2008 TOYOTA TUNDRA cooling

183
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
The gauge indicates the engine coolant
temperature when the engine switch is
on. The engine operating temperature
will vary with changes in weather and
engine load.
If the needle moves into the red zone,
your engine is too hot. If your vehicle
overheats, stop your vehicle and allow the
engine to cool.
Your vehicle may overheat during severe
operating conditions, such as:
Driving up a long hill on a hot day.
Reducing speed or stopping after high
speed driving.
Idling for a long period with the air
conditioning on in stop−and− go 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
vehicle overheats” in Section 4.
XS16005
Normal
driving
Idling
Ty p e A
XS16006
Normal
driving
Idling
Ty p e B
Oil pressure gauge

383
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
Fan speed selector
Turn the knob to adjust the fan speed—to
the right to increase, to the left to de-
crease.
Temperature selector (driver side)
Turn the knob to adjust the temperature—
to the right to warm, to the left to cool.
“MAX A/C” position—Turning the tempera-
ture selector knob to the “MAX A/C” posi-
tion turns on the air conditioning and sets
the air intake selector to RECIRCULATE
for quick cooling. Temperature selector (passenger side)
Turn the knob to adjust the tempera-
ture—to the right to warm, to the left to
cool.
Independent setting—
When the passenger side selector is
in a position other than the “SYNC”
position, the temperature only on pas-
senger side can be adjusted using the
selector. This function is canceled
when the passenger side temperature
selector is turned to the “SYNC” posi-
tion.
Simultaneous setting— When the passenger side selector is
in the “SYNC” position, the tempera-
tures on both driver and passenger
sides can be simultaneously adjusted
using the driver side selector. This
function is canceled when the passen-
ger side temperature selector is
turned to the right.
G18021
Air flow selector
Turn the knob to select the vents used for
air flow.
1. Panel— Air flows mainly from the
instrument panel vents and the rear
vents.
2. Bilevel— Air flows from both the floor
vents, the instrument panel vents and
the rear vents.
3. Floor— Air flows mainly from the floor
vents.

384
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
4. Floor/Windshield—Air flows mainly
from the floor vents and windshield
vents.
Turning the air flow selector to the
floor/windshield position turns on the
defogging/defrosting function with the
purpose of clearing the windshield.
In this position, air intake selector
mode changes to FRESH automatically
to clear the windshield quickly. If you
want to return the setting to RECIRCU-
LATE mode, press the air intake selec-
tor button once again.
Press the “A/C” button for dehumidified
heating or cooling. This setting clears
the windshield more quickly.
5. Windshield— Air flows mainly from the
windshield vents.
Turning the air flow selector to the
windshield position turns on the defog-
ging/defrosting function and the air con-
ditioning with the purpose of clearing
the windshield.
In this position, air intake selector
mode changes to FRESH automatically
to clear the windshield quickly. It is not
possible to return to RECIRCULATE in
this position. In this position, the air conditioning
turns on regardless of the “A/C button
indicator comes on or goes off. This is
not a malfunction.
For details about air flow selector settings,
see “Air flow selector settings” described
below.
XS19014
Air intake selector
Press the button to select the air source.
1. Recirculate (indicator light is on)—Re-
circulates the air inside the vehicle.
2. Fresh (indicator light is off)—Draws
outside air into the system.
To prevent fogging up of the windshield,
the air intake mode may change automati-
cally to FRESH depending on the condi-
tion of the air conditioning system.

388
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
XS19013a
For quick cooling, turn the temperature
selector knob to the “MAX A/C” posi-
tion. The air conditioning will automati-
cally turn on and the air intake selector
will be set to RECIRCULATE.
Ventilation
For best results, set controls to:
Fan speed— Any setting except “OFF”
Temperature— Towards blue zone
Air intake—FRESH (outside air)
Air flow—PANEL
Air conditioning—OFF
Defogging
Condition: Moisture is on the inside of the
windshield.
For best results, set controls to:
Fan speed— Any setting except “OFF”
Temperature— Towards red zone to heat;
blue zone to cool
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Turning the air flow selector to the wind-
shield or floor/windshield position turns on
the defogging function with the purpose of
clearing the windshield.
When turning the air flow selector to wind-
shield or floor/windshield position, air in-
take selector mode changes to FRESH
automatically to clear the windshield
quickly. If you want to return the setting
to RECIRCULATE mode, press the air in-
take selector button once again. However,
if the air flow selector is in the windshield
position, it is not possible to return to
RECIRCULATE.
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.
When side windows fog up, turn the
side vents toward the windows.
Defrosting
Condition: Moisture is on the outside of
the windshield.
For best results, set controls to:
Fan speed— Any setting except “OFF”
Temperature— Towards red zone
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Turning the air flow selector to the wind-
shield or floor/windshield position turns on
the defrosting function with the purpose of
clearing the windshield.
When turning the air flow selector to wind-
shield or floor/windshield position, air in-
take selector mode changes to FRESH
automatically to clear the windshield
quickly. If you want to return the setting
to RECIRCULATE mode, press the air in-
take selector button once again. However,
if the air flow selector is in the windshield
position, it is not possible to return to
RECIRCULATE.

389
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
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.

391
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
“AUTO” button
For automatic operation of the air condi-
tioning, press the “AUTO” button. The
“AUTO” button will turn on, indicating that
the automatic operation mode has been
selected.
In the automatic operation mode, the air
conditioning selects the most suitable fan
speed, air flow, air intake and on −off of
the air conditioning according to the tem-
perature.
When you press the “AUTO” button with
the air intake mode at FRESH, internal
circulation may be applied for maximum
cooling.
You may use manual controls if you want
to select your own settings.
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, you do not have
to adjust the fan speed unless you desire
another fan speed mode. “DUAL” button
Push the button to change the mode of
the temperature setting.
With the indicator on—
Individual temper-
ature setting for driver and front passen-
ger
With the indicator off— Simultaneous
temperature setting for driver and front
passenger
Temperature selectors
Turn the knob to adjust the tempera-
ture—to the right to warm, to the left to
cool.
“LO” appears when you adjust to maxi-
mum cooling, and “HI” appears when you
adjust to maximum warming.
—“TEMP” knob
With the “DUAL” button indicator on—This
knob changes the temperature on the driv-
er side only.
With the “DUAL” button indicator off—This
knob changes the temperature on the driv-
er side and front passenger side simulta-
neously. This function will be cancelled
when the “PASS TEMP” knob is turned. —“PASS TEMP” knob
This knob changes the temperature on the
front passenger side only.
“OFF” button
Push the button to turn off the air condi-
tioning system.

395
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
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 intake—FRESH (outside air)
Air conditioning—OFF
For manual operation—
Fan speed— To the desired fan speed
Temperature— Towards red zone
Air intake—FRESH (outside air)
Air flow—FLOOR
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 intake—FRESH (outside air)
Air conditioning—ON
For manual operation—
Fan speed— To the desired fan speed
Temperature— Towards blue zone
Air intake—FRESH (outside air)
Air flow—PANEL
Air conditioning—ON
For quick cooling, select recirculated
air for a few minutes.

447
2008 TUNDRA from Apr. ’08 Prod. (OM 34477U)
Keep your engine in good running
order. Malfunctions in the engine
electrical system, electronic ignition
system/distributor ignition system
or fuel systems could cause an ex-
tremely high threeway catalytic
converter temperature.
 If the engine becomes difficult to
start or stalls frequently, take your
vehicle in for a checkup as soon
as possible. Remember, your Toyota
dealer knows your vehicle and its
threeway catalytic converter sys-
tem best.
 To ensure that the threeway
catalytic converter and the entire
emission control system operate
properly, your vehicle must receive
the periodic inspections required by
the Toyota Maintenance Schedule.
For scheduled maintenance
information, refer to the “Scheduled
Maintenance Guide” or “Owner’s
Manual Supplement”.CAUTION
Exhaust gases include harmful car-
bon monoxide (CO) that is colorless
and odorless. Inhaling exhaust
gases may lead to death or a seri-
ous health hazard.
The exhaust should be checked
occasionally. If there is a hole or
crack caused by corrosion, damage
to a joint or abnormal exhaust
noise, be sure to have the vehicle
inspected and repaired by your
Toyota dealer. Failure to do so may
allow exhaust gases to enter the
vehicle, resulting in death or a
serious health hazard.
If the vehicle is in a poorly venti-
lated area, turn the engine off. In a
closed area, such as a garage, ex-
haust gases may collect and enter
the vehicle. This may lead to death
or a serious health hazard.
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 window closed while
driving. An open or unsealed 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 the smell of exhaust is noticed
inside the vehicle, open the win-
dows. Large amounts of exhaust in
the vehicle can cause driver drowsi-
ness and an accident, resulting in
death or a serious health hazard.
Have the vehicle inspected by your
Toyota dealer immediately.
Engine exhaust cautions