2003 TOYOTA SEQUOIA cooling

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Idling for a long period with the air
conditioning on in stopandgo traffic.
Towing a trailer.
NOTICE
Do not remove the thermostat in
the engine cooling system as this
may cause the engine to overheat.
The thermostat is designed to con-
trol the flow of coolant to keep the
temperature of the engine within
the specified operating range.
 Do not continue driving with an
overheated engine. See “If your ve-
hicle overheats” on page 320 in
Section 4.
Normal
driving
Idling
The oil pressure gauge indicates engine
oil pressure when the ignition switch is
on. Check it while driving to make sure
that the needle is in the proper range.
If the oil pressure should stay below the
normal range, pull off the road to a safe
place and stop the engine immediately.
Call a Toyota dealer or qualified repair
shop for assistance.
Oil pressure may not build up when the
oil level is too low. The oil pressure
gauge is not designed to indicate oil level,
and the oil level must be checked using
the level dipstick.
NOTICE
Do not drive the vehicle with the oil
pressure below the normal range until
the cause is fixed—it may ruin the
engine.
Oil pressure gauge

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“AUTO” button
For automatic operation of the air condi-
tioning, press the “AUTO” button. An indi-
cator light will illuminate to show that the
automatic operation mode has been se-
lected.
In the automatic operation mode, the air
conditioning selects the most suitable fan
speed and air flow, onoff of the air condi-
tioning and air intake according to the
temperature.
When you press the “AUTO” button with
the air intake mode at FRESH, internal
circulation may be applied for maximum
cooling.
When you adjust the temperature selector
to maximum cooling, a “MAX COLD” mes-
sage will appear on the display and the
air intake mode will be automatically
changed to RECIRCULATE.
You may use manual controls if you want
to select your own settings.
To turn off the automatic operation, press
the “OFF” button.Fan speed selector
Turn the knob to adjust the fan speed—to
the right to increase, to the left to de-
crease.
In automatic operation, the fan speed is
adjusted automatically unless you desire
another fan speed mode.
Temperature selector
Turn the knob to adjust the temperatu-
re—to the right to warm, to the left to
cool.
The temperature display changes between
“
 C” and “ F” when the unit of the outside
temperature display is changed. (For de-
tails, see “Multiinformation display” on
page 254 in Section 19.)
“OFF” button
Push the button to turn off the air condi-
tioning system.
“MODE” button (air flow selector)
Press the button to select the vents used
for air flow.
In automatic operation, the air flow mode
is selected automatically among Panel, Bi
level and Floor unless you desire another
air flow mode.
1. Panel— Air flows mainly from the
instrument panel vents.

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2. Bilevel—Air flows from both the floor
vents and the instrument panel vents.
When you set the temperature selector
setting at about the middle in automatic
operation, warm air flows out of the
floor vents and relatively lowtempera-
ture air flows out of the center and
side vents.
3. Floor— Air flows mainly from the floor
vents.
It is recommended that you close the
lower vent. For details about this, see
“Instrument panel vents” on page 249
in this section.
4. Floor/Windshield— Air flows mainly
from the floor vents and windshield
vents.
Use with the air intake selector posi-
tioned in FRESH.
It is recommended that you close the
lower vent. For details about this, see
“Instrument panel vents” on page 249
in this section.
For details about air flow selector settings,
see “—Air flow selector settings” de-
scribed below.
Windshield air flow button
When this button is pressed, air flows
mainly from the windshield vents.
Pressing the button once again returns the
air flow mode to the last one used.
This button allows the air intake to select
FRESH automatically. This is to clean up
the front view more quickly. If you want
to return the setting to RECIRCULATE
mode, press the air intake selector button
once again.
Press the “A/C” button for dehumidified
heating or cooling. This setting clears the
front view more quickly. It is recommended that you close the low-
er vent. For details about this, see “Instru-
ment panel vents” on page 249 in this
section.
For details about air flow selector settings,
see “—Air flow selector settings” de-
scribed below.
For further information for removing frost
and fog, see “Instrument panel vents” on
page 249 in this section.

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If following another vehicle on a dusty
road, or driving in windy and dusty
conditions, it is recommended that the
air intake selector be temporarily set to
RECIRCULATE, which will close off the
outside passage and prevent outside
air and dust from entering the vehicle
interior.Heating
For best results, set controls to:
—For automatic operation
Press in the “AUTO” button.
Temperature— To the desired
temperature
Air conditioning—OFF
—For manual operation
Fan speed— To the desired fan speed
Temperature— To w a r d s WARM
(to the right)
Air intake—FRESH (outside air)
Air flow—FLOOR
Lower vent—CLOSED
Air conditioning—OFF
For quick heating, select recirculated
air for a few minutes. To keep the
windows from fogging, select fresh af-
ter the vehicle interior has been
warmed.
Press the “A/C” button on for dehumidi-
fied heating.
Choose floor/windshield air flow to heat
the vehicle interior while defrosting or
defogging the windshield. Air conditioning
For best results, set controls to:
—For automatic operation
Press in the “AUTO” button.
Temperature— To the desired
temperature
Air conditioning—ON
—For manual operation
Fan speed— To the desired fan speed
Temperature— To w a r d s COLD
(to the left)
Air intake—FRESH (outside air)
Air flow—PANEL
Air conditioning—ON
For quick cooling, select recirculated
air for a few minutes.

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Ventilation
For best results, set controls to:
—For automatic operationPress in the “AUTO” button.
Temperature— To w a r d s COLD
(to the left)
Air conditioning—OFF
—For manual operation
Fan speed— To the desired fan speed
Temperature— To w a r d s COLD
(to the left)
Air intake—FRESH (outside air)
Air flow—PANEL
Air conditioning—OFF
Defogging and defrosting
The inside of the windshield
For best results, set controls to:
—For automatic operation
Temperature— To w a r d s WARM
(to the right) to heat;
COLD (to the left)
to cool
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Lower vent—CLOSED
—For manual operation
Fan speed— To the desired fan speed
Temperature— To w a r d s WARM
(to the right) to heat;
COLD (to the left)
to cool
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Lower vent—CLOSED
Pressing the windshield air flow button
turns on the defogging function with the
purpose of clearing the front view.
When pressing the windshield air flow but-
ton, the air intake selects FRESH auto-
matically. This is to clean up the front
view more quickly. If you want to return the setting to RE-
CIRCULATE mode, press the air intake
selector button once again.
Press the “A/C” button for dehumidified
heating or cooling. This setting clears the
front view more quickly.
On humid days, do not blow cold air
on the windshield—the difference be-
tween the outside and inside tempera-
tures could make the fogging worse.
The outside of the windshield
For best results, set controls to:
—For automatic operation
Temperature— To w a r d s WARM
(to the right)
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Lower vent—CLOSED
—For manual operation
Fan speed— To the desired fan speed
Temperature— To w a r d s WARM
(to the right)
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Lower vent—CLOSED

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Pressing the windshield air flow button
turns on the defrosting function with the
purpose of clearing the front view.
When pressing the windshield air flow but-
ton, the air intake selects FRESH auto-
matically. This is to clean up the front
view more quickly.
If you want to return the setting to RE-
CIRCULATE mode, press the air intake
selector button once again.
Press the “A/C” button for dehumidified
heating or cooling. This setting clears the
front view more quickly.
To heat the vehicle interior while de-
frosting the windshield, choose
floor/windshield air flow.Side vents
Lower vent
If air flow control is not satisfactory, check
the instrument panel vents. The instrument
panel vents may be opened or closed as
shown.
For removing frost or fog, it is recom-
mended that you close the lower vent
when you push the windshield air flow
button or using the “Floor” or the “Floor/
windshield” mode.
Instrument panel vents

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CAUTION
Avoid inhaling the engine exhaust.
It contains carbon monoxide, which
is a colorless and odorless gas. It
can cause unconsciousness or even
death.
Make sure the exhaust system has
no holes or loose connections. The
system should be checked from
time to time. If you hit something,
or notice a change in the sound of
the exhaust, have the system
checked immediately.
Do not run the engine in a garage
or enclosed area except for the
time needed to drive the vehicle in
or out. The exhaust gases cannot
escape, making this a particularly
dangerous situation.
Do not remain for a long time in a
parked vehicle with the engine run-
ning. If it is unavoidable, however,
do so only in an unconfined area
and adjust the heating or cooling
system to force outside air into the
vehicle.
Keep the back door and back win-
dow closed while driving. An open
or unsealed back door and back
window, may cause exhaust gases
to be drawn into the vehicle.
To allow proper operation of your
vehicle’s ventilation system, keep
the inlet grilles in front of the wind-
shield clear of snow, leaves, or oth-
er obstructions.
If you smell exhaust fumes in the
vehicle, drive with the windows
open and the back door and back
window closed. Have the cause im-
mediately located and corrected.
FUNCTIONS OF ENGINE OIL
Engine oil has the primary functions of
lubricating and cooling the inside of the
engine, and plays a major role in main-
taining the engine in proper working order.
ENGINE OIL CONSUMPTION
It is normal that an engine should con-
sume some engine oil during normal
engine operation. The causes of oil
consumption in a normal engine are as
follows.
Oil is used to lubricate pistons, piston
rings and cylinders. A thin film of oil
is left on the cylinder wall when a pis-
ton moves downwards in the cylinder.
High negative pressure generated when
the vehicle is decelerating sucks some
of this oil into the combustion chamber.
This oil as well as some part of the oil
film left on the cylinder wall is burned
by the high temperature combustion
gases during the combustion process.
Engine exhaust cautionsFacts about engine oil
consumption

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Oil identification marks
Either or both API registered marks are
added to some oil containers to help
you select the oil you should use.
The API Service Symbol is located any-
where on the outside of the container.
The top portion of the label shows the oil
quality by API (American Petroleum Insti-
tute) designations such as SL. The center
portion of the label shows the SAE viscos-
ity grade such as SAE 5W30. “Energy
Conserving” shown in the lower portion,
indicates that the oil has fuelsaving ca-
pabilities.
The ILSAC (International Lubricant Stan-
dardization and Approval Committee) Certi-
fication Mark is displayed on the front of
the container.
To ensure excellent lubrication perfor-
mance for your engine, “Toyota Genuine
Motor Oil” is available, which has been
specifically tested and approved for all
Toyota engines.
Please contact your Toyota dealer for fur-
ther details about “Toyota Genuine Motor
Oil”.Look at the seethrough coolant reser-
voir when the engine is cold. The cool-
ant level is satisfactory if it is between
the “F” and “L” lines on the reservoir.
If the level is low, add ethyleneglycol
type coolant for a proper corrosion
protection of aluminum components.
The coolant level in the reservoir will vary
with engine temperature. However, if the
level is on or below the “L” line, add
coolant. Bring the level up to the “F” line.
Always use ethyleneglycol type coolant
for a proper corrosion protection of alumi-
num components. See information in the
next column.
If the coolant level drops within a short
time after replenishing, there may be a
leak in the system. Visually check the
radiator, hoses, radiator cap and drain
cock and water pump.
If you can find no leak, have your Toyota
dealer test the cap pressure and check
for leaks in the cooling system.
Checking the engine coolant
level