BUICK LACROSSE 2007 Owner's Manual

A. Coolant Recovery Tank
B. Pressure Cap
C. Electric Engine Cooling Fans
{CAUTION:
An electric engine cooling fan under the
hood can start up even when the engine
is not running and can injure you. Keep
hands, clothing, and tools away from any
underhood electric fan.
If the coolant inside the coolant recovery tank is
boiling, do not do anything else until it cools down.
The vehicle should be parked on a level surface.
3.6L V6 Engine
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When the engine is cold, the coolant level should
be at or above the cold ll line on the coolant
recovery tank. If it is not, there may be a leak at the
pressure cap or in the radiator hoses, heater hoses,
radiator, water pump, or somewhere else in the
cooling system.
{CAUTION:
Heater and radiator hoses, and other
engine parts, can be very hot. Do not
touch them. If you do, you can be burned.
Do not run the engine if there is a leak.
If you run the engine, it could lose all
coolant. That could cause an engine re,
and you could be burned. Get any leak
xed before you drive the vehicle.If there seems to be no leak, with the engine on,
check to see if the electric engine cooling fans
are running. If the engine is overheating, the fans
should be running. If the fans are not running,
the vehicle needs service.
Notice:Engine damage from running your
engine without coolant is not covered by your
warranty. SeeOverheated Engine Protection
Operating Mode on page 370for information
on driving to a safe place in an emergency.
Notice:Using coolant other than DEX-COOL®
may cause premature engine, heater core,
or radiator corrosion. In addition, the engine
coolant could require changing sooner, at
30,000 miles (50 000 km) or 24 months,
whichever occurs rst. Any repairs would not
be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your
vehicle.
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How to Add Coolant to the Coolant
Recovery Tank
{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can
boil before the proper coolant mixture will.
Your vehicle’s coolant warning system is
set for the proper coolant mixture. With
plain water or the wrong mixture, your
engine could get too hot but you would
not get the overheat warning. Your engine
could catch re and you or others could
be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
®coolant.If you have not found a problem yet, but the
coolant level is not at the cold ll line, add a
50/50 mixture of clean, drinkable water and
DEX-COOL
®engine coolant at the coolant
recovery tank. SeeEngine Coolant on page 363
for more information.
Notice:In cold weather, water can freeze and
crack the engine, radiator, heater core and
other parts. Use the recommended coolant
and the proper coolant mixture.
{CAUTION:
You can be burned if you spill coolant
on hot engine parts. Coolant contains
ethylene glycol and it will burn if the
engine parts are hot enough. Do not spill
coolant on a hot engine.
When the coolant level in the coolant recovery
tank is at the cold ll line, start the vehicle.
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If the overheat warning continues, there is one
more thing you can try. You can add the proper
coolant mixture directly to the cooling system
through the coolant ll neck under the pressure cap,
but be sure the system is cool before you do it.
{CAUTION:
Steam and scalding liquids from a hot
cooling system can blow out and burn you
badly. They are under pressure, and if you
turn the radiator pressure cap — even a
little — they can come out at high speed.
Never turn the cap when the cooling
system, including the radiator pressure
cap, is hot. Wait for the cooling system
and radiator pressure cap to cool if you
ever have to turn the pressure cap.
How to Add Coolant to the Radiator
(3.8L V6 Engine)
Notice:Your engine has a specic radiator
ll procedure. Failure to follow this procedure
could cause your engine to overheat and
be severely damaged.
1. You can remove the
radiator pressure
cap when the
cooling system,
including the radiator
pressure cap and
upper radiator hose,
is no longer hot.
Turn the pressure cap slowly counterclockwise
until it rst stops. Do not press down while
turning the pressure cap. If you hear a
hiss, wait for that to stop. A hiss means there
is still some pressure left.
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2. Then keep turning the pressure cap, but now
push down as you turn it. Remove the
pressure cap.
3. Open the coolant air
bleed valve located
on the thermostat
housing, near the
upper radiator hose.
SeeEngine Compartment Overview on
page 350for more information on location.4. Fill the radiator with the proper DEX-COOL
®
coolant mixture, up to the base of the ller
neck. SeeEngine Coolant on page 363for
more information about the proper coolant
mixture.
If you see a stream of coolant coming from the
air bleed valve, close the valve. Otherwise,
close the valve after the radiator is lled.
5. Rinse or wipe any spilled coolant from the
engine and the compartment.
6. Then ll the coolant recovery tank to the
cold ll line.
375

7. Put the cap back on the coolant recovery tank,
but leave the radiator pressure cap off.
8. Start the engine and let it run until you can
feel the upper radiator hose getting hot.
Watch out for the engine cooling fans.9. By this time, the coolant level inside the
radiator ller neck may be lower. If the level is
lower, add more of the proper DEX-COOL
®
coolant mixture through the ller neck until the
level reaches the base of the ller neck.
10. Then replace the radiator pressure cap.
At any time during this procedure if coolant
begins to ow out of the ller neck, reinstall
the pressure cap. Be sure the pressure cap
is hand-tight and fully seated.
11. Check the coolant in the recovery tank. The
level in the coolant recovery tank should be
at the cold ll line when the engine is cold.
376

How to Add Coolant to the Cooling
System (3.6L V6 Engine)
Notice:Your engine has a specic cooling
system drain and ll procedure. Failure
to follow this procedure could cause your
engine to overheat and be severely damaged.
If your engine’s cooling system needs to
be drained and re-lled, please see your dealer.
1. You can remove the
pressure cap when
the cooling system,
including the
pressure cap and
upper radiator hose
is no longer hot.
Turn the pressure cap slowly counterclockwise.
If you hear a hiss, wait for that to stop. A hiss
means that there is still some pressure left.
2. Then keep turning the pressure cap and
remove it.
{CAUTION:
You can be burned if you spill coolant
on hot engine parts. Coolant contains
ethylene glycol and it will burn if the
engine parts are hot enough. Do not spill
coolant on a hot engine.
3. Fill the cooling system with the proper
DEX-COOL
®coolant mixture, up to the base
of the ller neck. SeeEngine Coolant on
page 363for more information about
the proper coolant mixture.
4. Rinse or wipe any spilled coolant from the
engine and the compartment.
377

5. Then ll the coolant recovery tank to the
cold ll line.
6. Reinstall the coolant recovery tank cap and
the pressure cap.
7. If the coolant in the recovery tank is constantly
low, you should have your dealership service
department inspect the vehicle for leaks.
Power Steering Fluid
SeeEngine
Compartment Overview
on page 350for
reservoir location.
When to Check Power Steering Fluid
It is not necessary to regularly check power
steering uid unless you suspect there is a leak
in the system or you hear an unusual noise.
A uid loss in this system could indicate a problem.
Have the system inspected and repaired.
378

How to Check Power Steering Fluid
To check the power steering uid, do the following:
1. Turn the key off and let the engine
compartment cool down.
2. Wipe the cap and the top of the reservoir clean.
3. Unscrew the cap and wipe the dipstick with
a clean rag.
4. Replace the cap and completely tighten it.
5. Remove the cap again and look at the
uid level on the dipstick.
If your vehicle has the 3.8L V6 engine, the uid
level should be between the ADD and HOT marks
when the engine is cold, and at the HOT mark
when the engine is hot. If the uid is at the
ADD mark when the engine is cold or hot, power
steering uid should be added.If your vehicle has the 3.6L V6 engine, the uid
level should be between the Min (Minimum)
and Max (Maximum) marks when the engine is
cold, and at the Max mark when the engine is hot.
If the uid is at the Min mark when the engine
is cold or hot, power steering uid should be
added.
What to Use
To determine what kind of uid to use, see
Recommended Fluids and Lubricants on page 470.
Always use the proper uid. Failure to use the
proper uid can cause leaks and damage hoses
and seals.
379

Windshield Washer Fluid
What to Use
When you need windshield washer uid, be sure
to read the manufacturer’s instructions before
use. If you will be operating your vehicle in an area
where the temperature may fall below freezing,
use a uid that has sufficient protection against
freezing.
Adding Washer Fluid
When the windshield washer uid is low, a low
washer uid light may appear on the instrument
panel cluster. SeeLow Washer Fluid Warning
Light on page 197for more information.
In addition, if your vehicle has a Driver Information
Center (DIC), the LOW WASHER FLUID
message will display when the uid level is low.
SeeDIC Warnings and Messages on page 208
for more information.Open the cap with the
washer symbol on it.
Add washer uid until
the tank is full. See
Engine Compartment
Overview on page 350
for reservoir location.
Notice:
When using concentrated washer uid,
follow the manufacturer’s instructions
for adding water.
Do not mix water with ready-to-use washer
uid. Water can cause the solution to
freeze and damage your washer uid tank
and other parts of the washer system.
Also, water does not clean as well
as washer uid.
Fill your washer uid tank only
three-quarters full when it is very cold.
This allows for expansion if freezing
occurs, which could damage the tank if
it is completely full.
Do not use engine coolant (antifreeze) in
your windshield washer. It can damage
your washer system and paint.
380