outside air.
Whenever the button is pressed, the indicator light
comes on for the mode being used. The recirculation
mode recirculates air inside the vehicle. It can be used
to prevent outside air and odors from entering the
vehicle or to help cool the air inside the vehicle more
quickly. Press the auto button to have the system select
the best air delivery mode for your temperature setting.
Recirculation is not available in the defrost mode and
automatically turns off 10 minutes after defog is selected.
This helps to limit window fogging in the vehicle.
Using recirculation for long periods of time could cause
the air inside the vehicle to become too dry or stuffy.
To prevent this from happening, after the air in the vehicle
has cooled, select outside air or press the auto button.
The outside air mode pulls fresh air from outside the
vehicle. Outside air is always selected in defrost mode to
prevent fogging.
_(Heated Windshield Washer, If Equipped):For
more information, seeWindshield Washer on page 3-12.
3-26

Defogging and Defrosting
Fog on the inside of windows is a result of high humidity
(moisture) condensing on the cool window glass.
This can be minimized if the climate control system
is used properly. There are two modes to clear fog
from the windshield. Use the defog mode to clear the
windows of fog or moisture and warm the passengers.
Use the defrost mode to remove fog or frost from
the windshield more quickly.
HG(Mode):Press the mode buttons until defog
appears on the display.
-(Defog):This mode directs the air between the
windshield, oor outlets and side windows. 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 mode
is selected while in defog mode, it will be cancelled after
10 minutes.
0(Defrost):Pressing defrost directs most of the air
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 may also cause the fan speed and air
temperature to increase.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog or frost from the rear window.
The rear window defogger will only work when the
ignition is in ON/RUN.
=(Rear Window Defogger):Press this button to turn
the rear window defogger on or off. Be sure to clear
as much snow from the rear window as possible.
The rear window defogger turns off about 15 minutes
after the button is rst pressed if the vehicle is moving
at slower speeds. At higher speeds, the rear window
defogger may stay on continuously. With each additional
press, the defogger runs for about 10 minutes.
The defogger can also be turned off by pressing the
button again or by turning off the engine.
The heated outside rearview mirrors will heat to help
clear fog or frost from the surface of the mirror when
the rear window defogger button is on. SeeOutside
Heated Mirrors on page 2-51.
Notice:Do not try to clear frost or other material
from the inside of the front windshield and rear
window with a razor blade or anything else that is
sharp. This may damage the rear window defogger
grid and affect your radio’s ability to pick up
stations clearly. The repairs wouldn’t be covered by
your warranty.
3-27

Electronic Key Not Detected Restart
Allowed
If your 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. Your vehicle may be near a strong
radio antenna signal causing the keyless access
system to be jammed. The vehicle will remain in
ACC/ACCESSORY until the vehicle is turned off or is
started, or ve minutes has expired. If you turn the
ignition off and you cannot nd the keyless access
transmitter, you will not be able to restart the vehicle.
The keyless access transmitter needs to be inside of the
vehicle in order for the vehicle to start. SeeStarting
the Engine on page 2-35for 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 3-40.
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 your 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.
Engine Oil Low Add Oil
If your vehicle has an oil level sensor, this message
displays if the oil level in the vehicle is low. Check the oil
level and correct it as necessary. You may need to let
the vehicle cool or warm up and cycle the ignition
to be sure this message clears.
This message clears itself after 10 seconds, until the
next ignition cycle. SeeEngine Oil on page 5-16
for additional information.
Engine Overheated Idle Engine
Notice:If you drive your vehicle while the engine is
overheating, severe engine damage may occur.
If an overheat warning appears on the instrument
panel cluster and/or DIC, stop the vehicle as soon as
possible. Do not increase the engine speed above
normal idling speed. SeeEngine Overheating
on page 5-31for more information.
This message displays when the engine coolant
temperature is too hot. Stop and allow the vehicle to
idle until it cools down. SeeEngine Coolant
Temperature Warning Light on page 3-40.
SeeOverheated Engine Protection Operating Mode on
page 5-33for information on driving to a safe place
in an emergency.
3-60

Rotate Control To Off Position
If your vehicle has the keyless access system,
this message displays when the ignition is in
ACC/ACCESSORY and the shift lever has just been
moved to PARK (P). The message displays as a
reminder to turn the ignition off. To avoid draining the
battery, make sure the ignition is turned off before
leaving the vehicle.
Service Air Bag
This message displays when there is a problem with the
airbag system. Have your vehicle serviced by your
dealer/retailer immediately. SeeAirbag Readiness Light
on page 3-34for more information.
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. Your 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 3-37for more information.
3-64

(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 range and speed rating of the
tire. The load index represents the load carry
capacity a tire is certied to carry. The load index
can range from 1 to 279. The speed rating is the
maximum speed a tire is certied to carry a load.
Speed ratings range from A to Z.
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.
5-63

Fuses Usage
A/C CLTCH Air Conditioning Clutch
ABS Antilock Braking System (ABS)
AFS Adaptive Forward Lighting System
AIRBAG IGN Airbag SwitchFuses Usage
AWD All-Wheel Drive
BCM 1 Body Control Module 1
BCM 2 Body Control Module 2
BCM 3 Body Control Module 3
5-124

J-Case Fuses Usage
ABS MTR ABS Motor
BLWR Blower
BRK VAC
PUMPBrake Vacuum Pump
FAN 1 Cooling Fan 1
FAN 2 Cooling Fan 2
REAR DEFOG Rear Defogger
SPARE Spare
SPARE Spare
SPARE Spare
STRTR Starter
TRANS PUMP Transmission Pump
WSW/HTR Windshield Washer Heater
Relays Usage
A/C CMPRSR
CLTCHAir Conditioning Compressor Clutch
DRL (W/O HID)
LO BEAM (HID)Daytime Running Lamps
(without High Intensity Discharge),
Low-Beam Headlamps
(High Intensity Discharge)
ENG PUMP Engine Pump
FAN S/P Cooling Fan Series/Parallel
Relays Usage
FAN 1 Cooling Fan 1
FAN 2 Cooling Fan 2
HEAD LAMP
WASHHeadlamp Washer
HI BEAM High-Beam Headlamp
HORN Horn
IGN 1 Ignition 1
LO BEAM
(W/O HID)
LT DRL (HID)Low-Beam (without High Intensity
Discharge), Left Daytime Running
Lamp (High Intensity Discharge)
PWR/TRN Powertrain
REAR DEFOG Rear Defogger
SPARE Spare
STRTR Starter
WPR Windshield Wiper
WPR HI Windshield Wiper High Speed
WSW PUMP Windshield Washer Pump
Rear Compartment Fuse Block
The rear compartment fuse block is located on top of
the battery, on the right side of the trunk. The battery
access door must be removed to access the fuse block.
5-126

Capacities and Specications
The following approximate capacities are given in English and metric conversions. SeeRecommended Fluids and
Lubricants on page 6-14for more information.
ApplicationCapacities
English Metric
Air Conditioning Refrigerant R134aFor the air conditioning system refrigerant charge
amount, see the refrigerant caution label located
under the hood. See your dealer/retailer for more
information.
Cooling System
3.6L HFV6 Engine (LY7) 10.3 qt 9.7 L
3.6L HFV6 Engine (LLT) 10.6 qt 10.0 L
Engine Oil with Filter
3.6L HFV6 Engine 6.0 qt 5.7 L
Fuel Tank 18.0 gal 68.1 L
Transfer Case 1.6 qt 1.0 L
5-129