2015 Lexus GS350 engine overheat

GS350_OM_OM30F69U_(U)
2534-5. Using the driving support systems
4
Driving
■Reactivation of the TRAC system linked to vehicle speed
When only the TRAC system is turned off, the TRAC system will turn on when vehi-
cle speed increases. However, when both TRAC/VSC systems are turned off, the
systems will not turn on even when vehicle speed increases.
■Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from overheat-
ing when there is frequent steering input ov er an extended period of time. The steer-
ing wheel may feel heavy as a result.
* Should this occur, refrain from excessive
steering input or stop the vehicle and tu rn the engine off. The EPS system should
return to normal within 10 minutes.
*: If the LKA (Lane-Keeping Assist) system cannot operate in this case, a warning
message will be shown on the multi-information display.

457
GS350_OM_OM30F69U_(U)
When trouble arises7
7-1. Essential information Emergency flashers .................. 458
If your vehicle has to be stopped in an emergency .... 459
7-2. Steps to take in an emergency If your vehicle needs to be towed ................................460
If you think something is wrong ................ 466
Fuel pump shut off system ...... 467
If a warning light turns on or a warning buzzer sounds .....468
If a warning message is displayed ................................ 478
If you have a flat tire...................502
If the engine will not start ......... 515
If the shift lever cannot be shifted from P .......................517
If the parking brake cannot be released ................................. 518
If the electronic key does not operate properly ..................... 520
If the vehicle battery is discharged ............................. 523
If your vehicle overheats ......... 527
If the vehicle becomes stuck .............................................530

527
GS350_OM_OM30F69U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If your vehicle overheats
Stop the vehicle in a safe place and turn off the air conditioning 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 (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The following may indicate that your vehicle is overheating.
●The needle of the engine coolant temperature gauge ( P. 81) enters
the red zone or a loss of engine power is expe rienced. (For example,
the vehicle speed does not increase.)
●Steam is coming from under the hood.
Correction procedures
1
2
3
1
2

596Alphabetical index
GS350_OM_OM30F69U_(U)
Care ................................................ 374, 378Aluminum wheels ..............................375
Exterior.................................................... 374
Interior .....................................................378
Seat belts ................................................379
Cargo capacity........................................ 174
Cargo hooks .......................................... 337
CD player
*
Chains ....................................................... 285
Child restraint system............................ 55 Booster seats, definition ....................55
Booster seats, installation..................65
Convertible seats, definition ............55
Convertible seats, installation ......... 62
Front passenger occupant classification system ......................... 47
Infant seats, definition ..........................55
Infant seats, installation ....................... 62
Installing CRS with LATCH anchors .....................60
Installing CRS with seat belts .......... 62
Installing CRS with top tether strap .........................66
Child safety ................................................ 54 Airbag precautions .............................. 39
Battery precautions ............. 405, 526
Child restraint system .........................55
How your child should wear the seat belt ................................... 31, 32
Installing child restraints.....................59
Moon roof precautions.................... 158
Power window lock switch .............. 151 Power window precautions ...........154
Rear door child-protectors ............ 124
Removed electronic
key battery precautions .............. 426
Seat belt comfort guide ....................... 31
Seat belt extender precautions .......................................... 35
Seat belt precautions .......................... 58
Seat heater precautions ................. 349
Trunk precautions .............................. 130
Child-protectors .................................... 124
Cleaning ....................................... 374, 378 Aluminum wheels .............................. 375
Exterior ................................................... 374
Interior ..................................................... 378
Seat belts................................................ 379
Clock........................................................... 341
Coat hooks ............................................. 356
Condenser.............................................. 402
Console box ........................................... 333
Console box light ................................. 333
Cooling system Engine overheating .......................... 527
Cruise control Cruise control ....................................... 214
Dynamic radar cruise control .......218
Cup holders............................................ 334
Curtain shield airbags ............................ 37
Customizable features ...................... 559
C

598Alphabetical index
GS350_OM_OM30F69U_(U)
Emergency, in case ofIf a warning buzzer sounds................................................. 468
If a warning light turns on.............. 468
If a warning message is displayed ........................................478
If the electronic key does not operate properly ....... 520
If the engine will not start................. 515
If the parking brake cannot be released ......................... 518
If the shift lever cannot be shifted from P ............. 517
If the vehicle battery is discharged .........................................523
If you have a flat tire ......................... 502
If you think something is wrong.............................................. 466
If your vehicle becomes stuck ..................................................... 530
If your vehicle has to be stopped in an emergency ......... 459
If your vehicle needs to be towed ...................................... 460
If your vehicle overheats ................ 527
Emergency flashers ............................. 458
Engine Accessory mode................................. 178
Compartment..................................... 395
Engine switch ......................................... 177
Hood ........................................................392
How to start the engine .................... 177
Identification number ...................... 535
If the engine will not start................. 515
Ignition switch (engine switch) .................................. 177
Overheating ......................................... 527 Engine compartment cover............. 396
Engine coolant ...................................... 400
Capacity.................................................538
Checking .............................................. 400
Preparing and checking before winter .................................... 283
Engine coolant temperature gauge .......................................................... 81
Engine immobilizer system ..................70
Engine oil ..................................................397 Capacity.................................................536
Checking ............................................... 397
Oil level warning message ........... 487
Oil pressure warning message........................... 479
Preparing and checking before winter .................................... 283
Engine oil maintenance data ........... 382
Engine switch ........................................... 177
Enhanced VSC ..................................... 248
EPS (Electric Power Steering) ..............249 Function .................................................. 249
Warning light ....................................... 469
Warning message.............................483
Event data recorder (EDR)................... 10

602Alphabetical index
GS350_OM_OM30F69U_(U)
Main display............................................ 296
MaintenanceDo-it-yourself maintenance......... 389
General maintenance .................... 384
Maintenance data ..............................534
Maintenance requirements............ 381
Malfunction indicator lamp .............. 469
Master warning light ............................. 471
Meter ..............................................................81 Head-up display.................................... 92
Indicators................................................... 79
Instrument panel light control ......... 82
Meters.......................................................... 81
Multi-information display ..................84
Warning lights ........................................ 77
Micro dust and pollen filter ................313
Mirrors Inside rear view mirror ..................... 146
Outside rear view mirror defoggers ........................................... 324
Outside rear view mirrors .............. 148
Vanity mirrors ..................................... 340
Moon roof................................................. 155 Door lock linked moon roof operation ..................... 156
Jam protection function ................... 156
Operation ............................................... 155
Warning message ............................ 486
MP3 disc
*
Multi-information display..................... 84 Dynamic radar cruise control .......218
Lane-Keeping Assist ........................237
Language..................................................88
Switching the display .......................... 85
Trip information ..................................... 85
Warning message............................. 478
Navigation system
*
Noise from under vehicle ........................8
Odometer .................................................... 81
Oil Engine oil ...............................................536
Front differential oil ...........................540
Rear differential oil ............................540
Opener Hood........................................................ 392
Trunk .......................................................... 127
Outer foot lights Outer foot lights ..................................327
Replacing light bulbs ....................... 453
Wattage ................................................. 543
Outside rear view mirrors ..................148 Adjusting and folding ........................148
Blind spot monitor ............................ 267
Linked mirror function when reversing..................................149
Mirror position memory ..................136
Outside rear view mirror defoggers............................ 324
Outside temperature display ............. 85
Overheating, Engine ...........................527
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