engine overheat TOYOTA PRIUS 2008 2.G Owners Manual

124 2-1. Driving procedures
PRIUS_U_(L/O_0802)
CAUTION
■When driving the vehicle
● Do not under any circumstances shift the shift lever to “R”, “N” or push the
“P” position switch while the vehicle is moving.
Doing so can cause significant damage to the transmission and may result
in a loss of vehicle control.
● Do not shift the shift lever to “N” while the vehicle is moving.
Doing so may cause the engine brake not to operate properly and lead to
an accident.
● Do not turn the hybrid system off while driving.
The power steering and brake actuator will not operate properly if the
hybrid system is not running.
● Use engine braking (“B”) to maintain a safe speed when driving down a
steep hill.
Using the brakes continuously may cause the brakes to overheat and lose
effectiveness. ( P. 136)
● When stopped on an inclined surface, use the brake pedal and parking
brake to prevent the vehicle from rolling backward or forward and causing
an accident.
● Do not adjust the position of the steering wheel, the seat, or the inside or
outside rear view mirrors while driving.
Doing so may result in a loss of vehicle control that can cause accidents
that may result in death or serious injury.
● Always check that all passengers’ arms, heads or other parts of their bod-
ies are not outside the vehicle, as this may result in death or serious injury.
● Do not drive in excess of the speed limit. Even if the legal speed limit per-
mits it, do not drive over 85 mph (140 km/h) unless your vehicle has high
speed capability tires. Driving over 85 mph (140 km/h) may result in tire
failure, loss of control and possible injury. Be sure to consult a tire dealer
to determine whether the tires on your vehicle are high-speed capability
tires or not before driving at such speeds.

456
5-2. Steps to take in an emergency
PRIUS_U_(L/O_0802)
If your vehicle overheats
Correction proceduresStop the vehicle in a safe place and turn off the automatic air
conditioning system.
Check to see if steam is coming out from under the hood.
If you see steam: Stop the engine and carefully lift the hood.
If you do not see steam: Leave the engine running and carefully lift the hood.
Remove the engine compartment cover. ( P. 365)
Check to see if the cooling fan is operating.
If the fan is operating: Wait until the engine coolant temperature gauge begins to
fall and then stop the engine.
If the fan is not operating: Stop the hybrid system immediately and call your local Toy-
ota dealer.
After the hybrid system has
cooled down sufficiently, check
the coolant level and inspect the
radiator core (radiator) for any
leaks.
The following may indicate that your vehicle is overheating:
The high engine coolant temperature warning light comes on:
The engine may be overheating.
Follow the correction procedure as described blow.
STEP1
STEP2
STEP3
STEP4
ITY52P018
STEP5

5
When trouble arises
457
5-2. Steps to take in an emergency
PRIUS_U_(L/O_0802)
Add coolant if required.
Water can be used in an emer-
gency measure if coolant is
unavailable. (
P. 467)
Have the vehicle checked at your nearest Toyota dealer as soon as
possible.
ITY52P019
STEP6
■Overheating
In the following situations, your vehicle may be overheating.
● High coolant temperature warning light is displayed on the touch screen.
● Steam is coming from under the hood.
CAUTION
■To prevent an accident or injury when inspecting under the hood of
your vehicle
● Keep hands and clothing away from the fan and engine drive belt while the
engine is running.
● Do not loosen the radiator cap while the engine and radiator are hot.
Serious injury, such as burns, may result from hot coolant and steam
released under pressure.

501
Alphabetical index
PRIUS_U_(L/O_0802)
Child safety
Airbag precautions ................. 96
Child restraint system ........... 107
Child-protectors ...................... 52
How your child should wear the seatbelt .......................... 67
Installing child restraints ....... 110
Power window lock switch ...... 75
Power window precautions..... 77
Removed electronic key battery precautions ........................ 397
Seat belt precautions.............. 68
Back door ............................... 56
Cleaning Exterior ................................. 346
Interior .................................. 348
Seat belts ............................. 349
Clock ........................................ 331
Condenser ............................... 373
Console box............................. 323
Cooling system Hybrid system overheating ... 456
Cruise control Cruise control ....................... 164
Cup holders ............................. 325
Curtain shield airbags .............. 89
Customizable features ............ 488
Daytime running light system ................................... 151
Defogger Rear window......................... 217
Side mirror ............................ 217
Dimension ................................ 462
Dinghy towing ......................... 182
Display Touch screen........................ 186
Trip information ...................... 27
Do-it-yourself maintenance .... 357
Door courtesy lights ............... 318
Door pocket ............................. 326 Doors
Door lock .....................36, 49, 51
Rear door child protector.........52
Driver’s seat belt reminder light .........................................429
Driving
break-in tips...........................121
Correct posture .......................87
Procedures ............................120
Winter driving tips..................177
Electronic key Replacing battery ..................396
When the electronic key battery is discharged.......................450
Electric Power Steering ...........170
Emergency, in case of
If a warning light turns on ......426
If the electronic key does not operate properly..................450
If the hybrid system will not
start .....................................448
If the 12 volt battery is discharged .........................451
If you have a flat tire .............438
If you lose your keys .............449
If you think something is wrong ..................................423
If your vehicle becomes stuck ...................................459
If your vehicle needs to be towed ..................................416
If your vehicle overheats .......456
Engine Compartment ........................364
Hood......................................361
How to start the hybrid system ................................130
If the hybrid system will
not start ...............................448
Overheating...........................456
“POWER” switch ...................130
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Alphabetical index
PRIUS_U_(L/O_0802)
Interior lights
Interior lights ......................... 320
Switch ................................... 320
Wattage ................................ 471
Jack Positioning the jack .............. 362
Replacing the wheel ............. 438
Jack handle.............................. 438
Keys Electronic key ......................... 49
If you lose your keys............. 449
If your electronic key ............ 450
Key number plate ................... 35
Keyless entry .......................... 36
Keys ....................................... 34
“POWER” switch .................. 130
Mechanical key....................... 34
Wireless remote control.......... 49
Light bulbs Replacing ............................. 407
Wattage ................................ 471
Lights
Fog light switch..................... 156
Headlights switch ................. 150
Interior lights list ................... 318
Replacing light bulbs ............ 407
Turn signal lever ................... 140
Vanity lights .......................... 330
Wattage ................................ 471
Load capacity .......................... 176
Maintenance Do-it-yourself
maintenance ...................... 357
General maintenance ........... 353
Maintenance data ................. 462
Maintenance requirements ...................... 351 Meter
Instrument panel light control .................................144
Meters ...................................143
Mirrors Inside rear view mirror.............71
Side mirror heater .................217
Side mirrors .............................73
Vanity mirrors ........................330
MP3 disc ...................................254
Odometer ..................................143
Oil Engine oil ..............................365
Opener Fuel filler door .........................78
Hood......................................361
Back door ................................54
Outside rear view mirrors Adjusting and folding ...............73
Outside temperature
display ....................................189
Overheating, Hybrid system ....................................456
Parking brake ...........................142
Parking lights Replacing light bulbs .............407
Switch....................................150
Wattage .................................471
Personal lights .........................320
Power meter .............................143
Power outlet .............................332
Power windows ..........................75
Radiator ....................................373
Radio .........................................225
RDS (Radio Data System) .......227
Rear turn signal lights Replacing light bulbs .............407
Wattage .................................471
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PRIUS_U_(L/O_0802)
What to do if...
What to do if...
A tire puncturesP. 438If you have a flat tire
The engine does not start
P. 8 1Hybrid system immobilizer system
P. 448If the engine will not start
P. 451If the 12 volt battery is discharged
The high coolant temperature
warning light comes on.
Steam can be seen coming
from under the hood
P. 456If your vehicle overheats
The key is lostP. 449If you lose your keys
The 12 volt battery runs outP. 451If the 12 volt battery is discharged
The doors cannot be lockedP. 5 1Doors
The horn begins to soundP. 8 4Alarm
The vehicle is stuck in mud or
sandP. 459If the vehicle becomes stuck
The warning light or indicator
light comes onP. 426If the warning light turns on