2017 Lexus GS450h coolant

5387-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)
The coolant level is satisfactory if it is between the “FULL”/“F” and “LOW”/
“L” lines on the reservoir.
Reservoir
“FULL”/“F”
“LOW”/“L”
Add coolant if necessary.
Water can be used in an emergency if po wer control unit coolant is unavailable.
Start the hybrid system and check for the multi-information display.
If the message does not disappear: Stop the hybrid system and contact any authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.
If the message is not displayed: Have the vehicle inspected at the nearest any authorized Lexus retailer or Lexus
authorized repairer, or any reliable repairer.
4
1
2
3
GS450hGS300h
5
GS450hGS300h
6

5397-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F92E_(EE)
■When adding coolant
Add coolant in accordance with the following procedure.
Remove caps A and B.
Add coolant through the inlet of cap A up to the “[GR-HV] B” line/“[AR/GR] B” line,
and then install cap A.
Add coolant through the inlet of cap B un til it is full, and then install cap B.
GS300h only: When inst alling cap B, apply coolant to the O-ring on the end of cap B.
Cap A
Cap B
GS450h: “[GR-HV] B” line (Target fill line) GS300h: “[AR/GR] B” line (Target fill line)
1
2
3
GS300h GS450h
1
2
3

5407-2. Steps to take in an emergency
GS450h_300h_OM_OM30F92E_(EE)
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions. Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the h ood, do not open the hood until the steam has subsided. The engine compartment may be very hot.
●After the hybrid system has been turned off, check that the indicator on the power
switch and the “READY” indicator are off. When the hybrid system is operating, the gasoline engine may automatically start, orthe cooling fan may suddenly operate even if the gasoline engine stops. Do not touch
or approach rotating parts such as the fan, which may lead to fingers or clothing (especially a tie, a scarf or a muffler) getting caught, resulting in serious injury.
●Do not loosen the coolant inlet cap or thecoolant reservoir caps while the hybrid sys-tem and radiator are hot.
High temperature steam or coolant could spray out.
GS450h
GS300h

5417-2. Steps to take in an emergency
7
When trouble arises
GS450h_300h_OM_OM30F92E_(EE)
NOTICE
■When adding engine/power control unit coolant
Add coolant slowly after the hybrid system has cooled down sufficiently. Adding cool coolant to a hot hybrid system too quickly can cause damage to the hybrid system.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
●Do not use any coolant additive.

5528-1. Specifications
GS450h_300h_OM_OM30F92E_(EE)
Cooling system
Gasoline engine
Power control unit
Left-hand drive
vehicles
Right-hand drive
vehicles
Capacity
GS450h9.2 L (9.7qt., 8.1 Imp.qt.)2.1 L (2.2qt., 1.8 Imp.qt.)1.9 L (2.0qt., 1.7 Imp.qt.)
GS300h8.1 L (8.6 qt., 7.1 Imp.qt.)1.6 L (1.7 qt., 1.4 Imp.qt.)1.8 L (1.9 qt., 1.6 Imp.qt.)
Coolant typeUse either of the following:
• “Toyota Super Long Life Coolant” • Similar high-quality ethylene glycol-based non-sili-cate, non-amine, non-nitrite, and non-borate cool-
ant with long-life hybrid organic acid technology Do not use plain water alone.
Ignition system
Spark plug
MakeGapDENSO FK20HBR80.8 mm (0.031 in.)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

584Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Cargo hooks........................................... 374
CD player*
Chains ....................................................... 336
Child restraint system ............................ 57
Baby seats, definition ..........................58
Baby seats, installation ....................... 67
Child seats, definition..........................58
Child seats, installation....................... 67
Installing CRS with ISOFIX
rigid anchors........................................ 70
Installing CRS with seat belts.......... 67
Installing CRS with top strap ............ 71
Junior seats, definition ........................58
Junior seats, installation ..................... 69
Child safety................................................. 56
12-volt battery
precautions............................. 414, 534
Airbag precautions .............................. 45
Child restraint system......................... 57
How your child should
wear the seat belt ..................... 39, 40
Installing child restraints .................... 66
Moon roof precautions ................... 198
Power window lock switch.............193
Power window precautions .......... 195
Rear door child-protectors ............143
Removed electronic key
battery precautions ....................... 436
Seat belt comfort guide ..................... 39
Seat belt precautions .......................... 42
Seat heater precautions ...................361
Trunk precautions ..............................149
Child-protectors ................................... 143
Cleaning....................................... 390, 394
Aluminum wheels................................ 391
Exterior ................................................... 390
Interior..................................................... 394
Seat belts ............................................... 395
Clock ............................................... 105, 378
Coat hooks.............................................. 382
Condenser ................................................ 411
Console box ........................................... 370
Console box light ................................... 371
Coolant..................................................... 409
Capacity................................................. 552
Checking ............................................... 409
Preparing and checking
before winter.................................... 334
Cooling system ..................................... 409
Engine overheating .......................... 535
Hybrid system overheating.......... 535
Consumption screen ........................... 126
Cruise control
Cruise control .....................................308
Dynamic radar cruise control
with full-speed range ................... 296
Cup holders .............................................. 371
Curtain shield airbags .......................... 43
Customizable features.........................561

586Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Dynamic radar cruise control
with full-speed range ....................... 296
Function .................................................. 296
Warning message.............................466
Dynamic Rear Steering (DRS)........ 325
Function .................................................. 325
Warning message.............................466
DVD player*
Eco drive mode ........................................ 311
Electric motor (traction motor) ......... 76
Electric Power Steering (EPS)........ 325
Function .................................................. 325
Warning light .........................................461
Warning message.............................466
Electronic key.......................................... 134
Battery-saving function.................... 155
If the electronic key does not
operate properly ............................ 527
Replacing the battery.......................435
Emergency, in case of
If a warning buzzer sounds ......... 460
If a warning light turns on.............. 460
If a warning message is
displayed ............................................466
If the 12-volt battery is
discharged........................................ 530
If the electronic key does not
operate properly ............................ 527
If the hybrid system will not
start ........................................................ 523
If the parking brake cannot
be released........................................525
If you have a flat tire .............498, 509
If you think something
is wrong .............................................. 459
If your vehicle becomes
stuck ..................................................... 542
If your vehicle has to be
stopped in an emergency ......... 453
If your vehicle needs to
be towed ............................................ 454
If your vehicle overheats................ 535
Emergency brake signal.................... 325
Emergency flashers............................. 452
Emergency tire puncture
repair kit ................................................ 509
Energy monitor ....................................... 126
Engine ....................................................... 548
Accessory mode ................................. 218
Compartment ..................................... 403
Engine switch ........................................ 217
Hood ......................................................... 401
How to start the hybrid
system.................................................... 217
Identification number....................... 548
Ignition switch
(power switch) .................................. 217
Overheating ........................................ 535
Power switch ......................................... 217
Engine compartment cover ............. 405
Engine coolant....................................... 409
Capacity................................................. 552
Checking ............................................... 409
Preparing and checking
before winter.................................... 334
E

587Alphabetical index
GS450h_300h_OM_OM30F92E_(EE)
Engine coolant temperature
gauge....................................................... 105
Engine oil..................................................406
Capacity ................................................ 550
Checking .............................................. 406
Oil level warning message ...........466
Oil pressure warning
message..............................................466
Preparing and checking
before winter .................................... 334
Engine switch ...........................................217
Auto power off function ...................219
Changing the power switch
modes ................................................... 218
If your vehicle has to be
stopped in an emergency..........453
Starting the hybrid system............... 217
EPS (Electric Power Steering)........ 325
Function .................................................. 325
Warning light .........................................461
Warning message.............................466
EV drive mode ....................................... 222
First-aid kit storage net....................... 375
Flat tire
Vehicles with spare tire ................. 498
Vehicles without spare tire .......... 509
Floor mats ................................................... 34
Fluid
Brake........................................................554
Hybrid transmission .........................553
Washer ...................................................... 411
Fog lights .................................................. 250
Replacing light bulbs ....................... 449
Switch ...................................................... 250
Follow me home system .................... 238
Footwell light .......................................... 366
Front air conditioning system .......... 346
Front fog lights ....................................... 250
Replacing light bulbs ....................... 449
Switch ...................................................... 250
Wattage ................................................. 449
Front personal lights............................ 367
Front position lights ............................. 237
Light switch............................................ 237
Replacing light bulbs ....................... 449
Welcome light illumination
control ................................................... 140
Front seats ................................................. 175
Adjustment ............................................. 175
Cleaning ................................................ 394
Correct driving posture.................... 36
Driving position memory ................ 178
Head restraints .....................................183
Power easy access system............. 178
Seat heaters.......................................... 362
Seat position memory ....................... 178
Seat ventilators ................................... 362
Front turn signal lights ..........................231
Replacing light bulbs ........... 443, 449
Turn signal lever................................... 231
Wattage .................................................558
F
*: Refer to the “NAVIGATION AND MULTIMEDIA
SYSTEM OWNER’S MANUAL”.