2010 Lexus GS350 engine overheat

401
3-7. Other interior features
3
Interior features
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
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 disabled
• 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 seat heater more than necessary.
Doing so may cause minor burns or overheating.
NOTICE
■To prevent damage to the seat heaters/ventilators
Do not put heavy objects on the seat and do not stick sharp objects (needles, nails,
etc.) into the seat.
■To prevent 12 volt battery discharge
Turn the switches off when the engine is off.

When trouble arises5
519
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
5-1. Essential information
Emergency flashers.............. 520
If your vehicle needs 
to be towed ............................. 521
If you think something is 
wrong ..................................... 530
Fuel pump shut off 
system ...................................... 531
Event data recorder .............. 5325-2. Steps to take in an 
emergency
If a warning light turns 
on or a warning buzzer 
sounds..................................... 534
If a warning message is 
displayed................................ 543
If you have a flat tire (Vehicles 
with standard tires) ............. 556
If you have a flat tire (Vehicles 
with run-flat tires)................ 566
If the engine will not start .... 568
If the shift lever cannot be 
shifted from “P”.................... 569
If you lose your keys .............. 570
If the electronic key does 
not operate properly............ 571
If the 12 volt battery is 
discharged ............................. 574
If your vehicle overheats ..... 578
If the vehicle becomes 
stuck......................................... 581
If your vehicle has to be stopped 
in an emergency .................. 583

578
5-2. Steps to take in an emergency
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
If your vehicle overheats
If your engine overheats:
Stop the vehicle in a safe place and turn off the air conditioning
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 sub-
sides and then restart the engine.
If you do not see steam:
Leave the engine running and carefully lift the hood.
Remove the engine compartment cover. (P. 450)
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 engine immediately and call your Lexus dealer.
After the engine has cooled
down sufficiently, check the
coolant level and inspect the
radiator core (radiator) for any
leaks.STEP1
STEP2
STEP3
STEP4
STEP5

5
When trouble arises
579
5-2. Steps to take in an emergency
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
■Overheating
In the following situations, 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
●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, causing serious
injury such as burns.
●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.
Add coolant if necessary.
Water can be used in an emer-
gency measure if coolant is
unavailable. (P. 5 9 4 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

633
Alphabetical index
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
Back-up lights
Wattage ................................................ 600
Battery
12 volt battery ...................................... 459
Checking ............................................... 459
If the 12 volt battery is 
discharged ........................................ 574
Preparing and checking 
before winter ...................................... 219
Bluetooth
® audio ................................. 308
Bluetooth
® phone ............................... 332
Brake
Fluid .......................................................... 457
Parking brake ........................................ 145
Brake assist ............................................. 200
Care
Exterior ................................................... 430
Interior..................................................... 433
Seat belts ............................................... 434
Cargo capacity ....................................... 214
Cargo hooks .......................................... 408
CD player/changer .............................269
Chains....................................................... 220
Child-protectors ......................................44
Child restraint system
Definition................................................... 110
Installation.................................................. 114
Installing CRS with lower 
anchors ...................................................115
Installing CRS with seatbelts ........... 117
Installing CRS with top straps ......... 121Child safety
Airbag precautions ............................100
Battery precautions ............. 460, 577
Child restraint system ......................... 110
Child-protectors ................................... 44
How your child should wear 
the seatbelt............................................66
Installing child restraints..................... 114
Moon roof precautions....................... 81
Power window lock switch .............. 75
Power window precautions ............ 75
Removed electronic key battery 
precautions....................................... 483
Seat belt comfort guide ..................... 64
Seat belt precautions .......................... 67
Seat heater precautions.................. 401
Trunk precautions................................ 50
Cigarette lighter................................... 398
Cleaning
Exterior................................................... 430
Interior .....................................................433
Seat belts ................................................434
Clock .........................................................395
Coin holder .............................................390
Compass ....................................................417
Condenser .............................................. 457
Console box .......................................... 388
Cooling system
Engine overheating.......................... 578
Cruise control
Cruise control........................................167
Dynamic radar cruise control......... 171
Cup holders ............................................. 391
Curtain shield airbags............................ 93
Customizable features ........................ 618
B
C

634
Alphabetical index
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
Daytime running light system ........... 158
Defogger
Rear window ........................................ 255
Side mirror ............................................ 255
Dimension ............................................... 586
Dinghy towing ........................................ 225
Display
Multi-information display.................154
Touch screen ....................................... 228
Trip information ................................... 155
Warning message............................. 543
Do-it-yourself maintenance ............. 442
Door courtesy lights ............................382
Door pocket............................................ 392
Doors
Door lock...................................29, 41, 43
Rear door child protector ................ 44
Driver’s seat belt reminder light .....536
Driver’s seat position memory ...........55
Driving
Correct posture ...................................... 91
Procedures ............................................. 126
DVD player/changer......................... 280
Electric power steering ..................... 200
Electronic key
If the electronic key does 
not operate properly ...................... 571
Replacing battery .............................. 482Emergency, in case of
If a warning light turns on .............. 534
If a warning message is 
displayed ............................................ 543
If the electronic key does 
not operate properly ..................... 571
If the engine will not 
start .......................................................568
If the shift lever cannot be 
shifted from “P” ............................... 569
If the 12 volt battery is 
discharged ........................................574
If you have a flat tire ........... 556, 566
If you lose your keys ........................ 570
If you think something is 
wrong .................................................. 530
If your vehicle becomes stuck ......581
If your vehicle has to be stopped 
in an emergency ............................ 583
If your vehicle needs to be 
towed ................................................... 520
If your vehicle overheats................ 578
Engine
ACCESSORY mode....................... 136
Compartment ..................................... 448
Engine (ignition) switch.................... 135
Hood ....................................................... 445
How to start the engine ................... 135
If the engine will not start ...............568
Overheating ........................................ 578
Engine compartment cover ............. 450
Engine coolant temperature 
gauge ....................................................... 147D
E

637
Alphabetical index
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
Noise from under the vehicle .............. 18
Odometer ................................................. 147
Oil
Engine oil ................................................. 451
Opener
Fuel filler door ........................................ 82
Hood ....................................................... 445
Trunk........................................................... 48
Outer foot lights ................................... 382
Outside rear view mirrors
Adjusting and folding .......................... 73
Mirror position memory ................... 55
Outside temperature 
display .......................................... 156, 396
Overhead console .............................. 389
Overheating, Engine .......................... 578
Parking brake .......................................... 145
Parking lights
Replacing light bulbs ......................... 512
Switch ........................................................ 157
Wattage ................................................ 600
Personal lights ....................................... 384
Portable music player ........................ 328
Power outlet ........................................... 399
Power windows......................................... 75
Pre-collision system .............................207Radar cruise control ............................... 171
Radiator .................................................... 457
Radio ..........................................................260
Radio data system ................................ 262
Rear sunshade .......................................403
Rear turn signal lights
Replacing light bulbs ......................... 512
Wattage ................................................. 600
Rear view monitor system.................. 196
Rear window defogger ......................255
Replacing
Electronic key battery ......................482
Fuses........................................................ 484
Light bulbs .............................................. 512
Reporting safety defects for 
U.S. owners .......................................... 626
Safety Connect....................................... 421
Seat belts
Adjusting the seat belt ........................ 63
Automatic locking retractor ............66
Child restraint system 
installation .............................................. 114
Cleaning and maintaining 
the seat belts .....................................434
Emergency locking retractor..........66
How to wear your seat belt ............. 63
How your child should wear 
the seat belt ..........................................66
Pre-collision seat belts .......................65
Pregnant women, 
proper seat belt use .........................66
Reminder light .................................... 536
Seat belt extenders .............................. 67
Seat belt pretensioners ......................65N
O
P
R
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642
GS_G_U (OM30C80U)
June 29, 2011 10:30 am
What to do if...
What to do if...
A tire puncturesP. 5 5 6 /
566If you have a flat tire
The engine does not start
P. 8 5Immobilizer system
P. 5 6 8If the engine will not start
P. 5 74If the 12 volt battery is discharged
The shift lever cannot be 
moved outP. 5 6 9If 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. 5 7 8If your vehicle overheats
The key is lostP. 5 7 0If you lose your keys
The 12 volt battery runs outP. 5 74If the 12 volt battery is discharged
The doors cannot be lockedP. 4 3Doors
The horn begins to soundP. 8 7Alarm
The vehicle is stuck in mud or
sandP. 5 8 1If the vehicle becomes stuck