light BUICK CENTURY 2000 Service Manual

3-4
On cool, but sunny days, the sun may warm your upper
body, but your lower body may not be warm enough.
You can use BI
-LEV and set the temperature levers to a
comfortable setting. The system will bring in outside air
and direct it to your upper body, while sending slightly
warmed air to your lower body. You may notice this
temperature difference more at some times than others.
Push the A/C button on for cooling.
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.Automatic Control
For the most efficient operation, you should set the
system temperature and press AUTO. The system will
select the best fan speed and airflow settings to keep you
comfortable. The air conditioning compressor will run if
the outside temperature is above 40
F (4
C). You may
notice a delay of two to three minutes before the fan
comes on at start up in cool weather.
Temperature Control
The TEMP switch sets the temperature for the entire
system when the light on the DUAL button isn't lit.
If the DUAL button light is lit, this master temperature
control 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.
The driver's temperature and passenger's temperature
settings will be automatically maintained even if manual
overrides have been selected except for settings at 60
F
(15
C) and 90
F (32
C).
Setting the temperature to 90
F (32
C) 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.

3-5
Setting the temperature to 60
F (15
C) 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.
Passenger's Temperature 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.Hot Weather Example: When you start the vehicle in
hot weather, 80F (27C) or after being parked during
the day in full sun, if your driver set temperature is 75F
(23C) and you are in full automatic mode, the system
will automatically move the temperature to full cold.
The fan will be at low speed momentarily and then go
to the high speed. The air intake will be recirculated for
maximum cooling performance. As the interior of the
vehicle cools down to your desired comfort point, the fan
speed will decrease and the temperature will move to a
warmer position to maintain your desired comfort. As the
interior cools down or the sun load decreases the system
could switch to air delivered to A/C vents and the floor.
Cold Weather Example: When you start the vehicle in
cold weather, (below freezing) or after being parked
overnight. If your Driver Set Temperature is 75F (23C)
and you are in Full Automatic mode, the system will
automatically move the temperature doors to full hot.
The fan will start out at a low speed and will increase to
a higher speed as the engine warms up. The air will be
delivered to the floor. As the interior of the vehicle
warms up to your desired comfort point, the fan speed
will decrease and the temperature will move to a cooler
position to maintain your desired comfort. As the cabin
warms up or the sun load increases the system could
switch to air delivered to the windshield and the floor
(DEFOG mode).

3-6
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 buttons:
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 button 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 40F (4C).

MID/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: 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.
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 lit in the display.
The air conditioning compressor will run automatically
in this setting unless the outside temperature is
below 40F (4C).
VENT: This pushbutton 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.

3-7
RECIRC: 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 vehicles 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 disengaged.
Defogging and Defrosting

If you have the DUAL COMFORTEMP CLIMATE
CONTROL, your system has two settings for
clearing the front and side windows. To defrost the
windows quickly, press the DEF button with the
temperature knob all the way in the red area.For maximum defroster performance, set both
driver and passenger temperature controls to the
warmest setting.
To warm passengers while keeping the windows
clear, use BLEND.

If you have the DUAL AUTOMATIC
COMFORTEMP CLIMATE CONTROL, your
system has two settings for clearing the front and
side windows. To defrost the windows quickly, press
the FRONT button; set the temperature to 90 F
(32C), select high fan speed and turn the DUAL
button off. To warm passengers while keeping the
windows clear, push the AIR FLOW button until
WINDSHIELD/FLOOR appears in the display.
Select fan speed for comfort and windshield
clearing performance.

3-12
Setting the Tone
BASS: Press this knob lightly so it extends. Turn the
knob to increase or decrease bass.
TREB: Press this knob lightly so it extends. Turn the
knob to increase or decrease treble. If a station is weak
or noisy, you may want to decrease the treble.
Push these knobs back into their stored positions when
you're not using them.
Adjusting the Speakers
BAL: Turn the control behind the upper knob to move
the sound to the left or right speakers. The middle
position balances the sound between the speakers.
FADE: Turn the control behind the lower knob to move
the sound to the front or rear speakers. The middle
position balances the sound between the speakers.AM-FM Stereo with Cassette Tape Player
(If Equipped)
Playing the Radio
VOLUME: This knob turns the system on and off and
controls the volume. To increase volume and turn the
radio on, turn the knob clockwise. Turn it
counterclockwise to decrease volume.

3-14
Setting the Tone
BASS: Press this knob lightly so it extends. Turn the
knob to increase or decrease bass.
TREB: Press this knob lightly so it extends. Turn the
knob to increase or decrease treble. If a station is weak
or noisy, you may want to decrease the treble.
Push these knobs back into their stored positions when
you're not using them.
Adjusting the Speakers
BAL: Turn the control behind the upper knob to move
the sound to the left or right speakers. The middle
position balances the sound between the speakers.
FADE: Turn the control behind the lower knob to move
the sound to the front or rear speakers. The middle
position balances the sound between the speakers.
Playing a Cassette Tape
The longer side with the tape visible should face to the
right. If the ignition and the radio are on, the tape can be
inserted and will begin playing. If you hear nothing or
hear a garbled sound, the tape may not be in squarely.
Press EJECT to remove the tape and start over.While the tape is playing, use the VOLUME, FADE,
BAL, BASS and TREB controls just as you do for the
radio. Other controls may have different functions when
a tape is inserted. The display will show an arrow to
show which side of the tape is playing.
If you want to insert a tape when the ignition or radio is
off, first press EJECT or RECALL. Note that the
cassette tape adapter kits for portable compact disc
players will work in your cassette tape player.
Your tape bias is set automatically.
If E and a number appear on the radio display, the tape
won't play because of an error.

E10: The tape is tight and the player can't turn the
tape hubs. Remove the tape. Hold the tape with the
open end down and try to turn the right hub
counterclockwise with a pencil. Turn the tape over
and repeat. If the hubs do not turn easily, your tape
may be damaged and should not be used in the
player. Try a new tape to make sure your player is
working properly.

E11: The tape is broken. Try a new tape.
If any error occurs repeatedly or if an error can't be
corrected, please contact your dealer. If your radio
displays an error number, write it down and provide it
to your dealer when reporting the problem.

3-17
PUSHBUTTONS: The six numbered pushbuttons let
you return to your favorite stations. You can set up to
18 stations (six AM, six FM1 and six FM2). Just:
1. Turn the radio on.
2. Press AM
-FM to select the band.
3. Tune in the desired station.
4. Press TONE to select the setting you prefer.
5. Press and hold one of the six numbered buttons. The
sound will mute. When it returns, release the button.
Whenever you press that numbered button, the
station you set will return and the tone you selected
will be automatically selected for that button.
6. Repeat the steps for each pushbutton.
P SCAN: Press this button to listen to each of your
preset stations for a few seconds. The radio will go to
the first preset station, stop for a few seconds, then go
on to the next preset station. Press P SCAN again to
stop scanning. If a preset station has weak reception,
the radio will not stop at the preset station.AUTO SET: Press this button and the system will seek
and set the 12 strongest FM or the 6 strongest AM
stations on your preset buttons (depending on which
band (AM or FM) you are listening to). AUTO SET
will flash while seeking and will remain on until this
function is complete. To return to the stations you
manually set, press AUTO SET again.
Setting the Tone
BASS: Press this knob lightly so it extends. Turn the
knob to increase or decrease bass.
TREB: Press this knob lightly so it extends. Turn the
knob to increase or decrease treble. If a station is weak
or noisy, you may want to decrease the treble.
Push these knobs back into their stored positions when
you're not using them.
TONE: This feature allows you to choose preset bass
and treble equalization settings designed for classical,
pop, rock, jazz, talk and country/western stations.
CLASS will appear on the display when you first press
TONE. Each time you press it, another setting will
appear on the display. Press it again after C & W
appears and MANUAL will appear. Tone control will
return to the BASS and TREB knobs. Also, if you use
the BASS and TREB knobs, control will return to them
and MANUAL will appear.

3-18
Adjusting the Speakers
BAL: Press this knob lightly so it extends. Turn the knob
to move the sound to the left or right speakers. The middle
position balances the sound between the speakers.
FADE: Press this knob lightly so it extends. Turn the
knob to move the sound to the front or rear speakers. The
middle position balances the sound between the speakers.
Push these knobs back into their stored positions when
you're not using them.
Playing a Cassette Tape
The longer side with the tape visible should face to the
right. If the ignition and the radio are on, the tape can be
inserted and will begin playing. If you hear nothing or
hear a garbled sound, the tape may not be in squarely.
Press EJECT to remove the tape and start over.
While the tape is playing, use the VOLUME, FADE,
BAL, BASS and TREB controls just as you do for the
radio. Other controls may have different functions when
a tape is inserted. The display will show an arrow to
show which side of the tape is playing.
If you want to insert a tape when the ignition or radio is
off, first press EJECT or RECALL. Note that the
cassette tape adapter kits for portable compact disc
players will work in your cassette tape player.Your tape bias is set automatically.
If E and a number appear on the radio display, the tape
won't play because of an error.

E10: The tape is tight and the player can't turn the
tape hubs. Remove the tape. Hold the tape with the
open end down and try to turn the right hub
counterclockwise with a pencil. Turn the tape over
and repeat. If the hubs do not turn easily, your tape
may be damaged and should not be used in the
player. Try a new tape to make sure your player is
working properly.

E11: The tape is broken. Try a new tape.
If any error occurs repeatedly or if an error can't be
corrected, please contact your dealer. If your radio
displays an error number, write it down and provide it
to your dealer when reporting the problem.
PREV (1): Press this button to search for the previous
selection on the tape. Your tape must have at least three
seconds of silence between each selection for PREV to
work. The sound will mute while seeking.
NEXT (2): Press this button to search for the next
selection on the tape. Your tape must have at least three
seconds of silence between each selection for NEXT to
work. The sound will mute while seeking.

3-21
SCAN: Press one of the SEEK arrows for two seconds
and SCAN will appear on the display. Use SCAN to
listen to stations for a few seconds. The radio will go to
a station, stop for a few seconds, then go on to the next
station. Press one of the SEEK arrows again to stop
scanning. The sound will mute while scanning.
PUSHBUTTONS: The six numbered pushbuttons let
you return to your favorite stations. You can set up to
18 stations (six AM, six FM1 and six FM2). Just:
1. Turn the radio on.
2. Press AM
-FM to select the band.
3. Tune in the desired station.
4. Press TONE to select the setting you prefer.
5. Press and hold one of the six numbered buttons. The
sound will mute. When it returns, release the button.
Whenever you press that numbered button, the
station you set will return and the tone you selected
will be automatically selected for that button.
6. Repeat the steps for each pushbutton.P SCAN: Press this button to listen to each of your
preset stations for a few seconds. The radio will go to
the first preset station, stop for a few seconds, then go
on to the next preset station. Press P SCAN again to
stop scanning. If a preset station has weak reception,
the radio will not stop at the preset station.
AUTO SET: Press this button and the system will seek
and set the 12 strongest FM or the 6 strongest AM
stations on your preset buttons. AUTO SET will flash
while seeking and will remain on until this function is
complete. To return to the stations you manually set,
press AUTO SET again.
Setting the Tone
BASS: Press this knob lightly so it extends. Turn the
knob to increase or decrease bass.
TREB: Press this knob lightly so it extends. Turn the
knob to increase or decrease treble. If a station is weak
or noisy, you may want to decrease the treble.
Push these knobs back into their stored positions when
you're not using them.

3-22
TONE: This feature allows you to choose preset bass
and treble equalization settings designed for classical,
pop, rock, jazz, talk and country/western stations.
CLASS will appear on the display when you first press
TONE. Each time you press it, another setting will
appear on the display. Press it again after C & W
appears and MANUAL will appear. Tone control will
return to the BASS and TREB knobs. Also, if you use
the BASS and TREB knobs, control will return to them
and MANUAL will appear.
Adjusting the Speakers
BAL: Press this knob lightly so it extends. Turn the
knob to move the sound to the left or right speakers.
The middle position balances the sound between
the speakers.
FADE: Press this knob lightly so it extends. Turn the
knob to move the sound to the front or rear speakers. The
middle position balances the sound between the speakers.
Push these knobs back into their stored positions when
you're not using them.Playing a Cassette Tape
The longer side with the tape visible should face to the
right. If the ignition and the radio are on, the tape can be
inserted and will begin playing. If you hear nothing or
hear a garbled sound, the tape may not be in squarely.
Press EJECT to remove the tape and start over.
While the tape is playing, use the VOLUME, FADE,
BAL, BASS and TREB controls just as you do for the
radio. Other controls may have different functions when
a tape is inserted. The display will show an arrow to
show which side of the tape is playing.
If you want to insert a tape when the ignition or radio is
off, first press EJECT or RECALL.
Your tape bias is set automatically.
If E and a number appear on the radio display, the tape
won't play because of an error.

E10: The tape is tight and the player can't turn
the tape hubs. Remove the tape. Hold the tape with
the open end down and try to turn the right hub
counterclockwise with a pencil. Turn the tape over
and repeat. If the hubs do not turn easily, your tape
may be damaged and should not be used in the
player. Try a new tape to make sure your player is
working properly.