2002 BUICK CENTURY air condition

2-68 Charging System Light
The charging system light
will come on briefly when
you turn on the ignition, as
a check to show you it's
working. Then it should
go out.
If it stays on, or comes on while you are driving, you
may have a problem with the charging system. It could
indicate that you have a loose accessory belt or another
electrical problem. Have it checked right away. Driving
while this light is on could drain your battery.
If you must drive a short distance with the light on, be
certain to turn off all your accessories, such as the radio
and air conditioner.
Brake System Warning Light
Your vehicle's hydraulic brake system is divided into
two parts. If one part isn't working, the other part can
still work and stop you. For good braking, though, you
need both parts working well.
If the warning light comes on, there is a brake problem.
Have your brake system inspected right away.
United States Canada
This light should come on briefly when you turn the
ignition key to RUN. If it doesn't come on then,
have it fixed so it will be ready to warn you if there's
a problem.

2-74
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
NOTICE:
Modifications made to the engine, transaxle,
exhaust, intake or fuel system of your vehicle or
the replacement of the original tires with other
than those of the same Tire Performance Criteria
(TPC) can affect your vehicle's emission controls
and may cause the SERVICE ENGINE SOON
light to come on. Modifications to these systems
could lead to costly repairs not covered by your
warranty. This may also result in a failure to pass
a required Emission Inspection/Maintenance test.
This light should come on, as a check to show you it is
working, when the ignition is on and the engine is not
running. If the light doesn't come on, have it repaired.
This light will also come on during a malfunction in one
of two ways:

Light Flashing
-- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.

Light On Steady
-- An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis and
service may be required.
If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:

Reducing vehicle speed.

Avoiding hard accelerations.

Avoiding steep uphill grades.

If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.

2-75
If the light stops flashing and remains on steady,
see ªIf the Light Is On Steadyº following.
If the light continues to flash, when it is safe to do so,
stop the vehicle. Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart the
engine. If the light remains on steady, see ªIf the Light
Is On Steadyº following. If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer or qualified service center for service.
If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully
install the cap. See ªFilling Your Tankº in the Index.
The diagnostic system can determine if the fuel cap
has been left off or improperly installed. A loose or
missing fuel cap will allow fuel to evaporate into the
atmosphere. A few driving trips with the cap properly
installed should turn the light off.
Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The condition
will usually be corrected when the electrical system
dries out. A few driving trips should turn the light off.Are you low on fuel?
As your engine starts to run out of fuel, your engine
may not run as efficiently as designed since small
amounts of air are sucked into the fuel line causing a
misfire. The system can detect this. Adding fuel should
correct this condition. Make sure to install the fuel cap
properly. See ªFilling Your Tankº in the Index. It will
take a few driving trips to turn the light off.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel. See
ªFuelº in the Index. Poor fuel quality will cause your
engine not to run as efficiently as designed. You may
notice this as stalling after start
-up, stalling when you put
the vehicle into gear, misfiring, hesitation on acceleration
or stumbling on acceleration. (These conditions may go
away once the engine is warmed up.) This will be detected
by the system and cause the light to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at least
one full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off,
have your dealer or qualified service center check the
vehicle. Your dealer has the proper test equipment and
diagnostic tools to fix any mechanical or electrical
problems that may have developed.

3-2
Comfort Controls
Dual ComforTemp
Climate Control
With this system, the driver and passenger can maintain
separate temperatures in their seating areas. The system
works best if you keep your windows closed while
using it.
FAN:
The left knob labeled FAN controls the fan speed.
Turn the knob clockwise toward HI to increase fan
speed and counterclockwise toward LO to decrease
fan speed. The fan must be turned on for the air
conditioning compressor to operate.If the airflow seems very low when the fan is adjusted
to the highest setting regardless of the mode setting,
your passenger compartment air filter may need to be
replaced. See ªMaintenance Scheduleº or ªPassenger
Compartment Air Filterº in the Index.
OFF: To turn off the fan turn the knob all the way
counterclockwise to OFF.
DRIVER (Driver's Side Temperature):
The lever on the left adjusts the air temperature on
the driver's side outlets independent of the temperature
set by the passenger. Slide the lever up to raise
the temperature. Slide the lever down to lower
the temperature.
PASSENGER (Passenger's Side Temperature):
The lever on the right adjusts the air temperature on the
passenger's side independent of the temperature set by
the driver. Slide the lever up to raise the temperature.
Slide the lever down to lower the temperature.

3-3
Mode Knob
The right knob has several settings to control the
direction of airflow.
MAX (Maximum Air Conditioning): This setting
recirculates much of the air inside your vehicle
and sends it through the instrument panel outlets.
The air conditioning compressor will run automatically
in this setting unless the outside temperature is below
40
F (4
C). (Even when the compressor is running,
you can control the temperature.)
VENT (Ventilation): This setting brings in outside
air and directs it through the instrument panel outlets.
BI
-LEV (Bi-Level): This setting brings in outside
air and directs it two ways. Half of the air is directed
through the instrument panel outlets. Most of the
remaining air is directed through the floor ducts and
a little to the defrost and side window vents.
HTR (Heater): This setting sends most of the air
through the ducts near the floor. The rest comes out of
the defroster and side window vents.BLEND: This setting allows half of the air to go to
the floor ducts and half to the defroster and side
window vents. The air conditioning compressor will
run automatically in this setting unless the outside
temperature is below 40
F (4
C). (Even when the
compressor is running, you can control the temperature.)
DEF (Defrost): This setting directs most of the air
through the defroster and side window vents. Some of
the air goes to the floor ducts and the side window vents.
The air conditioning compressor will run automatically
in this setting unless the outside temperature is below
40
F (4
C). (Even when the compressor is running,
you can control the temperature.)
A/C (Air Conditioning): Press this button to
turn the air conditioning on and off. The system will
cool and dehumidify the air inside the vehicle when the
A/C light is on.

3-4 Dual Automatic ComforTemp
Climate
Control (If Equipped)
With this system, you set a temperature. You can
then either let the system automatically control airflow
direction and force to maintain the temperature, or you
can manually adjust it. The system works best if you
keep your windows closed while using it.
Manual Control
If you prefer to manually control the heating,
cooling and ventilation in your vehicle, you can
select airflow direction, fan speed, outside or
recirculated air, air compressor and temperature
operation with the following:AIR FLOW: This control has several settings to
control the direction of airflow when the system is
not in AUTO.
To access the various modes available, continue to press
the AIR FLOW rocker switch up or down until the
desired mode appears in the display:
WINDSHIELD/FLOOR: This setting directs half
of the air to the floor ducts and half to the defroster
and side window vents. The air conditioning
compressor will run automatically in this setting
unless the outside temperature is below 40
F (4
C).
MID/FLOOR (Instrument Panel/Floor): This
setting directs half of the air through the instrument
panel outlets. Most of the remaining air is directed
through the floor ducts
and a little to the defroster and side window vents.
MID (Instrument Panel): This setting directs air
through the instrument panel outlets.
FLOOR: This setting sends most of the air through
the ducts near the floor. The rest comes out of the
defroster and side window vents. When in this
setting and the RECIRC setting, the windows can
fog up. See ªRECIRCº in the Index.

3-5
FAN: Press the up arrow to increase fan speed and
the down arrow to decrease fan speed. The fan must be
turned on for the air conditioning compressor to operate.
TEMP (Temperature): The TEMP switch sets the
temperature for the entire cabin when the light on the
DUAL light button isn't lit. When the DUAL button
light is lit, the TEMP switch sets the temperature for the
driver only. Press the up arrow to raise the temperature
and press the down arrow to lower the temperature. The
display will show your selection for a few seconds, then
the outside temperature will be displayed. If you push
the AUTO button, the system will control the fan speed
and airflow and will maintain the selected temperature.
VENT: This setting turns the air conditioning
compressor on and off. The indicator is lit when the
compressor is turned off. Recirculation is not permitted
when the compressor is off. The system will try to
control the temperature automatically, but without
the compressor.
VENT is not permitted in FRONT defrost mode. If the
VENT button is pushed while in FRONT defrost mode,
the indicator will light briefly and then turn off.RECIRC (Recirculation): This setting recirculates
much of the air inside your vehicle. This setting is
not permitted in FRONT defrost mode and is only
permitted in WINDSHIELD/FLOOR mode if the
compressor is turned on. The indicator light will be
lit when recirculation is engaged, but will light briefly
and then turn off if selected when not permitted.
Operating the climate control system in the RECIRC
mode may cause fogging of the vehicle's windows
when the weather is cold and damp. To clear the fog,
switch the system to either WINDSHIELD/FLOOR
or WINDSHIELD mode and increase the fan speed.
To avoid re
-fogging of the windows, operate the
system with RECIRC off.
FRONT: This setting brings in outside air
and directs most of the air through the defrost vent.
Some of the air also goes to the floor ducts and the
side window defogger outlets. The indicator on the
button will light and WINDSHIELD will be seen on
the display. The air conditioning compressor will run
automatically in this setting unless the outside
temperature is below 40
F (4
C).

3-6
PASSENGER Control: The PASSENGER CONTROL
buttons with the arrows adjust the temperature on the
passenger's side so it is warmer or cooler than the
temperature for the driver's side. Push the DUAL button
so that the indicator light is lit. Press the right arrow
button to raise the temperature. Press the left arrow
button to lower the temperature.
The display will not show the passenger's temperature,
only that of the driver. Indicators in the passenger
control section will show passenger's side temperature
relative to the driver's set temperature.

The amber light indicates the same temperature as
set for the driver.

The red lights indicate a warmer temperature than
that of the driver.

The blue lights indicate a cooler temperature than
that of the driver.
AUTO (Automatic Control): For the most efficient
operation, you should set the system temperature and
press AUTO. The system will then select the best fan
speed and airflow settings to keep you comfortable. The
air conditioning compressor will run if the outside
temperature is above 40F (4C). You may notice a
delay of two to three minutes before the fan comes on at
start up in cool weather.For the automatic system to function, the temperature
must be set between 61F (16C) and 89F (31C).
The driver's temperature and passenger's temperature
settings will be automatically maintained even if manual
overrides have been selected except for settings at
60F (15C) and 90F (32C).
Setting the temperature to 90F (32C) will lock
control in full hot, direct air to the floor, and increase
the fan speed to high. The system will not return to
automatic temperature control until the temperature
setting is lowered.
Setting the temperature to 60F (15C) will lock
control in full cold, recirculate interior air, direct air
to outlets on panel and increase blower speed to high.
The system will not return to automatic temperature
control until the temperature setting is raised.
OFF: Press this button to turn the air compressor off.
Heating
On cold days, use HTR with the driver and passenger
levers all the way in the red area. This system will bring
in outside air, heat it, and send it to the floor ducts.