2004 BUICK LESABRE cooling

Trunk
{CAUTION:
It can be dangerous to drive with the trunk lid
open because carbon monoxide (CO) gas can
come into your vehicle. You can’t see or smell
CO. It can cause unconsciousness and even
death. If you must drive with the trunk lid open
or if electrical wiring or other cable
connections must pass through the seal
between the body and the trunk lid:
Make sure all other windows are shut.
Turn the fan on your heating or cooling
system to its highest speed and select the
control setting that will force outside air
into your vehicle. See “Climate Control
System” in the Index.
If you have air outlets on or under the
instrument panel, open them all the way.
See “Engine Exhaust” in the Index.
Trunk Lock Release
To unlock the trunk from the outside, insert the master
key and turn it clockwise.
Remote Trunk Release Lockout
The TRUNK release button
is located on the driver’s
door trim map pocket.
Push this button to open the trunk. The transaxle must
be in PARK (P) or NEUTRAL (N) for the remote
trunk release button to work.
To lock the trunk from inside your vehicle, insert the
master key and turn it clockwise to LOCK. The VALET
key will not work in this procedure.
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Battery Load Management
The battery load management feature is designed to
monitor the vehicle’s electrical load and determine when
the battery is in a heavy discharge condition. During
times of high electrical loading, the engine may idle at a
higher RPM setting than normal to make sure the
battery charges. High electrical loads may occur when
several of the following are on: headlamps, high beams,
rear window defogger, fan at high speed, heated
seats (if equipped) and engine cooling fans.
If your vehicle’s battery remains in a heavy discharge
condition for a long period of time, the fan, rear
defogger, heated seats and heated mirrors will be
disabled and the DIC will display BATTERY SAVER
ACTIVE. This can happen either under long periods of
idling or low speed driving with high electrical loading,
or in the event of a charging system fault.
Head-Up Display (HUD)
{CAUTION:
If the HUD image is too bright, or too high in
your eld of view, it may take you more time to
see things you need to see when it is dark
outside. Be sure to keep the HUD image dim
and placed low in your eld of view.
If your vehicle is equipped with the Head-Up
Display (HUD), you can see some of the driver
information that appears on your instrument panel
cluster.
The information may be displayed in English or metric
units and appears as a reection in the windshield.
The HUD consists of the following information:
Speedometer Reading
Turn Signal Indicators
High-Beam Headlamp Indicator
Check Gages Message
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Climate Controls
Climate Control System
With this system you can control the heating, cooling
and ventilation for your vehicle.
TEMPERATURE:This lever is used to adjust the
temperature of the air coming through the system.
Moving the lever between COOL and WARM will change
the temperature of the air coming through your outlets.
9FAN:Move this lever to select the speed of
the fan. Moving the lever between LOW and HIGH will
decrease or increase the fan speed. The fan will be
off when the system is off.To change the current mode, select one of the following:
RECIRC (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 turn the recirculation mode on or
off. When the button is pressed, an indicator light
will come on. You may not use RECIRC with FRONT
defrost or BLEND.
VENT:This mode directs air to the instrument panel
outlets.
HTR (Heater):This mode directs most of the air to the
oor outlets with some air directed to the outboard
outlets (for the side windows) and some air directed to
the windshield.
BLEND:This mode splits the airow between the
windshield and the oor outlets. The air conditioning
compressor will be operating.
OFF:The ventilation system always allows fresh air to
ow through your vehicle when it is moving. The
system will try to keep the air at a previously chosen
temperature. When the system is off, the blower fan is
also off.
MAX (Maximum Air Conditioning):This mode directs
airow through the instrument panel outlets. The
amount of outside air entering your vehicle is limited.
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Also in this mode, the RECIRC function is activated to
create the maximum cooling effect in the vehicle. If
RECIRC was activated before selecting MAX, the light
in the RECIRC button will go off. If RECIRC is
selected after MAX, the light in the RECIRC button will
not come on.
NORM (Normal Air Conditioning):This mode cools
the outside air entering your vehicle and directs it
through the instrument panel outlets.
BI-LEV (Bi-Level Air Conditioning):This mode directs
about half of the air to the instrument panel outlets,
and then directs most of the remaining air to the oor
outlets. Some air may be directed toward the windshield.
Cooler air is directed to the upper outlets and warmer
air to the oor outlets. The air conditioning compressor is
on in this mode.
On hot days, open the windows to let hot inside air
escape; then close them. This helps to reduce the time
it takes for your vehicle to cool down. It also helps
the system to operate more efficiently.
For quick cool down on hot days, do the following:
1. Select the vent mode.
2. Select the recirculation mode.
3. Select MAX.
4. Select the coolest temperature.
5. Select the highest fan speed.Using these settings together for long periods of time
may cause the air inside of your vehicle to become too
dry. To prevent this from happening, after the air in
your vehicle has cooled, turn the recirculation mode off.
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.
Sensors
The solar sensor on your vehicle monitors the solar
radiation and the air inside of your vehicle, then uses the
information to maintain the selected temperature by
initiating needed adjustments to the temperature, the fan
speed and the air delivery system. The system may
also supply cooler air to the side of the vehicle facing the
sun. The recirculation mode will also be activated, as
necessary. Do not cover the solar sensor located in the
center of the instrument panel, near the windshield,
or the system will not work properly.
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. This mode allows you to clear fog or
frost from your windshield.
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1FRONT (Defrost):Pressing this button directs
most of the air to the windshield and the outboard outlets
(for the side windows), with some air directed to the
oor outlets. 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. Recirculation cannot be selected while
in the FRONT defrost mode. 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.
=REAR: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.
At speeds above 35 mph (55 km/h), the defogger will
operate continuously until you press the REAR
button again. After 10 minutes of driving below 35 mph
(55 km/h), the defogger will turn off automatically. If
you need additional warming time, push the button
again. The system will then operate for ve minutes
before going off by itself.If your vehicle has heated outside rearview mirrors, the
mirrors will heat to help clear fog or frost from the
surface of the mirror when the rear window defogger
button is pressed.
Notice:Using a razor blade or sharp object to clear
the inside rear window may damage the rear
window defogger. Repairs would not be covered by
your warranty. Do not clear the inside of the rear
window with sharp objects.
Dual Automatic Climate Control
System
With this system you can control the heating, cooling
and ventilation for your vehicle.
3-26

Use the up and down arrows on the AIR FLOW button
to cycle through the available modes.
WINDSHIELD-FLOOR:This mode directs most of
the airow to the windshield with some airow to
the outboard outlets (for the side windows) and the
oor outlets.
MID:This mode directs airow through the
instrument panel outlets.
MID-FLOOR:This mode directs airow through both
the oor and the instrument panel outlets. There is
also a small amount of air directed to the windshield
and the outboard outlets (for the side windows).
FLOOR:This mode directs most of the airow to
the oor outlets with some directed to the outboard
outlets (for the side windows) and the windshield.
OFF:Press the OFF button once to turn off the
passenger climate control, if it has been activated.
Pressing the OFF button a second time will turn off the
main system. The outside temperature will be shown
on the display when the system is off.
VENT (Flow-Through Ventilation):Pressing the VENT
button allows outside air to ow through your vehicle
without the air conditioning compressor working. To turn
off the VENT selection, press the VENT button again.
Selecting the VENT and AUTO buttons at the same time
allows the system to control the airow automatically
without using the air conditioning compressor or
the recirculation mode.RECIRC (Recirculation):Press this button to limit the
amount of outside air coming into 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 turn the recirculation
mode on or off. When the button is pressed, an indicator
light will come on. The recirculation mode cannot be used
with the FRONT defrost or VENT mode.
On hot days, open the windows to let hot air escape; then
close them. This helps to reduce the time it takes for your
vehicle to cool down. It also helps the system to operate
more efficiently.
For quick cool down on hot days, press the AUTO button
and the system will automatically enter recirculation
mode and the temperature will be at the full cold position
for maximum cooling.
Using these settings together for long periods of time may
cause the air inside of your vehicle to become too dry. To
prevent this from happening, after the air in your vehicle
has cooled, turn the recirculation mode off.
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.
3-28

Hill and Mountain Roads
Driving on steep hills or mountains is different from
driving in at or rolling terrain.If you drive regularly in steep country, or if you are
planning to visit there, here are some tips that can make
your trips safer and more enjoyable.
Keep your vehicle in good shape. Check all uid
levels and also the brakes, tires, cooling system
and transaxle. These parts can work hard on
mountain roads.
Know how to go down hills. The most important
thing to know is this: let your engine do some of
the slowing down. Shift to a lower gear when you go
down a steep or long hill.
{CAUTION:
If you do not shift down, your brakes could get
so hot that they would not work well. You
would then have poor braking or even none
going down a hill. You could crash. Shift down
to let your engine assist your brakes on a
steep downhill slope.
4-24

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.
Release the parking brake.
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 uid (don’t overll),
engine oil, drive belt, cooling system and brake system.
Each of these is covered in this manual, and the
Index will help you nd 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. SeeEngine Overheating on
page 5-26.
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