2007 CADILLAC CTS air conditioning

Climate Controls
Dual Climate Control System
With this system you can control the heating,
cooling, and ventilation for the vehicle.
Automatic Operation
AUTO (Automatic):When this button is pressed
and the temperature is set, the system will
automatically control the inside temperature, the air
delivery mode, the air conditioning compressor, and
the fan speed. AUTO will appear on the display.
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 you set the system at the warmest
temperature setting, the system will remain in
manual mode at that temperature and it will not
go into automatic mode.
In cold weather, the system will start at
reduced fan speeds to avoid blowing cold air
into your vehicle until warmer air is available.
The system will start out 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
needed for warm up will depend on the
outside temperature and the length of time
that has elapsed since your 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). If you have the
Base audio system, seeDIC Main Menu on
page 228. If you have the Navigation system, see
“Setup Menu” in the Index of the Navigation System
Owner Manual.
Uplevel Version Shown, Base Similar
189

The air-conditioning system removes moisture
from the air, so you may sometimes notice a small
amount of water dripping underneath your
vehicle while idling or after turning off the engine.
This 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.
Manual Operation
yNz(Mode):Pressing the mode switch and
changing the mode cancels automatic operation
and places the system in manual mode. Press
AUTO to return to automatic operation.
The outboard air outlets will always receive airow
regardless of the mode selected. SeeOutlet
Adjustment on page 194to change this airow
from the outboard outlets.To change the current mode, select one of the
following:
Y(Vent):This mode directs air to the instrument
panel outlets.
\(Bi-Level):This mode directs approximately
half of the air to the instrument panel outlets,
and then directs most of the remaining air to 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 (for the side windows), and a little
air directed to the windshield.
The mode switch can also be used to select the
defog mode. Information on defogging and
defrosting can be found later in this section.
yAz(Fan):Press this switch to increase or
decrease the fan speed. Pressing this switch
cancels automatic operation and places the system
in manual mode. Press AUTO to return to
automatic operation.
190

If the airow seems low when the fan speed is at
the highest setting, the passenger compartment air
lter may need to be replaced. For more
information, seePassenger Compartment Air Filter
on page 195andScheduled Maintenance on
page 462.
h(Recirculation):This mode keeps outside
air from coming in the vehicle. It can be used
to prevent outside air and odors from entering your
vehicle or to help heat or cool the air inside your
vehicle more quickly. Press this button to
switch between recirculation and fresh air. 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 will automatically turn off after 10 minutes
when defog is selected.
Using recirculation for long periods of time may
cause the air inside your vehicle to become too dry
or stuffy. To prevent this from happening, after
the air in your vehicle has cooled, turn the
recirculation mode off or press the auto button.
((Heated Seats):Press this button to turn on
the heated seats. The button on the left controls
the driver’s seat and the button on the right
controls the passenger’s seat. SeeHeated Seats
on page 10.
QPWRR(Power/Driver’s Temperature):Press
the PWR button located on the driver’s side of
the climate control panel to turn the entire climate
control system on or off. Press the up or down
arrow on the switch to increase or decrease
the automatic temperature setting.
QPWRR(Power/Passenger’s Temperature):
Press the PWR button located on the passenger’s
side of the climate control panel to allow the
passenger’s climate control setting to be different
than the driver’s. Press the up or down arrow on the
switch to increase or decrease the automatic
temperature setting for the front passenger.
A/C OFF (Air Conditioning):Press this button to
manually turn off the air conditioning compressor.
Press AUTO to return to automatic operation
or press the A/C OFF button again.
191

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 your 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.
yNz(Mode):Press this button 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.
If there is fog on the side windows, turn the
thumbwheel on the outboard outlets to the side
window defog position. SeeOutlet Adjustment on
page 194for more information.
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
will automatically turn off recirculation and run 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.
If there is fogging on the side windows, turn the
thumbwheel on the outboard outlets to the
side window defog position. SeeOutlet Adjustment
on page 194for more information. Do not drive
the vehicle until all the windows are clear.
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.
=(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.
193

Check Tire Pressure
If your vehicle has a Tire Pressure Monitor (TPM)
system, this message indicates that one or
more of the vehicle’s tires are low. SeeStatus of
Vehicle Systems on page 223for information
on checking your vehicle’s tire pressures. Also,
seeTire Pressure Monitor System on page 405
andInation - Tire Pressure on page 402for
more information.
Check Washer Fluid
When this message appears on the display, it
means that your vehicle is low on windshield
washer uid. You should rell the windshield
washer uid reservoir as soon as possible. See
Windshield Washer Fluid on page 369for
more information.
Competitive Driving (CTS-V)
When competitive driving mode is turned on with
the TC (traction control) button, this message
will be displayed on the DIC. The TC light will be
on when the competitive driving mode is on.
The Traction Control System (TCS) will not
operate while in competitive driving mode. You
should adjust your driving accordingly. Seethe CTS-V portion ofTraction Control System
(TCS) (CTS) on page 293orTraction Control
System (TCS) (CTS-V) on page 295for more
information.
Driver Door Ajar
When this message appears on the display, it
means that the driver’s door was not closed
completely. You should make sure that the driver’s
door is closed completely.
Engine Coolant Hot – AC
(Air Conditioning) Off
This message displays when the engine coolant
becomes hotter than the normal operating
temperature. To avoid added strain on a hot
engine, the air conditioning compressor is
automatically turned off. When the coolant
temperature returns to normal, the air conditioning
compressor will turn back on. You can continue
to drive your vehicle.
If this message continues to appear, have the
system repaired by your dealer as soon as
possible to avoid damage to the engine or
transmission.
236

Ice Possible
This message appears when the outside
temperature is cold enough to create icy road
conditions.
Left Rear Door Ajar
When this message appears on the display, it
means that the driver’s side rear door was
not closed completely. You should make sure that
the door is closed completely.
Oil Pressure Low – Stop Engine
Notice:If you drive your vehicle while the
engine oil pressure is low, severe engine
damage may occur. If a low oil pressure
warning appears on the instrument panel
cluster and/or DIC, stop the vehicle as soon as
possible. Do not drive the vehicle until the
cause of the low oil pressure is corrected. See
Engine Oil on page 346for more information.
Passenger Door Ajar
When this message appears on the display, it
means that the passenger’s side front door was
not closed completely. You should make sure that
the door is closed completely.
Right Rear Door Ajar
When this message appears on the display, it
means that the passenger’s side rear door was not
closed completely. You should check to make
sure that the door is closed completely.
Service AC (Air Conditioning) System
This message appears 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
if you notice a drop in heating and air conditioning
efficiency.
Service Air Bag
There is a problem with the airbag system when
this message appears. Have your vehicle serviced
by your dealer immediately. SeeAirbag Readiness
Light on page 201for more information.
Service Brake Assist
This message will display when a problem with
the panic brake assist system has been detected.
Have your vehicle serviced by your dealer.
238

(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.
397

Capacities and Specications
The following approximate capacities are given in English and metric conversions. SeeRecommended
Fluids and Lubricants on page 473for 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 for more
information.
Cooling System
2.8L HFV6 Engine 11.7 qt 11.1 L
3.6L HFV6 Engine 12.1 qt 11.8 L
6.0L V8 Engine 13.4 qt 12.7 L
Engine Oil with Filter
2.8L HFV6 Engine 6.0 qt 5.7 L
3.6L HFV6 Engine 6.0 qt 5.7 L
6.0L V8 Engine 6.0 qt 5.7 L
Fuel Tank 17.5 gal 66.2 L
457