2008 Lexus GS450h coolant

428
4-3. Do-it-yourself maintenance
GS_HV_U
December 27, 2007 1:38 pm
Radiator and condenserCheck the radiator and condenser and clear any foreign objects. 
If either of the above parts are extremely dirty or you are not sure of their
condition, have your vehicle checked by your Lexus dealer.
CAUTION
■When the hybrid system is hot
Do not remove the radiator and reservoir cap. 
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing burns or other injuries.
NOTICE
■When adding the coolant
Coolant is neither plain water not straight antifreeze. The correct mixture of water
and antifreeze must be used to provide proper lubrication, corrosion protection
and cooling. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to prevent it from damaging to parts or paint.
CAUTION
■When the hybrid system is hot
Do not touch the radiator or condenser, as they may be hot and you may be burned.

488
5-1. Essential information
GS_HV_U
December 12, 2007 3:50 pm
If you think something is wrong
If you notice any of the following symptoms, your vehicle probably needs
adjustment or repair. Contact your Lexus dealer as soon as possible.
■ Visible symptoms
●Fluid leaks under the vehicle 
(Water dripping from the air conditioning after use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temper ature gauge needle continually points
higher than normal
■ Audible symptoms
●Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the hybrid system
■ Operational symptoms
●Engine missing, stumbling or running rough
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one side when driving on a level road
● Loss of brake effectiveness, sp ongy feeling, pedal almost touches
the floor

538
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
If your vehicle overheats
If your hybrid system 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 hybrid system and carefully lift the hood.
If you do not see steam: Leave the hybrid system running and carefully lift the hood.
Remove the engine compartment cover. ( P. 421)
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 hybrid system.
If the fan is not operating: 
Stop the hybrid system immed iately and call your local
Lexus dealer.
After the hybrid system 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
539
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
■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.
●The message “HYBRID SYSTEM OVERHEAT” is displayed on the multi-infor-
mation display.
CAUTION
■To prevent an accident or injury when in specting under the hood of your vehicle
●Keep hands and clothing away from the fan and engine drive belt while the hybrid
system is running.
●Do not loosen the radiator cap while the hybrid system and radiator are hot. 
Serious injury, such as burns, may resu lt 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 4 8 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

540
5-2. Steps to take in an emergency
GS_HV_U
December 12, 2007 3:50 pm
NOTICE
■When adding coolant
Wait until the hybrid system has cooled down before adding coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid system.

548
6-1. Specifications
GS_HV_U
December 12, 2007 3:50 pm
Cooling system
Ignition system
Capacity
Gasoline engine
Power control unit9.8 qt. (9.3 L, 8.1 lmp.qt.)
3.0 qt. (2.9 L, 2.5 lmp.qt.)
Coolant type
Use 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.
Spark plug
Make DENSOFK20HBR11
Gap0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust gap when tuning engine.

563
6-1. Specifications
6
Vehicle specifications
GS_HV_U
December 12, 2007 3:50 pm
Tire related termMeaning
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of transmission, power
steering, power brakes, power windows, power seats,
radio and heater, to the extent that these items are
available as factory-installed equipment (whether
installed or not)
Curb weight
The weight of a motor vehicle with standard equip-
ment, including the maximum capacity of fuel, oil and
coolant, and if so equipped, air conditioning and
additional weight optional engine
Maximum loaded vehicle
weight
The sum of: 
(a) Curb weight 
(b) Accessory weight 
(c) Vehicle capacity weight 
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the number of occupants speci-
fied in the second column of Table 1* that follows
Occupant distributionDistribution of occupants in a vehicle as specified in
the third column of Table 1* below
Production options
weight
The combined weight of installed regular production
options weighing over 5 lb. (2.3 kg) in excess of the
standard items which they replace, not previously
considered in curb weight or accessory weight,
including heavy duty brakes, ride levelers, roof rack,
heavy duty battery, and special trim
RimA metal support for a tire or a tire and tube assembly
upon which the tire beads are seated
Rim diameter 
(Wheel diameter)Nominal diameter of the bead seat

586
Alphabetical index
GS_HV_U
December 12, 2007 3:50 pm
DoorsDoor lock................................ 35, 47, 50
Rear door child protector .................. 51
Driver’s seat belt reminder light .....493
Driver’s seat position memory ...........60
Driving Correct posture .................................... 93
Procedures .............................................128
DVD player/changer.......................... 266
Electric power steering ..................... 200
Electronic key If the electronic key does 
not operate properly ......................531
Replacing battery .............................. 454
Emergency, in case of If a warning light turns on ................491
If a warning message is displayed ........................................... 500
If the electronic key does 
not operate properly ......................531
If the hybrid system 
will not start .......................................528
If the shift lever cannot be  shifted from “P”................................ 529
If the 12 volt battery is 
discharged ....................................... 534
If you have a flat tire ............... 517, 527
If you lose your keys.........................530
If you think something is 
wrong .................................................. 488
If your vehicle becomes stuck.......541
If your vehicle needs to be 
towed ................................................... 482
If your vehicle overheats ................538
Energy monitor......................................... 27 Engine
ACCESSORY mode .....................139
Compartment ..................................... 420
Hood ......................................................... 417
How to start the 
hybrid system..................................... 138
If the hybrid system 
will not start ....................................... 528
Overheating ........................................ 538
Power (ignition) switch .................... 138
Engine compartment cover ............... 421
Engine coolant temperature 
gauge ...................................................... 148
Engine/power control unit coolant Capacity ................................................ 548
Checking................................................ 427
Preparing and checking 
before winter...................................... 215
Engine oil Capacity .................................................547
Checking................................................ 422
Preparing and checking 
before winter...................................... 215
Engine oil maintenance data ........... 425
Event data recorder ............................ 489
First-aid kit storage belt ..................... 375
Floor mats ................................................ 374
Fluid Brake ........................................................429
Washer....................................................434
Fog lights Switch .......................................................... 161
Wattage ................................................. 552
Foot light .................................................. 352
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