engine overheat Lexus IS250 2008 User Guide

400
5-2. Steps to take in an emergency
08_IS350/250_U_(L/O_0708)
If your vehicle overheats
If your engine overheats:
Stop 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. 2 9 4 )
Check to see if the cooling fan is operating.
If the fan is operating: Wait until the temperature of the engine (shown on the
instrument cluster) begins to fall and then stop the engine.
If the fan is not operating: Stop the engine immediately and call your local Lexus
dealer.
After the engine has cooled
down sufficiently, check the
engine coolant level and inspect
the radiator core (radiator) for
any leaks.STEP1
STEP2
STEP3
STEP4
STEP5

5
When trouble arises
401
5-2. Steps to take in an emergency
08_IS350/250_U_(L/O_0708)
■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 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 other belts 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.
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.
Add engine coolant if required.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. (
→P. 411)
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

449
Alphabetical index
08_IS350/250_U_(L/O_0708)
Bottle holders .......................................... 241
BrakeFluid ............................................................301
Parking brake ........................................ 129
Brake assist ............................................... 170
Care Exterior ....................................................274
Interior...................................................... 277
Seat belts ............................................... 278
Cargo capacity ....................................... 179
Cargo hooks ............................................ 261
CD changer ...............................................211
CD player....................................................211
Chains.........................................................183
Child restraint system Booster seats, definition.................... 95
Booster seats, installation ................. 99
Convertible seats, definition ........... 95
Convertible seats, installation ........ 99
Front passenger occupant classification system ........................ 90
Infant seats, definition ......................... 95
Infant seats, installation....................... 99
Installing CRS with lower anchorages ......................................... 102
Installing CRS with seatbelts .......... 99
Installing CRS with top straps .......103 Child safety
Airbag precautions ............................. 85
Battery precautions ............. 304, 399
Child restraint system .........................95
Child-protectors ...................................38
How your child should wear
the seatbelt............................................55
Installing child restraints.....................98
Moon roof precautions......................68
Power window lock switch .............. 64
Power window precautions ............65
Removed electronic key battery
precautions........................................326
Seat belt comfort guide ..................... 53
Seat belt extender precautions...... 57
Seat belt precautions ..........................56
Seat heater precautions......252, 254
Trunk precautions................................. 43
Child-protectors ......................................38
Cigarette lighter.................................... 249
Cleaning Exterior.................................................... 274
Interior ..................................................... 277
Seat belts ................................................278
Clock ......................................................... 244
Coat hooks ..............................................259
Compass .................................................. 269
Condenser ............................................... 301
Console box ........................................... 237
Cooling system Engine overheating.......................... 400
Cornering assist sensors .................... 164
Cruise control Cruise control....................................... 152
Dynamic radar cruise control....... 155
C

450
Alphabetical index
08_IS350/250_U_(L/O_0708)
Cup holder .............................................. 239
Curtain shield airbags............................ 79
Customizable features .......................436
Daytime running light system ........... 144
DefoggerRear window........................................200
Side mirror ............................................200
Dimension ................................................406
Dinghy towing .............................. 188, 189
Display Dynamic radar crui se control ...... 155
Satellite switch mode ....................... 245
Trip information ................................... 140
Warning message............................. 369
Do-it-yourself maintenance .............286
Door courtesy lights Door courtesy lights........................... 231
Wattage.................................................. 420
Door pockets........................................... 241
Doors Door glasses ........................................... 64
Door lock................................. 22, 34, 37
Side mirrors ............................................... 61
Driver's seat belt reminder light ..... 362
Driving Correct posture ..................................... 77
Procedures ............................................ 108
Driving position memory ...................... 46 Electric power steering........................170
Electronic key
If the electronic key does not operate properly............................ 394
Emergency, in case of If the engine will not start ................. 391
If the shift lever cannot be shifted from P....................................392
If the vehicle has discharged battery ..................................................397
If the warning buzzer sounds...... 360
If the warning light turns on.......... 360
If the warning message is displayed ............................................ 369
If you have a flat tire ........................ 382
If you lose your keys ........................ 393
If you think something is wrong .................................................. 356
If the electronic key does not operate properly............................ 394
If your vehicle becomes stuck .... 402
If your vehicle needs to be towed ................................................... 350
If your vehicle overheats................400
Engine Compartment ......................................292
Engine switch .......................................... 117
Hood ....................................................... 289
How to start the engine ..................... 117
Identification number ...................... 407
If the engine will not start ................. 391
Ignition switch ......................................... 117
Overheating ........................................400
Engine compartment cover ............. 294
D
E

453
Alphabetical index
08_IS350/250_U_(L/O_0708)
MaintenanceDo-it-yourself maintenance ......... 286
General maintenance ..................... 282
Maintenance data .............................406
Maintenance requirements ..........280
Manual transmission............................. 126
Meter Instrument panel light control .........131
Meters .......................................................130
Micro dust and pollen filter ................ 196
Mirrors Inside rear view mirror ...................... 60
Side mirror heater .............................200
Side mirrors............................................... 61
Vanity mirrors ..................................... 243
Moon roof ...................................................66
MP3 disc ................................................... 217
Multi-information display.................... 139
Odometer .................................................130
Oil Engine oil ............................................... 295
Opener Fuel filler door ........................................ 69
Hood ....................................................... 289
Trunk ............................................................. 41
Outer foot lights Outer foot lights................................... 231
Wattage ................................................. 420
Outside rear view mirrors
Adjusting and folding ........................... 61
Mirror position memory ....................46
Outside temperature display............140
Overhead console .............................. 238 Overhead courtesy lights
Overhead courtesy lights ................231
Wattage ..................................................420
Overheating, Engine.......................... 400
Parking assist sensors .......................... 164
Parking brake .......................................... 129
Parking lights
Replacing light bulbs ........................ 342
Switch........................................................ 143
Wattage ..................................................420
PCS ..............................................................176
Personal lights Switch....................................................... 234
Power outlet............................................250
Power windows ........................................ 64
Pre-collision system...............................176
Radar cruise control............................. 155
Radiator ..................................................... 301
Radio .......................................................... 204
RDS ............................................................205
Rear sunshade ....................................... 256
Rear turn signal lights Replacing light bulbs ........................ 342
Wattage ..................................................420
Rear view mirror Compass................................................269
Rear window defogger ..................... 200
Replacing Electronic key battery ......................325
Fuses......................................................... 327
Light bulbs ............................................. 342
Reporting safety defects for
U.S. owners .......................................... 444M
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458
08_IS350/250_U_(L/O_0708)
What to do if...
What to do if...
A tire puncturesP. 3 8 2If you have a flat tire
The engine does not start
P. 3 9 1If the engine will not start
P. 7 2Engine immobilizer system
P. 3 9 4If the vehicle battery is discharged
The shift lever cannot be
moved outP. 3 9 2If the shift lever cannot be shifted
from P
The engine coolant temperature
gauge enters the red zone
Steam can be seen coming
from under the hood
P. 4 0 0If your vehicle overheats
The key is lostP. 3 9 3If you lose your keys
The battery runs outP. 3 9 7If the vehicle battery is discharged
The doors cannot be lockedP. 3 7Doors
The horn begins to soundP. 74Alarm
The vehicle is stuck in mud or
sandP. 4 0 2If the vehicle becomes stuck