2012 TOYOTA SIENNA engine overheat

368 2-5. Driving information
SIENNA_U (OM45477U)●
Take care when passing other v ehicles. Passing requires consider-
able distance. After passing a vehi cle, do not forget the length of
your trailer, and be sure you hav e plenty of room before changing
lanes.
● To maintain engine braking efficiency and charging system perfor-
mance when using engine braking, do not put the transmission in
D.
Transmission shift range position must be in 4 in the S mode.
● Instability happens more frequently when descending steep or long
downhill grades. Before descending, slow down and downshift. Do
not make sudden downshifts while descending steep or long down-
hill grades.
● Avoid holding the brake pedal down too long or applying the
brakes too frequently. This could cause the brakes to overheat and
result in reduced braking efficiency.
● Due to the added load of the trailer, your vehicle’s engine may
overheat on hot days (at temper atures over 85°F [30°C]) when
driving up a long or steep grade. If the Engine coolant temperature
gauge overheating, immediately turn off the air conditioning (if in
use), pull your vehicle off the road and stop in a safe spot.
(  P. 775)

599
3-8. Other interior features
3
Interior features
SIENNA_U (OM45477U)
CAUTION
■
Burns
● Use caution when seating the following persons in a seat with the seat
heater on to avoid the possibility of burns:
• Babies, small children, the elderly, the sick and the physically chal-
lenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sleeping drugs, cold remedies, etc.)
● Do not cover the seat with anything when using the seat heater.
Using the seat heater with a blanket or cushion increases the temperature
of the seat and may lead to overheating.
● Do not use the seat heater more than necessary. Doing so may cause
minor burns or overheating.
NOTICE
■To prevent seat heater damage
Do not put heavy objects that have an uneven surface on the seat and do
not stick sharp objects (needles, nails, etc.) into the seat.
■ To prevent battery discharge
Turn the seat heaters off when the engine is not running.

When trouble arises5
721
SIENNA_U (OM45477U)
5-1. Essential informationEmergency flashers ......... 722
If your vehicle needs to be towed ............................. 723
If you think something is wrong ............................. 727
Fuel pump shut off system ........................... 728 5-2. Steps to take in an
emergency
If a warning light turns on or a warning buzzer
sounds... ........................ 729
If a warning message is displayed ........................ 744
If you have a flat tire (vehicles with run-flat
tires) ............................... 745
If you have a flat tire (vehicles with standard
tires) ............................... 747
If the engine will not start ................................ 762
If the shift lever cannot be shifted from P ................. 764
If you lose your keys ........ 766
If the electronic key does not operate properly....... 767
If the battery is discharged ..................... 770
If your vehicle overheats .. 775
If the vehicle becomes stuck .............................. 778
If your vehicle has to be stopped in an
emergency ..................... 780

5
When trouble arises
775
5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
If your vehicle overheats
If your engine overheats:
Stop the vehicle in a safe place and turn off the air condi-
tioning system.
Check to see if steam is coming out from under the hood.
If you see steam: Stop the engine. Carefully lift the hood after the steam
subsides and then restart the engine.
If you do not see steam: Leave the engine running and carefully lift the hood.
Check to see if the cooling fans are operating.
If the fans are operating: Wait until the temperature of the engine (shown on the
instrument cluster) begins to fall and then stop the
engine.
If the fans are not operating: Stop the engine immediately and call your Toyota dealer.
After the engine has cooled
down sufficiently, check the
engine coolant level and
inspect the radiator core (radi-
ator) for any leaks.STEP1
STEP2
STEP3
STEP5STEP4

776 5-2. Steps to take in an emergency
SIENNA_U (OM45477U)
■Overheating
If you observe the following, your vehicle may be overheating:
● The engine coolant temperature gauge enters the red zone or a loss of
power is experienced.
● Steam comes out from under the hood.
Add engine coolant if neces-
sary.
Water can be used in an emer-
gency if engine coolant is
unavailable.
(P. 790)
Have the vehicle inspected at the nearest Toyota dealer as soon as
possible.
STEP5

846 Alphabetical index
SIENNA_U (OM45477U)
CleaningExterior .................................. 630
Interior ...................................635
Seat belts ..............................636
Clock ................................. 252, 592
Compass ...................................617
Condenser ................................664
Console box ............................. 575
Conversation mirror ................593
Cooling system Engine overheating ............... 775
Cruise control
Cruise control ....................... 293
Dynamic radar cruise control .................................298
Cup holders ..............................579
Curtain shield airbags ............. 168
Customizable features............. 815 Daytime running light
system .................................... 270
Defogger
Rear window ......................... 405
Side mirrors........................... 405
Dimension ................................ 784
Dinghy towing .......................... 376
Display Dynamic radar cruise
control ................................. 298
Multi-information display ....... 252
Trip information ..................... 252
Warning messages ............... 744
Do-it-yourself maintenance .... 647
Door courtesy lights Door courtesy lights .............. 566
Wattage................................. 796
Door lock
Back door ................................ 82
Front door ............................... 60
Sliding door ............................. 67
Wireless remote control key ........................................ 53
Doors Back door ................................ 82
Door lock ..................... 53, 60, 68
Front doors.............................. 60
Side mirrors........................... 140
Sliding doors ........................... 67
Driver’s seat belt reminder light ......................................... 733
Driving Break-in tips .......................... 214
Correct posture ..................... 166
Procedures............................ 212
Winter driving tips ................. 352
Driving position memory ........ 120
DVD player........ 499, 509, 513, 514D

847
Alphabetical index
SIENNA_U (OM45477U)
Electric power steering........... 327
Electronic key
If your electronic key
does not operate
properly .............................. 767
Emergency, in case of
If the back door opener is inoperative ........................... 86
If the electronic key
does not operate
properly .............................. 767
If the engine will not start...... 762
If the shift lever cannot be
shifted ................................ 764
If the vehicle has
discharged battery ............. 770
If the warning buzzer sounds... ........................... 729
If the warning light turns on .............................. 729
If the warning message is displayed ............................ 744
If you have a flat tire .... 745, 747
If you lose your keys............. 766
If you think something is wrong ................................. 727
If your vehicle becomes stuck................................... 778
If your vehicle has to be stopped in an emergency ................ 780
If your vehicle needs to be
towed ................................. 723
If your vehicle overheats ...... 775
Emergency flashers ................ 722 Engine
Accessory mode....................231
Compartment ........................655
Engine switch ................226, 229
Hood......................................651
How to start the engine .........................226, 229
Identification number .............785
If the engine will not start ......762
Ignition switch................226, 229
Overheating...........................775
Engine coolant
Capacity ................................790
Checking ...............................662
Preparing and checking before winter .......................352
Engine coolan t temperature
gauge ......................................244
Engine immobilizer system.....159
Engine oil Capacity ................................788
Checking ...............................657
Preparing and checking before winter .......................352
Engine switch ...................226, 229
EPS ............................................327
Event data recorder ...................27E

850 Alphabetical index
SIENNA_U (OM45477U)
MaintenanceDo-it-yourself maintenance ....................... 647
General maintenance ............642
Maintenance data.................. 784
Maintenance requirements....639
Reset the maintenance data .....................................640
Meter
Instrument panel light control .................................245
Meters ...................................244
Mirrors Conversation mirror............... 593
Inside rear view mirror...........138
Side mirror heaters................405
Side mirrors ...........................140
Vanity mirrors ........................591
Moon roof .................................150
MP3 disc ...................................431
Multi-information display ........ 252
Noise from under vehicle .......... 24
Odometer .................................. 244
Oil Engine oil ..............................657
Opener Back door ................................82
Fuel filler door ....................... 155
Hood......................................651
Outer foot lights
Outer foot lights ..................... 566
Replacing light bulbs ............. 709
Wattage .................................796
Outside rear view mirrors Adjusting and folding ............. 140
Driving position memory........ 120
Overhead console .................... 578
Overheating, Engine ................775 Parking assist sensors............ 314
Parking brake ........................... 242
Parking lights
Replacing light bulbs ............. 709
Switch ................................... 266
Wattage................................. 796
PCS ........................................... 336
Personal lights Switch ................................... 567
Wattage................................. 796
Power back door ........................ 82
Power outlets ........................... 594
Power windows ................ 144, 148
Pre-collision system ................ 336
Quarter windows...................... 148
Radar cruise control ................ 298
Radiator .................................... 664
Radio ......................................... 412
Rear automatic air conditioning system ............. 401
Rear ceiling light
Switch ................................... 570
Wattage................................. 796
Rear manual air conditioning
system .................................... 398
Rear seat Adjustment ............................ 100
Folding third seats......... 109, 110
Installing second seats.......... 107
Removing second seats........ 104
Stowing third seats........ 111, 113
Rear seat entertainment system .................................... 488M
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