2002 CADILLAC DEVILLE heating

2-107
HEADLAMPS SUGGESTED - 23: If it's dark enough
outside and the headlamps and Twilight Sentinel

controls are off, this message will display on the DIC.
This message informs the driver that turning on the
exterior lamps is recommended even though the DRL
are still illuminated. It has become dark enough outside
to require the headlamps and/or other exterior lamps.
This message will also appear if the optional
Rainsense wiping feature is on and the Twilight
Sentinel is off.
ICE POSSIBLE
- 13: This message appears when
the outside air temperature is cold enough to create icy
road conditions.
LEFT REAR DOOR AJAR
- 142: The left rear door
is open or ajar when this message appears. The ignition
must be in ON and the transaxle not in PARK (P) for
this message to display. A chime will sound if the
vehicle's speed is greater than 3 mph (5 km/h).
OIL PRESSURE LOW STOP ENGINE
- 35: If this
message appears while the engine is running, stop the
engine and do not operate it until the cause of low oil
pressure is corrected. Severe damage to the engine can
result. A multiple chime will sound when this message
is displayed.PASSENGER DOOR AJAR
- 141: The right
front passenger's door is open or ajar when this
message appears. The ignition must be in ON and the
transaxle not in PARK (P) for this message to display.
A chime will sound if the vehicle's speed is greater
than 3 mph (5 km/h).
RIGHT REAR DOOR AJAR
- 143: The right
rear door is open or ajar when this message appears.
The ignition must be in ON and the transaxle not in
PARK (P) for this message to display. A chime
will sound if the vehicle's speed is greater than
3 mph (5 km/h).
SERVICE AC SYSTEM
- 14: 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 if you notice a
drop in heating and air conditioning efficiency.
SERVICE AIR BAG
- 83: There is a problem with the
air bag system when this message appears. Let only a
qualified technician work on your vehicle. Have your
vehicle serviced by your dealership immediately.
SERVICE CHARGING SYS
- 102: This message
will display when a problem with the charging system
has been detected. Have your vehicle serviced at
your dealership.

3-
3-1
Section 3 Comfort Controls and Audio Systems
In this section, you'll find out how to operate the comfort control and audio systems offered with your vehicle.
Be sure to read about the particular systems supplied with your vehicle.
3
-2 Comfort Controls
3
-2 Climate Control Panel
3
-6 Air Conditioning
3
-6 Heating
3
-6 Defogging and Defrosting
3
-7 Rear Window Defogger
3
-9 Ventilation System
3
-10 HVAC Steering Wheel Controls
3
-11 Climate Control Personalization (If Equipped)
3
-12 Audio Systems
3
-12 Setting the Clock
3
-12 AM-FM Stereo with Cassette Tape and
Compact Disc Player
3
-17 AM-FM Stereo with Cassette Tape and
Compact Disc Player with Radio Data
Systems (RDS), Digital Signal Processing
(DSP) and XM
Satellite Radio Service
(If Equipped)3
-27 Navigation/Radio System (Option)
3
-28 Glovebox-Mounted CD Changer (Option)
3
-30 Radio Personalization with Home and Away
Feature (If Equipped)
3
-31 Theft-Deterrent Feature
3
-32 Audio Steering Wheel Controls
3
-32 Understanding Radio Reception
3
-33 Tips About Your Audio System
3
-34 Care of Your Cassette Tape Player
3
-35 Care of Your Compact Discs
3
-35 Care of Your Compact Disc Player
3
-36 Diversity Antenna System
3
-36 XM Satellite Radio Antenna System
(If Equipped)

3-4
Automatic Operation
AUTO: This button is used to select the automatic
operation of the climate control system. When the
automatic operation is active, AUTO will appear on
the display.
A sensor will control the air delivery mode. Air will
come from the floor, the instrument panel or windshield
outlets. The fan speed and use of air conditioning
will vary as the system maintains the selected
temperature setting.
Do not cover the electronic solar sensor located on top
of the instrument panel near the windshield. The sensor
is used by the automatic system to regulate temperature.
See ªElectronic Solar Sensorº later in this section for
more information.
To find your comfort zone, start with the 75
F (24
C)
setting and allow about 30 minutes for the system to
regulate. Turn the driver's temperature knob to adjust
the temperature if necessary. If you choose 60
F
(16
C), the system will remain at that maximum cooling
setting and will not regulate fan speed. If you choose
90
F (32
C), the system will remain at that maximum
heating setting and will not regulate fan speed. Choosing
either maximum setting will not cause the system to heat
or cool any faster.In cold weather, when the system senses the need for
heat, the airflow will be directed out of the floor outlets.
As the interior temperature approaches the desired
setting, the fan speed will decrease. To maintain interior
comfort, the airflow may move to the instrument panel
air outlets and floor outlets (bi
-level mode). On bright
sunny days in cold weather, the airflow may come out of
the instrument panel outlets in A/C mode to maintain
comfort and prevent stuffiness.
When the automatic setting is active, the air
conditioning compressor cycles when needed to cool the
air. If your vehicle is sitting out on a hot day and AUTO
is active, the air will first flow out of the floor outlets for
a few seconds. This is normal. This is to remove hot air
from the air outlets. As the air is cooled, the airflow will
move through the instrument panel outlets. If you start
your vehicle with the fan setting on HI, it will skip the
air conditioning purge and the system will be in
manual mode.

3-6 Air Conditioning
On hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for your
vehicle to cool down. Then keep your windows closed
for the air conditioner to work its best.
Press the driver's temperature knob to turn the system
on manually. You may also need to adjust the
temperature and fan speed. The system will cool and
dehumidify the air inside the vehicle.
When the system is in AUTO, it will use recirculation as
necessary to cool the air.
Heating
Press MODE to select floor. Adjust the interior
temperature manually to a comfortable level. If the fan
speed needs adjustment, press the up or down arrow.
Outside air will be brought in, warmed and sent through
the floor, instrument panel outlets. The heater works
best if you keep your windows closed while using it.
In AUTO, the fan will not run at high speed to minimize
warm
-up time.
Defogging and Defrosting
Use FRONT on cool and humid days to keep the
windshield and side windows clear. This setting will
remove fog or ice from the windshield quickly in
extremely humid or cold conditions. If you desire to
have more air on your feet, turn the control to the
floor/defrost mode.
Press FRONT to activate the defrost mode. Adjust the
fan speed by pressing the up or down arrow on the fan
button. You may also adjust the temperature by turning
the driver's temperature knob. If you select floor/defrost
from AUTO, the system will control the fan speed and
temperature for you.
Recirculation is not available in the defrost mode, and
the A/C system cannot be turned off in this mode.

3-10
Ventilation Tips

Keep the hood and front air inlet free of ice, snow or
any other obstruction (such as leaves). The heater
and defroster will work far better, reducing the
chance of fogging the inside of the windows.

Keep the air path under the front seats clear of
objects. This helps circulate air throughout
your vehicle.
Passenger Compartment Air Filter
Passenger compartment air, both outside air and
recirculated air, is routed through a passenger
compartment filter. The filter removes certain
contaminants from the air, including pollen and dust
particles. Reductions in airflow, which may occur more
quickly in dusty areas, indicate that the filter needs to
be replaced early.
The filter should be replaced as part of routine
scheduled maintenance. See ªPassenger Compartment
Air Filterº in the Index for more information on
replacement. See ªMaintenance Scheduleº in the Index
for replacement intervals.
Your vehicle will not be damaged if you choose not to
replace the filter once the old one is removed.HVAC Steering Wheel Controls
(If Equipped)
Some heating and cooling
controls can be adjusted at
the steering wheel. Other
touch controls operate some
audio controls. See ªAudio
Steering Wheel Controlsº in
the Index.
~TEMP! (Temperature): Press the up arrow on the
control to increase the temperature and the down arrow
to decrease temperature manually.
!
~
(Fan): Press the up arrow on the control to
increase the fan speed and the down arrow to decrease
fan speed manually.

4-40 Driving On Grades
Reduce speed and shift to a lower gear before you start
down a long or steep downgrade. If you don't shift
down, you might have to use your brakes so much that
they would get hot and no longer work well.
On long uphill grades, reduce speed to 45 to 50 mph
(70 to 90 km/h) and avoid prolonged use of
SECOND (2) gear and engine speeds above 3800 rpm.
Climbing grades steeper than four percent at
temperatures above 90
F (32
C) with a loaded vehicle
and trailer is not recommended. The cooling system may
temporarily overheat. See ªEngine Overheatingº in
the Index.
Parking on Hills
CAUTION:
You really should not park your vehicle, with a
trailer attached, on a hill. If something goes
wrong, your rig could start to move. People can
be injured, and both your vehicle and the trailer
can be damaged.
But if you ever have to park your rig on a hill, here's
how to do it:
1. Apply your regular brakes, but do not shift
into PARK (P).
2. Have someone place chocks under the trailer wheels.
3. When the wheel chocks are in place, release the
regular brakes until the chocks absorb the load.
4. Reapply the regular brakes. Then shift into
PARK (P) firmly and apply your parking brakes.
5. Release the regular brakes.

4-41 When You Are Ready to Leave After
Parking on a Hill
1. Apply your regular brakes and hold the pedal down
while you:

start your engine,

shift into a gear, and

make sure the parking brake has released.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the chocks.
Maintenance When Trailer Towing
Your vehicle will need service more often when you're
pulling a trailer. See the Maintenance Schedule for more
on this. Things that are especially important in trailer
operation are automatic transaxle fluid (don't overfill),
engine oil, drive belt, cooling system and brake system.
Each of these is covered in this manual, and the Index
will help you find them quickly. If you're trailering, it's
a good idea to review this information before you start
your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
Engine Cooling When Trailer Towing
Your cooling system may temporarily overheat during
severe operating conditions. See ªEngine Overheatingº
in the Index.

5-
5-1
Section 5 Problems on the Road
Here you'll find what to do about some problems that can occur on the road.
5
-2 Hazard Warning Flashers
5
-3 Other Warning Devices
5
-3 Jump Starting
5
-10 Towing Your Vehicle
5
-10 Engine Overheating5
-13 Cooling System
5
-19 If a Tire Goes Flat
5
-20 Changing a Flat Tire
5
-30 Compact Spare Tire
5
-31 If You're Stuck: In Sand, Mud, Ice or Snow