coolant Lexus GX460 2010 Scheduled Maintenance Guide / LEXUS 2010 GX460 (OM60E69U) User Guide

616
4-3. Do-it-yourself maintenance
GX460_U.S.A. (OM60E69U)
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, engine coolant reservoir caps, drain cock and
water pump. 
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in
the cooling system.
CAUTION
■When the engine is hot
Do not remove the engine coolant 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 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.

5
When trouble arises
681
5-1. Essential information
GX460_U.S.A. (OM60E69U)
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 roughly
● 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

744
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60E69U)
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.
Remove the engine compartment covers. ( P. 6 0 9 )
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
STEP4

5
When trouble arises
745
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60E69U)
After the engine has cooled
down sufficiently, check the
coolant level and inspect the
radiator core (radiator) for any
leaks.
Add engine coolant if required.
Water can be used as an emer-
gency measure if engine coolant
is unavailable. (P. 7 5 5 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP5
STEP6

746
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60E69U)
■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 coolant reservoir 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.

755
6-1. Specifications
6
Vehicle specifications
GX460_U.S.A. (OM60E69U)
Cooling system
Ignition system
Capacity 
(reference)
With rear
heater16.3 qt. (15.4 L, 13.6 Imp.qt.)
Without rear
heater14.5 qt. (13.7 L, 12.1 Imp.qt.)
Coolant type
Use either of the following:• “Toyota Super Long Life Coolant”
• A similar high-quality ethylene glycol-
based non-silicate, non-amine, non-nitrite,
and non-borate coolant with long-life
hybrid organic acid technology
Do not use plain water alone.
Spark plug
MakeDENSO SK20HR11
Gap0.043 in. (1.1 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

772
6-1. Specifications
GX460_U.S.A. (OM60E69U)
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

813
Alphabetical index
GX460_U.S.A. (OM60E69U)
EngineAccessory mode ................................. 179
Compartment .................................... 608
Engine switch ........................................ 179
Hood ....................................................... 607
How to start the engine.................... 179
Identification number......................... 751
If the engine will not start ................734
Ignition switch........................................ 179
Overheating..........................................744
Engine compartment cover............. 609
Engine coolant Capacity................................................. 755
Checking .................................................615
Preparing and checking 
before winter ...................................... 361
Engine coolant temperature 
gauge ....................................................... 195
Engine immobilizer system ..................114
Engine oil Capacity................................................. 753
Checking .................................................610
Preparing and checking 
before winter ...................................... 361
Engine oil maintenance data ............. 612
Engine switch ........................................... 179
Engine switch light .................................. 511
Event data recorder............................ 683
Floor mats................................................ 556
Fluid Brake .........................................................618
Power steering ................................... 620
Washer ................................................... 626 Fog lights
Replacing light bulbs ....................... 664
Switch....................................................... 233
Wattage ....................................................761
Footwell light .............................................511
Four-wheel drive system .....................317
Front passenger occupant 
classification system .......................... 140
Front passenger’s seat belt 
reminder light......................................690
Front seats Adjustment ............................................... 64
Driving position memory .................. 79
Front side marker light Replacing light bulbs ....................... 665
Wattage ....................................................761
Front turn signal lights Replacing light bulbs ....................... 666
Switch.........................................................192
Wattage ....................................................761
Fuel Capacity ................................................. 752
Fuel gauge.............................................. 195
Fuel pump shut off system............ 682
Gas station information ..................824
Information ............................................ 762
Refueling.................................................. 109
Fuel door ................................................... 109
Fuel filler door ......................................... 109
Fuel pump shut off system .................682
Fuses .......................................................... 645
F

820
GX460_U.S.A. (OM60E69U)
What to do if...
What to do if...
A tire puncturesP. 7 2 0If you have a flat tire
The engine does not start
P. 1 1 4Engine immobilizer system
P. 7 3 4If the engine will not start
P. 74 1If the battery is discharged
The shift lever cannot be 
moved outP. 7 3 6If 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 4If your vehicle overheats
The key is lostP. 7 3 7If you lose your keys
The battery is dischargedP. 74 1If the vehicle has a discharged battery
The doors cannot be lockedP. 5 1Side doors
P. 5 4Back door
The horn begins to soundP. 1 1 6Alarm
The vehicle is stuck in mud or
sandP. 74 7If the vehicle becomes stuck