2010 TOYOTA SIENNA cooling

240
3-1. Using the air conditioning system and defogger
Front manual air conditioning system (if equipped)
Adjusting the settings
■ Adjusting the temperature setting
Turn the temperature control dial clockwise (warm) or counter-
clockwise (cool).
If is not pressed, the system will blow ambient temperature air or
heated air.
For quick cooling, turn the temperature control dial to the “MAX A/C”
position. The air conditioning will automatically turn on and the air circu-
lation mode will be set to recirculated air mode.
When the dial is in the “MAX A/C” position, the air conditioning system
cannot be turned off even if is pressed.
Front air conditioning
fan speed control dial Air outlet selection dial
Air conditioning on/off switch
Temperature
control dialOutside air or recirculated air mode
Rear air conditioning
fan speed control dial

432 4-3. Do-it-yourself maintenance
CAUTION
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury, observe the following precautions.
■When working on the engine compartment
●Keep hands, clothing, and tools away from the moving fan and engine
drive belt.
● Be careful not to touch the engine, radiator, exhaust manifold, etc. right
after driving as they may be hot. Oil and other fluids may also be hot.
● Do not leave anything that may burn easily, such as paper or rags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel or the bat-
tery. Fuel and battery fumes are flammable.
● Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.
● Take care because brake fluid can harm your hands or eyes and damage
painted surfaces.
If fluid gets on your hands or in your eyes, flush the affected area with
clean water immediately.
If you still experience discomfort, see a doctor.
● Do not touch the engine compartment when the electric cooling fan is
operating.
The electric cooling fan may keep rotating for about 3 minutes even after
the engine switch is turned to the “LOCK” position.
With the engine switch in the “ON” position, the electric cooling fan may
automatically start to run if the air conditioning is on and/or the coolant
temperature is high. Be sure the engine switch is in the “LOCK” position
and that the electric cooling fan is completely stopped when working near
the electric cooling fan or radiator grille.
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from
getting in the eyes.

438
4-3. Do-it-yourself maintenance
Engine compar tment
Power steering fluid reservoir( P. 448)
Windshield and rear window
washer fluid tank ( P. 453)
Engine oil filler cap ( P. 440)
Engine oil level dipstick ( P. 439)Engine coolant reservoir
( P. 444)
Brake fluid reservoir ( P. 446)
Fuse box ( P. 474)
Battery ( P. 450)
Electric cooling fans
Condenser ( P. 446)
Radiator ( P. 446)

444 4-3. Do-it-yourself maintenance
Engine coolantThe coolant level is satisfactory if it is between the “FULL” and “LOW”
lines on the reservoir when the engine is cold.
Reservoir cap
“FULL”
“LOW”
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, engine coolant reservoir cap, radiator
cap, drain cock and water pump.
If you cannot find a leak, have your Toyota dealer test the cap and check for
leaks in the cooling system.

445
4-3. Do-it-yourself maintenance
4
Maintenance and care
■
Coolant selection
Only use “Toyota Super Long Life Coolant” or similar high quality ethylene
glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant
with long-life hybrid organic acid technology.
U.S.A.: “Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deionized water. (Enabled: -31 F [-35 C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deionized water. (Enabled: -44 F [-42 C])
For more details about engine coolant, contact your Toyota dealer.
CAUTION
■ When the engine is hot
Do not remove the coolant reservoir cap.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing burns or other injuries.
NOTICE
■When adding engine coolant
Coolant is neither plain water nor stra ight antifreeze. The correct mixture of
water and antifreeze must be used to provide proper lubrication, corrosion
protection and cooling. Be sure to read the antifreeze or coolant label.
■ If you spill coolant
Be sure to wash it off with water to prevent damage to parts or paint.

446 4-3. Do-it-yourself maintenance
Radiator and condenserCheck the radiator and condenser, and clear any foreign objects.
If either of the above parts are ex tremely dirty or you are not sure of
their condition, have your vehicl e checked by your Toyota dealer.
Brake fluid
■ Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
“MAX”
“MIN”
CAUTION
■When the engine is hot
Do not touch the radiator or condenser as they may be hot and may cause
burns.
■ When the electric cooling fan is operating
Do not touch the engine compartment.
The electric cooling fan may keep rotating for about 3 minutes after the
engine switch is turned to the “LOCK” position.
With the engine switch in the “ON” position, the electric cooling fan may
automatically start to run if the air conditioning is on and/or the coolant tem-
perature is high. Be sure the engine switch is in the “LOCK” position and that
the electric cooling fan is completely stopped when working near the ele\
ctric
cooling fan or radiator grille.

479
4-3. Do-it-yourself maintenance
4
Maintenance and care
8 RAD NO.1 15 A Audio system
9 EFI NO.1 20 A
Multiport fuel injection system/
sequential multiport fuel injection
system, EFI NO.2
10 ALT-S 7.5 A Charging system
11 HAZ 15 A Turn signal lights, emergency
flashers
12 ECU-B 10 A Power sliding door, air conditioning
system, power windows, multiplex
communication system, meter and
gauge, wireless remote control sys-
tem
13 H-LP RH 15 A Right-hand headlight
14 H-LP LH 15 A Left-hand headlight
15 RAD NO.3 30 A Audio system
16 EFI NO.2 10 A Multiport fuel injection system/
sequential multiport fuel injection
system
17 A/F 25 A Multiport fuel injection system/
sequential multiport fuel injection
system
18 SPARE 15 A Spare fuse
19 SPARE 20 A Spare fuse
20 SPARE 30 A Spare fuse
21 SPARE 30 A Spare fuse
22 RR2 SEAT 50 A Power third seat
23 HTR 50 A Air conditioning system, A/C
24 FAN 50 A Electric cooling fans
25 PBD 30 A Power back door
26 R-PSD 30 A Right side power sliding door
FuseAmpereCircuit

5
When trouble arises
535
5-2. Steps to take in an emergency
NOTICE
■
When handling jumper cables
Be careful that the jumper cables do not become tangled in the cooling fans
or any of the belts when connecting or disconnecting them.