2014 TOYOTA SIENNA radiator

678 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
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.
■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.
(Minimum temperature: -31 F [-35 C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55 % coolant and 45 % deionized water.
(Minimum temperature: -44 F [-42 C])
For more details about engine coolant, contact your Toyota dealer.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir caps 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.

680 4-3. Do-it-yourself maintenance
SIENNA_OM_OM45483U_(U)
Radiator and condenserCheck the radiator and condenser and clear away any foreign
objects.
If either of the above parts is extr emely dirty or you are not sure of
their condition, have your vehicle inspected by your Toyota dealer.
CAUTION
■When the engine is hot
Do not touch the radiator or condenser as they may be hot and cause seri-
ous injuries, such as burns.
■ When the electric cooling fan is operating
Do not touch the engine compartment.
Vehicles without a smart key system: With the engine switch in the “ON”
position, the electric cooling fans may automatically start to run if the air con-
ditioning is on and/or the coolant temperature is high. Be sure the engine
switch is in the “LOCK” position when working near the electric cooling fan or
radiator grille.
Vehicles with a smart key system: With the “ENGINE START STOP” switch
in IGNITION ON mode, the electric cooling fans may automatically start to
run if the air conditioning is on and/or the coolant temperature is high. Be
sure the “ENGINE START STOP” switch is OFF when working near the elec-
tric cooling fans or radiator grille.

790
5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
If your vehicle overheats
Correction proceduresStop the vehicle in a safe place and turn off the air condition-
ing system, and then stop the engine.
If you see steam: Carefully lift the hood after the steam subsides.
If you do not see steam: Carefully lift the hood.
After the engine has cooled
down sufficiently, inspect the
hoses and radiator core (radia-
tor) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
The following may indicate that your vehicle is overheating:
●The needle of the engine co olant temperature gauge (P. 246)
enters the red zone or a loss of engine power is experienced.
(For example, the vehicl e speed does not increase.)
● Steam is coming from under the hood.
STEP1
STEP2
STEP5STEP3

5
When trouble arises
791
5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
The coolant level is satisfactory if
it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL”
“LOW”
Radiator cap
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the engine and turn the air conditioning system on to
check that the radiator cooling fans operate and to check for
coolant leaks from the radiator or hoses.
The fans operate when the air conditioning system is turned on
immediately after a cold start. Conf irm that the fans are operating by
checking the fan sound and air flow. If it is difficult to check these,
turn the air conditioning system on and off repeatedly. (The fans may
not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately and contact your Toyota
dealer.
If the fans are operating: Have the vehicle inspected at the nearest Toyota dealer.
STEP4
STEP5
STEP6
STEP7

792 5-2. Steps to take in an emergency
SIENNA_OM_OM45483U_(U)
CAUTION
■To prevent an accident or injury when inspecting under the hood of
your vehicle
● If steam is seen coming from under the hood, do not open the hood until
the steam has subsided. The engine compartment may be very hot, caus-
ing serious injuries such as burns.
● Keep hands and clothing (especially a tie, a scarf or a muffler) away from
the fan and belts. Failure to do so may cause the hands or clothing to be
caught, resulting in serious injury.
● Do not loosen the radiator cap or the coolant reservoir cap while the
engine and radiator are hot. Serious injury, such as burns, may result from
hot coolant and steam released under pressure.
NOTICE
■When adding engine coolant
Wait until the engine has cooled down before adding engine coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot engine too
quickly can cause damage to the engine.
■ To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust
etc.).
● Do not use commercially available coolant additives.

862 Alphabetical index
SIENNA_OM_OM45483U_(U)
MaintenanceDo-it-yourself maintenance ....................... 665
General maintenance ............ 660
Maintenance data.................. 798
Maintenance requirements.... 657
Reset the maintenance data ..................................... 658
Meter
Instrument panel light control ................................. 247
Meters ................................... 246
Mirrors Conversation mirror............... 609
Inside rear view mirror........... 139
Side mirror heaters................421
Side mirrors ........................... 141
Vanity mirrors ........................ 607
Moon roof ................................. 151
MP3 disc ................................... 447
Multi-information display ........ 256
Noise from under vehicle ..........24
Odometer .................................. 246
Oil Engine oil .............................. 674
Opener Back door ................................82
Fuel filler door ....................... 156
Hood...................................... 669
Outer foot lights
Outer foot lights ..................... 582
Replacing light bulbs ............. 724
Wattage ................................. 809
Outside rear view mirrors Adjusting and folding ............. 141
Driving position memory........ 121
Overhead console .................... 594
Overheating, Engine ................790 Parking assist sensors............ 318
Parking brake ........................... 244
Parking lights
Replacing light bulbs ............. 724
Switch ................................... 270
Wattage................................. 809
PCS ........................................... 340
Personal lights Switch ................................... 583
Wattage................................. 809
Power back door ........................ 82
Power outlets ........................... 610
Power windows ................ 145, 149
Pre-collision system ................ 340
Quarter windows...................... 149
Radar cruise control ................ 302
Radiator .................................... 680
Radio ......................................... 428
Rear automatic air conditioning system ............. 417
Rear ceiling light ...................... 586
Rear manual air conditioning
system .................................... 414
Rear seat
Adjustment ............................ 100
Folding third seats......... 110, 111
Installing second seats.......... 108
Removing second seats........ 105
Stowing third seats........ 112, 114
Rear seat entertainment
system .................................... 504M
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