2013 Lexus GS450h engine overheat

7757-2. Steps to take in an emergency
GS450h_U (OM30D01U)
7
When trouble arises
After the hybrid system has
cooled down sufficiently,
check the engine coolant level
and inspect the cooling sys-
tem for leaks.
If the engine compartment cover
needs to be removed: →P. 6 3 8
Add engine coolant if neces-
sary.
Water can be used in an emer-
gency if engine coolant is unavail-
able. ( →P. 7 8 7 )
Have the vehicle inspected at the nearest Lexus dealer as soon as pos-
sible.
■If “Hybrid System Overheat” is sh own on the multi-information dis-
play
Stop the vehicle in a safe place and turn off the air conditioning sys-
tem.
Leave the hybrid system operating and carefully lift the hood.
Check if the cooling fans are operating.
If the fans are operating:
Wait until the “Hybrid System Overheat” message disappears and
then stop the hybrid system.
If the message does not disappear, call your Lexus dealer.
If the fans are not operating:
Stop the hybrid system immediately and call your Lexus dealer.
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GS450h_U.book Page 775 Monday, January 23, 2012 10:20 AM

7767-2. Steps to take in an emergency
GS450h_U (OM30D01U)After the hybrid system has
cooled down, check the power
control unit coolant level and
inspect the cooling system for
leaks.
If the engine compartment cover
needs to be removed:
→P. 6 3 8
Add power control unit cool-
ant if necessary.
Water can be used in an emer-
gency if power control unit coolant
is unavailable. ( →P. 7 8 7 )
Have the vehicle inspected at the nearest Lexus dealer as soon as pos-
sible.
■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.
●“Hybrid System Overheat” is shown on the multi-information display.
●Steam comes out from under the hood.
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GS450h_U.book Page 776 Monday, January 23, 2012 10:20 AM

843Alphabetical index
GS450h_U (OM30D01U)
Console box ............................................577
Console box light ..................................577
Consumption screen ............................. 113
Coolant..................................................... 642Capacity .................................................787
Checking................................................ 642
Preparing and checking before winter ..................................................... 319
Cooling system ..................................... 642 Engine overheating........................... 774
Hybrid system overheating .......... 774
Cruise control
Cruise control...................................... 232
Dynamic radar crui se control......236
Cup holders ............................................ 578
Curtain shield airbags ........................... 39
Customizable features ....................... 807
Daytime running light system ............216
Defogger Front windshield ...................................371
Outside rear view mirrors ............ 384
Rear window ....................................... 384
Differential............................................... 789
Dimensions ............................................. 782
Dinghy towing......................................... 188 Display
Dynamic radar crui se control ..... 236
LKA (Lane-Keeping Assist)......... 255
Multi-information display.................. 94
Remote Touch screen ....................330
Trip information ..................................... 95
Warning message............................... 721
Do-it-yourself maintenance............... 631
Door courtesy lights Location ................................................... 571
Wattage ................................................... 791
Door lock
Doors......................................................... 137
Smart access system with push-button start ................................ 121
Wireless remote control..................134
Doors .......................................................... 137 Automatic door locking
and unlocking system ....................139
Door glasses ..........................................164
Door lock................................................. 137
Open door warning buzzer .......... 125
Open door warning light ................ 714
Outside rear view mirrors ............... 161
Rear door child-protector ............. 138
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GS450h_U.book Page 843 Monday, January 23, 2012 10:20 AM

845Alphabetical index
GS450h_U (OM30D01U)
Energy monitor ........................................ 110
EngineAccessory mode................................. 190
Compartment ...................................... 637
Engine switch ........................................ 189
Hood ........................................................634
How to start the hybrid system .... 189
Identification number .......................783
Ignition switch (power switch).................................. 189
Overheating ......................................... 774
Power switch......................................... 189
Engine compartment cover .............638
Engine coolant....................................... 642 Capacity .................................................787
Checking................................................ 642
Preparing and checking before winter ..................................... 319
Engine coolant temperature gauge ........................................................ 89
Engine oil ................................................. 639 Capacity ................................................ 785
Checking............................................... 639
Oil level warning message ........... 733
Oil pressure warning message ........................... 722
Preparing and checking before winter ..................................... 319 Engine oil maintenance data ............624
Engine switch...........................................189
EPS
(Electronic Power Steering) ........ 289
Function .................................................. 289
Warning light ......................................... 712
Warning message............................. 726
EV drive mode ........................................ 196
Event data recorder (EDR).....................11
First-aid kit storage net ........................581
Flat tire .......................................................749
Floor mats................................................... 28
Fluid Brake........................................................789
Hybrid transmission .........................788
Washer ................................................... 646
Fog lights.................................................... 218 Replacing light bulbs ...................... 689
Switch ........................................................218
Wattage ................................................... 791
Footwell light............................................ 571
Front passenger occupant classification system ............................49
Front personal lights ............................572
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GS450h_U.book Page 845 Monday, January 23, 2012 10:20 AM

847Alphabetical index
GS450h_U (OM30D01U)
HeatersAir conditioning system ..................364
Heated steering wheel ................... 588
Seat heaters ......................................... 590
Outside rear view mirrors ............ 384
High-voltage components ...................74
Hood .......................................................... 634 Open ........................................................634
Warning message .............................728
Hooks
Cargo hooks ......................................... 581
Coat hooks ...........................................597
Luggage hook ...................................... 581
Retaining hooks (floor mat) .............28
Utility hook ........................................... 599
Horn .............................................................212
Hybrid battery (traction battery) .......74
Hybrid battery (traction battery)
air vents .................................................... 75
Hybrid system ........................................... 70
Emergency shut off system .............. 75
Energy monitor/consumption screen ...................... 109
EV drive mode..................................... 196
High voltage components ............... 74
Hybrid System Indicator ................... 92
Hybrid system precautions .............. 74
Hybrid vehicle driving tips...............317
If the hybrid system will not start........................................ 762
Overheating ......................................... 774
Power (ignition) switch .................... 189
Starting the hybrid system .............. 189
Vehicle proximity notification system ....................................................... 71 Hybrid System Indicator .......................92
Hybrid transmission .............................. 199
If the shift lever cannot be shifted from P ............ 764
Paddle shift switches..........................201
S mode.................................................... 202
I/M test ..................................................... 630
Identification Engine ..................................................... 783
Vehicle .................................................... 783
Ignition switch (power switch) ..........189
Illuminated entry system ....................573
Immobilizer system ................................. 79
Indicators .....................................................87
Initialization Maintenance ........................................ 624
Moon roof ...............................................169
Power windows....................................165
Tire pressure warning system ...............................653
Initiators (tire pressure warning system) ................................ 659
Inside door handle lights ..................... 571
Inside rear view mirror.........................159
Instrument panel light control .............. 91
Interior lights ............................................ 571
Intuitive parking assist .......................... 261 Function .................................................... 261
Warning message..................723, 734
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GS450h_U.book Page 847 Monday, January 23, 2012 10:20 AM

850Alphabetical index
GS450h_U (OM30D01U)
Multi-information display ..................... 94Dynamic radar crui se control......236
Energy monitor ...................................... 110
Lane-Keeping Assist ....................... 255
Language ..................................................98
Switching the display...........................95
Trip information .....................................95
Warning message ............................... 721
Navigation system
*
Noise from under vehicle ....................... 8
Odometer .................................................. 89
Oil Engine oil............................................... 785
Differential oil ...................................... 789
Opener Hood ........................................................634
Trunk ........................................................... 141
Outer foot lights
Outer foot lights .................................. 571
Wattage ....................................................791 Outside rear view mirrors................... 161
Adjusting and folding ......................... 161
Blind spot monitor ............................305
Linked mirror function
when reversing.................................. 162
Mirror position memory ................. 150
Outside rear view mirror defoggers............................ 384
Outside temperature display ............. 95
Overheating............................................ 774
Paddle shift switches.............................201
Parking assist sensors (intuitive parking assist).................... 261
Parking brake .........................................207
If the parking brake cannot be released ....................... 765
Operation.............................................. 207
Parking brake engaged warning buzzer ............................... 730
Parking brake engaged
warning message........................... 730
Parking lights ........................................... 213
Light switch............................................. 213
Replacing light bulbs ....................... 697
Welcome light illumination control............................121
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GS450h_U.book Page 850 Monday, January 23, 2012 10:20 AM