2008 Lexus GX470 engine coolant

328
4-3. Do-it-yourself maintenance
Engine coolantThe coolant level is satisfactory if it is between the “F” and “L” lines on the
reservoir when the engine is cold.
Reservoir cap
Full
Low
If the level is on or below the “L”
line, add coolant up to the “F” line.
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, reservoir cap, radiator cap, drain cock and water
pump.
If you cannot find a leak, have your Lexus dealer pressure test the cap and check for
leaks in the cooling system.
■Coolant selection
Only use “Toyota Super Long Life Coolant” or similar high quality ethylene glycol
based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life
hybrid organic acid technology.
U.S.A.: “Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50%
deionized water. (Enabled: -31F [-35 C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deionized water. (Enabled: -44 F [-42C])
For more details about engine coolant, contact your Lexus dealer.

329
4-3. Do-it-yourself maintenance
4
Maintenance and care
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 engine is hot
Do not remove the radiator 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 nor 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 damage to parts or paint.
CAUTION
■The radiator and condenser may be hot after driving
To prevent burns, do not touch the radiator or condenser after driving.

5
When trouble arises
377
5-1. Essential information
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 engine
■ 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

408
5-2. Steps to take in an emergency
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: Turn off the engine and carefully lift the hood.
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 immediately and call your local Lexus
dealer.
After the engine has cooled
down sufficiently, check the
coolant level and inspect the
radiator for any leaks.STEP1
STEP2
STEP3
STEP4

5
When trouble arises
409
5-2. Steps to take in an emergency
■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
●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 result from hot coolant and steam released
under pressure.
NOTICE
■When adding 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.
Add coolant if required.
Water can be used as an emer-
gency measure if coolant is
unavailable. ( P. 4 1 6 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP5

416
6-1. Specifications
Cooling system
Ignition system
Capacity13.6 qt. (12.9 L, 11.4 Imp.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 DENSO NGKSK20R11
IFR6A11
Gap0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do no t adjust the gap when tuning the engine.

429
6-1. Specifications
6
Vehicle specifications
Warning: The temperature grades for this tire are established for a tire that
is properly inflated and not overloaded.
Excessive speed, underinflation, or excessive loading, either separately or in
combination, can cause heat build up and possible tire failure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation
pressureTire pressure when the vehicle has been parked for
three hours or more, or has not been driven more
than 1 mile or 1.5 km under that condition
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a tire
may be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a man-
ufacturer
Accessory weight
The combined weight (in excess of those standard
items which may be replaced) of automatic trans-
mission, power steering, power brakes, power win-
dows, 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

450
Alphabetical index
If the vehicle battery is discharged .......................................405
If you have a flat tire ...........................391
If you lose your keys.........................404
If you think something is wrong ....................................................377
If your vehicle becomes stuck...... 410
If your vehicle needs to be towed ................................................... 372
If your vehicle overheats ............... 408
Engine Compartment ....................................... 321
Engine switch.......................................... 118
Hood........................................................ 320
How to start the engine..................... 118
If the engine will not start........................................................ 402
Overheating........................................ 408
Engine compartment cover ............. 322
Engine coolant temperature gauge....................................................... 126
Engine coolant Capacity ...................................................416
Checking ............................................... 328
Preparing and checking before winter ...................................... 176
Engine immobilizer system.................. 70
Engine oil Capacity ...................................................415
Checking ............................................... 323
Preparing and checking before winter ...................................... 176
Engine oil maintenance data............ 326
Event data recorder ............................ 379 First-aid kit storage belt ..................... 279
Flat key ......................................................... 22
Floor mats .................................................277
Fluid
Brake ....................................................... 330
Power steering ..................................... 331
Washer................................................... 335
Fog lights Switch ........................................................ 137
Wattage ................................................. 420
Foot light .................................................. 256
Front passenger’s seat belt
reminder light .....................................385
Front passenger occupant classification system ............................ 90
Front seats Adjustment ............................................... 34
Driving position memory ..................45
Front turn signal lights Wattage ................................................. 420
Fuel Capacity .................................................. 414
Fuel gauge .............................................. 126
Gas station information ................. 460
Information ............................................. 421
Refueling .................................................... 67
Fuel door ......................................................67
Fuel filler door ............................................67
Fuses .......................................................... 355F