engine overheat Lexus GX460 2013 Specifications /

337
2-4. Using other driving systems
2
When driving
GX460_OM_OM60J63U_(U)
■Operating tips
The system will operate when the shift lever is in a position other than P, however to
make effective use of the system it is recommended that the shift lever be shifted to
2 or 1 range of S mode.
■If the four-wheel drive control switch is in H4
The system does not operate.
■When the downhill assist control system is operated continuously
This may cause the brake actuator to overheat. In this case, the downhill assist con-
trol system will stop operating, a buzzer will sound and the DAC indicator will start
flashing, and the TRAC OFF will be shown on the multi-information display. Refrain
from using the system until the DAC indicator stays on and the message goes off.
(The vehicle can be driven normally during this time.)
■Sounds and vibrations caused by the DAC
●A sound may be heard from the engi ne compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate that
a malfunction has occurred in DAC.
●Either of the following conditions may occur when the DAC is operating. None
of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■System malfunction
●The DAC indicator does not come on when the “ENGINE START STOP”
switch is turned to IGNITION ON mode.
●The “DAC” indicator does not come on when the “DAC” switch is pressed.
●The slip indicator comes on.
In the above cases, have your vehicle checked by your Lexus dealer.

387
2-5. Driving information
2
When driving
GX460_OM_OM60J63U_(U)●
Avoid jerky starts or sudden acceleration.
● Avoid jerky steering and sharp turns, and slow down before making a
turn.
● Note that when making a turn, the tr ailer wheels will be closer than the
vehicle wheels to the inside of th e turn. Compensate by making a
wider than normal turning radius.
● Slow down before making a turn, in crosswinds, on wet or slippery sur-
faces, etc.
Increasing vehicle speed can destabilize the trailer.
● Take care when passing other vehi cles. Passing requires considerable
distance. After passing a vehicle, do not forget the length of your
trailer, and be sure you have 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 5 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 downhill
grades.
● Avoid holding the brake pedal down too long or applying the brakes
too frequently. This could cause th e 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 temperatures over 85°F [30°C]) when driving up a
long or steep grade. If the eng ine coolant temperature gauge indicates
overheating, immediately turn off th e air conditioning (if in use), pull
your vehicle off the road and stop in a safe spot. ( P. 74 9 )

559
3-7. Other interior features
3
Interior features
GX460_OM_OM60J63U_(U)
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 challenged
• 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 damage to the se at heaters and ventilators
Do not put heavy objects that have an unev en surface on the seat and do not stick
sharp objects (needles, nail s, etc.) into the seat.
■To prevent battery discharge
Turn the seat heaters and ventilators off when the engine is not running.

When trouble arises5
683
GX460_OM_OM60J63U_(U)
5-1. Essential informationEmergency flashers............... 684
If your vehicle needs to be towed ............................ 685
If you think something is wrong ....................................... 691
Fuel pump shut off system.... 692 5-2. Steps to take in an
emergency
If a warning light turns on or a warning buzzer
sounds..................................... 693
If a warning message is displayed................................ 705
If you have a flat tire................ 726
If the engine will not start ..... 740
If the shift lever cannot be shifted from P ........................ 742
If you lose your keys ............... 743
If the electronic key does not operate properly........... 744
If the vehicle battery is discharged ............................. 746
If your vehicle overheats ...... 749
If the vehicle becomes stuck........................................ 752
If your vehicle has to be stopped in an
emergency ............................ 754

5
When trouble arises
749
5-2. Steps to take in an emergency
GX460_OM_OM60J63U_(U)
If your vehicle overheats
If the 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. 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.
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 and call your local Lexus dealer.STEP1
STEP2
STEP3

5
When trouble arises
751
5-2. Steps to take in an emergency
GX460_OM_OM60J63U_(U)
■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 in specting 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 compartm ent 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 resu lt from hot coolant and steam released
under pressure.
NOTICE
■When adding engine coolant
Wait until the engine has cooled down before adding coolant.
When adding coolant, do so slowly. Adding cold coolant to a hot engine too quickly
can cause damage to the engine.

828
Alphabetical index
GX460_OM_OM60J63U_(U)
Child-protectors ...................................... 53
CleaningExterior ...................................................596
Interior ...................................................... 601
Seat belts................................................602
Clock
*......................................................546
Coat hooks ............................................... 561
Coin holder .............................................534
Compass ..................................................582
Condenser .............................................. 626
Console box ...........................................532
Conversation mirror ........................... 547
Cool box.................................................... 541
Cooling system Engine overheating .......................... 749
Cornering assist sensors ................... 270
Crawl Control........................................332
Cruise control Cruise control .....................................250
Dynamic radar cruise control ..... 254
Cup holders ............................................536
Curtain shield airbags.......................... 126
Customizable features .......................788
Daytime running light system ..........228
DAC...........................................................336
Defogger Rear window .......................................... 417
Side mirror .............................................. 417
Dimension ................................................758
Dinghy towing ........................................394 Display
Dynamic radar cruise control ..... 254
Multi-information display........................................208, 216
Trip information........................208, 216
Warning message ............................ 705
Do-it-yourself maintenance ...............612
Door courtesy lights Door courtesy lights ........................ 525
Wattage ................................................. 769
Door pocket ........................................... 535
Doors Back door ................................................. 57
Power windows ...................................105
Door lock ......................................... 49, 52
Rear door child protector.................53
Side doors.................................................52
Side mirrors..............................................101
Downhill assist control system ........ 336
Driver’s seat belt reminder light ..... 697
Driving Correct posture................................... 124
Off-road precautions...................... 358
Procedures..............................................172
Winter driving tips .............................. 371
Driving position memory...................... 82
D

829
Alphabetical index
GX460_OM_OM60J63U_(U)
Electronic keyIf the electronic key does not operate properly .............................744
Emergency, in case of If the electronic key does not operate properly .............................744
If the engine will not start ............... 740
If the shift lever cannot be shifted from P .................................... 742
If the vehicle has discharged battery.................................................. 746
If the warning buzzer sounds...... 693
If the warning light turns on .......... 693
If the warning message is displayed ............................................ 705
If you have a flat tire .........................726
If you lose your keys .........................743
If you think something is wrong.....................................................691
If your vehicle becomes stuck .....752
If your vehicle has to be stopped in an emergency ......... 754
If your vehicle needs to be towed ...................................................685
If your vehicle overheats................ 749
Emergency flashers Switch ...................................................... 684 Engine
Accessory mode................................. 183
Compartment....................................... 618
Engine switch ........................................ 183
Hood ..........................................................617
How to start the engine ................... 183
Identification number .......................759
If the engine will not start................740
Ignition switch ....................................... 183
Overheating ......................................... 749
Engine compartment cover .............. 619
Engine coolant Capacity ................................................. 763
Checking ...............................................624
Preparing and checking before winter ......................................371
Engine coolant temperature gauge....................................................... 199
Engine immobilizer system.................. 119
Engine oil Capacity ...................................................761
Checking .............................................. 620
Preparing and checking before winter ......................................371
Engine switch .......................................... 183
Engine switch light................................525
Event data recorder (EDR) ................. 23E
*: For vehicles with a navigation system, refer to the “Navigation System Owner’s Manual”.

832
Alphabetical index
GX460_OM_OM60J63U_(U)
LightsDoor courtesy lights......................... 525
Emergency flasher switch .............684
Engine switch light ............................ 525
Fog light switch ................................... 237
Hazard light switch ...........................684
Headlights switch .............................. 223
Inside door handle light.................. 525
Interior lights list.................................. 525
Personal/interior lights ................... 527
Replacing light bulbs........................ 670
Running board lights........................ 525
Scuff lights.............................................. 525
Shift lever light ..................................... 525
Turn signal lever ...................................196
Vanity lights ..........................................545
Wattage.................................................. 769
Load capacity .........................................369
Luggage cover....................................... 567
Maintenance Do-it-yourself maintenance ........... 612
General maintenance ..................... 607
Maintenance data..............................758
Maintenance requirements ..........604
Reset the maintenance data........ 605
Meter Instrument cluster light control..................................................200
Meters .......................................................199
Micro dust and pollen filter............... 407
Mirrors Inside rear view mirror....................... 99
Side mirror heater ............................... 417
Side mirrors ............................................. 101
Vanity mirrors......................................545 Moon roof................................................. 108
MP3 disc.................................................. 437
Multi-information display
Brightness control .............................. 219
Multi-information display ........ 208, 216
Multi Terrain ABS ................................ 339
Multi-terrain Monitor .........................308
Multi-terrain Select..............................300
Navigation system
*
Noise from under vehicle .................... 20
Odometer .................................................199
Off-road precautions .........................358
Oil Engine oil............................................... 620
Opener Fuel filler door ......................................... 113
Hood ......................................................... 617
Outside rear view mirrors Adjusting and folding ..........................101
Driving position memory ..................82
Outside temperature display .......................................... 209, 216
Overhead console ............................... 539
Overheating, Engine .......................... 749
Parking assist sensors......................... 270
Parking brake........................................... 197
Parking lights Replacing light bulbs ....................... 675
Switch ....................................................... 223
Wattage ................................................. 769
PCS ............................................................ 347
M
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838
GX460_OM_OM60J63U_(U)
What to do if...
What to do if...
A tire puncturesP. 7 2 6If you have a flat tire
The engine does not start
P. 1 1 9Engine immobilizer system
P. 74 0If the engine will not start
P. 74 6If the vehicle battery is discharged
The shift lever cannot be
moved outP. 74 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. 74 9If your vehicle overheats
The key is lostP. 74 3If you lose your keys
The battery is dischargedP. 74 6If the vehicle battery is discharged
The doors cannot be lockedP. 5 2Side doors
P. 5 7Back door
The horn begins to soundP. 1 2 1Alarm
The vehicle is stuck in mud or
sandP. 7 5 2If the vehicle becomes stuck