2008 CADILLAC DTS climate control

In order to prevent false temperature readings at
startup, the displayed temperature will not change
until the following occurs:
Vehicle speed is above 10 mph (16 km/h)
for 5 minutes.
Vehicle speed is above 32 mph (51 km/h)
for 2 and a half minutes.
The climate control system uses the information from
these sensors to maintain your comfort setting by
adjusting the outlet temperature, fan speed, and the
air delivery mode. The system may also supply cooler
air to the side of the vehicle facing the sun. The
recirculation mode will also be used as needed to
maintain cool outlet temperatures.
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 oor/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.
W(Floor/Defog):Turn the control to this mode to
direct approximately half of the air to the oor outlets
and the remaining air is directed to the side window
outlets and to the windshield. When you select
this mode, the system turns off recirculation and runs
the air conditioning compressor unless the outside
temperature is at or below freezing. The recirculation
mode cannot be selected while in the oor/defog mode.
0(Defrost):Turn the control to this mode to direct
most of the air to the windshield and the side window
outlets. In this mode, the system automatically turns off
recirculation and runs the air conditioning compressor,
unless the outside temperature is at or below freezing.
Recirculation cannot be selected while in the defrost
mode. Do not drive the vehicle until all the windows
are clear.
For professional vehicles, air will be allowed to ow
through the rear outlets. For quicker defrost, press the
AUX button on the front climate control system so
that the light is not lit.
3-47

Rear Climate Control System
If your vehicle has a rear climate control system,
the rear seat passengers can adjust the direction
of the airow, fan speed and temperature for the
rear seating area. This system also works with
the main climate control system in the vehicle.The control panel for this system is located on the back
of the center console.
Press the AUX button located on the front climate
control panel to turn the rear climate control system on
or off. When turned on the rear system operates in
automatic mode and the temperature settings selected
for the front climate control panel will also be selected
for the rear passengers.
To adjust the rear climate control system, the rear
passenger can select a different temperature, mode
or fan speed.
Whenever the rear passengers have adjusted settings
on the rear climate control system, the AUX light is
lit on the front climate control system.
When the front climate control system is turned off
or in defrost mode, the rear climate control system is
turned off. The rear system will turn back on once
another front mode is selected.
For more information on how to use the climate
control system, seeDual Climate Control System
on page 3-42. For more information on the air outlets,
seeOutlet Adjustment on page 3-48.
3-49

Automatic Operation
«A ª(Fan):Press this button until AUTO appears
on the display to place the system in automatic
mode. When automatic operation is active, the system
automatically controls the fan speed. If in auto fan
mode, pressing the up arrow button will cancel
automatic operation and places the system in manual
mode. If in auto mode, pressing the down arrow will
turn the rear climate control system off.
«Nª(Mode):Press the this button until AUTO
appears on the display to place the system in automatic
mode. When automatic operation is active, the system
automatically controls the air delivery mode.
Manual Operation
«A ª(Fan):Press these up or down arrow buttons
to increase or decrease the fan speed.
«bª(Temperature):Press these up or down arrow
buttons to increase or decrease the temperature for
the rear seat passengers. Once the rear setting
temperature is altered from following the front setting
temperature, it will no longer follow changes to the
front setting temperature until the front climate control
AUX button resets it.
«Nª(Mode):Press these buttons to change the air
delivery mode. If in AUTO air delivery mode, pressing
the up arrow button will cancel automatic operation and
place the system in manual mode.
Y(Vent):This mode directs air to the upper outlets.
%(Bi-Level):This mode splits the air between
the upper outlets and the oor outlets.
[(Floor):This mode directs the air to the oor
outlets.
For more information on how to use the front climate
control system, seeDual Climate Control System
on page 3-42.
For more information on the air outlets, seeOutlet
Adjustment on page 3-48. Be sure to keep the area
under the front seats clear of any objects so that the
air inside of the vehicle can circulate effectively.
3-50

SERVICE A/C SYSTEM
This message displays when the air delivery mode door
or 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 BATTERY CHARGING
SYSTEM
This message displays when a problem with the
charging system has been detected. The charging
system light also displays on the instrument panel
cluster. SeeCharging System Light on page 3-60for
more information. Have your vehicle serviced by
your dealer/retailer.
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 warning light may also be
displayed on the instrument panel cluster. SeeBrake
System Warning Light on page 3-60andAntilock Brake
System (ABS) Warning Light on page 3-61for more
information. If this happens, 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 is displayed or appears again when you
begin driving, the brake system needs service. See
your dealer/retailer as soon as possible. SeeBrakes
on page 5-37for more information.
SERVICE BRAKE SYSTEM
This message displays if the ignition is on to inform the
driver that the brake uid level is low. Have the brake
system serviced by your dealer/retailer as soon as
possible.
SERVICE LANE DEPARTURE SYSTEM
If your vehicle has the Lane Departure Warning
(LDW) system, this message may display to indicate
that the LDW system is not working properly.
If this message remains on after continued driving,
the system needs service. See your dealer/retailer.
SeeLane Departure Warning (LDW) on page 2-46for
more information.
SERVICE PARKING ASSIST
If your vehicle has the Ultrasonic Front and Rear
Parking Assist (UFRPA) system, this message displays
if there is a problem with the UFRPA system. Do not
use this system to help you park. SeeUltrasonic Front
and Rear Parking Assist (UFRPA) on page 2-40for
more information. See your dealer/retailer for service.
3-82

If you get the overheat warning with no sign of steam,
try this for a minute or so:
1. In heavy traffic, let the engine idle in NEUTRAL (N)
while stopped. If it safe to do so, pull off the road,
shift to PARK (P) or NEUTRAL (N) and let the
engine idle.
2. Set the climate controls to the highest heat setting
and fan speed and open the windows as necessary.
If you no longer have the overheat warning, you
can drive. Just to be safe, drive slower for about
10 minutes. If the warning does not come back on,
you can drive normally.
If the warning continues, pull over, stop, and park your
vehicle right away.
If there is still no sign of steam, idle the engine for
three minutes while you are parked. If you still have the
warning, turn off the engine and get everyone out of
the vehicle until it cools down. Also, see “Overheated
Engine Protection Operating Mode” later in this section.
You may decide not to lift the hood but to get service
help right away.Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and the
message ENGINE OVERHEATED STOP ENGINE is
displayed, an overheat protection mode which alternates
ring groups of cylinders helps prevent engine damage.
In this mode, you will notice a loss in power and engine
performance. This operating mode allows your vehicle
to be driven to a safe place in an emergency. 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, change the oil
and reset the oil life system. SeeEngine Oil
on page 5-15.
5-29

Uniform Tire Quality Grading
Quality grades can be found where applicable on
the tire sidewall between tread shoulder and
maximum section width. For example:
Treadwear 200 Traction AA
Temperature A
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration (NHTSA), which
grades tires by treadwear, traction, and
temperature performance. This applies only to
vehicles sold in the United States. The grades are
molded on the sidewalls of most passenger car
tires. The Uniform Tire Quality Grading (UTQG)
system does not apply to deep tread, winter-type
snow tires, space-saver, or temporary use
spare tires, tires with nominal rim diameters of
10 to 12 inches (25 to 30 cm), or to some
limited-production tires.
While the tires available on General Motors
passenger cars and light trucks may vary with
respect to these grades, they must also conform
to federal safety requirements and additional
General Motors Tire Performance Criteria (TPC)
standards.
Treadwear
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specied
government test course. For example, a tire
graded 150 would wear one and a half (1.5) times
as well on the government course as a tire
graded 100. The relative performance of tires
depends upon the actual conditions of their use,
however, and may depart signicantly from
the norm due to variations in driving habits, service
practices, and differences in road characteristics
and climate.
Traction – AA, A, B, C
The traction grades, from highest to lowest, are
AA, A, B, and C. Those grades represent the tire’s
ability to stop on wet pavement as measured under
controlled conditions on specied government test
surfaces of asphalt and concrete. A tire marked C
may have poor traction performance.
Warning
:The traction grade assigned to this
tire is based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.
5-74

Fuses Usage
7 Emission Device
8 Transmission, Ignition 1
9Engine Control Module (ECM),
Powertrain Control Module (PCM)
10Climate Control System, Instrument
Panel Cluster Ignition 1
11 Airbag System
12 Horn
13 Windshield Wiper
14 Fog Lamps
15 Right High-Beam Headlamp
16 Left High-Beam Headlamp
17 Left Low-Beam Headlamp
18 Right Low-Beam Headlamp
19 Windshield Washer Pump Motor
20 Left Front Cornering Lamp
21 Right Front Cornering Lamp
22 Air Pump (J-Case)
23Antilock Brake System (ABS)
(J-Case)Fuses Usage
24 Starter (J-Case)
25Antilock Brake System (ABS) Motor
(J-Case)
26 Cooling Fan 2 (J-Case)
27 Cooling Fan 1 (J-Case)
28 Windshield Washer Heater (J-Case)
Relays Usage
29 Powertrain
30 Starter
31 Cooling Fan 2
32 Cooling Fan 3
33 Cooling Fan 1
34 Air Conditioning Clutch
35 Air Injection Reactor (AIR) Solenoid
36 Ignition
37 Air Pump
5-103

Child Restraints (cont.)
Securing a Child Restraint in the
Center Front Seat Position........................1-49
Securing a Child Restraint in the
Right Front Seat Position..........................1-50
Where to Put the Restraint...........................1-40
Cleaning
Aluminum or Chrome-Plated Wheels..............5-96
Exterior Lamps/Lenses.................................5-94
Fabric/Carpet..............................................5-91
Finish Care.................................................5-94
Instrument Panel, Vinyl, and Other Plastic
Surfaces.................................................5-93
Interior.......................................................5-90
Leather......................................................5-92
Speaker Covers..........................................5-93
Tires..........................................................5-97
Underbody Maintenance...............................5-97
Washing Your Vehicle...................................5-94
Weatherstrips..............................................5-94
Windshield and Wiper Blades........................5-95
Wood Panels..............................................5-93
Climate Control System
Air Filter, Passenger Compartment.................3-51
Dual ..........................................................3-42
Outlet Adjustment........................................3-48
Rear ..........................................................3-49
Clock............................................................3-42
Clock, Setting.................................................3-97Coinholder(s)..................................................2-59
Collision Damage Repair..................................7-13
Compass.................................................1-9, 2-36
Content Theft-Deterrent....................................2-19
Control of a Vehicle.......................................... 4-3
Convenience Net............................................2-60
Coolant
Engine.......................................................5-24
Engine Temperature Gage............................3-64
Engine Temperature Warning Light.................3-63
Surge Tank Pressure Cap.............................5-27
Cooled Seats................................................... 1-3
Cooling System..............................................5-30
Cornering Lamps............................................3-37
Courtesy Lamps.............................................3-37
Cruise Control................................................3-16
Cruise Control, Forward Collision Alert (FAC)
System......................................................3-10
Cruise Control Light........................................3-68
Cupholders....................................................2-59
Customer Assistance Information
Courtesy Transportation................................7-11
Customer Assistance for Text Telephone (TTY)
Users....................................................... 7-6
Customer Assistance Offices........................... 7-6
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-7
Reporting Safety Defects to General Motors....7-16
3