2006 Lexus GS430 radiator

IN CASE OF AN EMERGENCY
467
IF YOUR VEHICLE OVERHEATS
If your engine coolant temperature gauge indicates
overheating, if you experience a loss of power, or if you
hear a loud knocking or pinging noise, the engine has
probably overheated.
When the engine overheats
Pull safely off the road, stop the vehicle and turn on your
emergency flashers. Put the transmission in ”P” and apply the
parking brake.
A: If steam is coming from your engine:
Turn off the engine. Leave the hood closed until there is no sign
of steam or coolant. Your engine could have been seriously
damaged already. Call your Lexus dealer for assistance.
CAUTION
To help avoid personal injury, keep the hood closed until
there is no steam. Escaping steam or coolant is sign of
very high pressure.
B: If no steam is coming from your engine:
Leave the engine running and turn off the air conditioning.
Check the following.
 Is the cooling fan operating?
 Is the coolant in the acceptable range?
 Is the engine drive belt O.K.?
CAUTION
When the engine is running, keep hands and clothing
away from the moving fan and engine drive belt.
 Do not attempt to remove the radiator cap when the
engine and radiator are hot. Serious injury could
result from scalding hot fluid and steam blown out
under pressure.
If the cooling fan is not operating or the coolant is not in the
acceptable range, turn off the engine and call your Lexus
dealer.
If both conditions are O.K., after the engine coolant
temperature has cooled to normal, continue driving your
vehicle.
If the engine coolant temperature does not cool down, or your
vehicle overheats again, have it checked as soon as possible
by your Lexus dealer.

MAINTENANCE
493
Where to go for service?
Lexus technicians are well −trained specialists and are kept up
to date with the latest service information through technical
bulletins, service tips, and in −dealership training programs.
They are well informed about the operation of all the systems
on your vehicle.
You can be confident that your Lexus dealer’s service
department performs the best job to meet the maintenance
requirements of your vehicle.
Your copy of the repair order is proof that all required
maintenance has been performed for warranty coverage. If
any problems should arise with your vehicle while under
warranty, your Lexus dealer will promptly take care of it. Again,
be sure to keep a copy of the repair order for any service
performed on your Lexus.
What about doityourself maintenance?
Many of the maintenance items are easy to do yourself, if you
have a little mechanical ability and a few basic automotive
tools. Simple instructions for how to perform them are
presented in Section 6.
If you are a skilled do −it− yourself mechanic, the Lexus service
manuals are recommended. Please be aware that
do− it−yourself maintenance can affect your warranty
coverage. See “Owner’s Guide”, “Owner’s Manual
Supplement” or “Warranty Booklet” for the details.
GENERAL MAINTENANCE
Listed below are the general maintenance items that should be
performed at the intervals specified. It is recommended that
any problem you notice be brought to the attention of your
Lexus dealer or qualified service shop for their advice.
CAUTION
Make these checks only with adequate ventilation if you
run the engine.
Engine compartment
Items listed below should be checked from time to time,
e.g. each time when refueling.
Washer fluid
Make sure there is suf ficient fluid in the tank. See page 579 for
additional information.
Engine coolant level
Make sure the coolant level is between the Upper and Lower
lines on the see−through reservoir when the engine is cold.
See page 527 for additional information.
Radiator, condenser and hoses
Check that the front of the radiator and condenser are clean
and not blocked with leaves, dirt, or insects. See page 529 for
additional information.

G61002
INTRODUCTION
502
ENGINE COMPARTMENT OVERVIEW (GS430)
1 Engine oil filler cap
2 Engine oil level
dipstick
3 Brake fluid reservoir
4 Fuse box
5 Washer fluid tank
6 Engine coolant
reservoir
7 Electric cooling fans
8 Condenser
9 Radiator
10 Fuse box
11 Battery

G61003
INTRODUCTION
503
ENGINE COMPARTMENT OVERVIEW (GS300)
1 Engine oil level
dipstick
2 Engine oil filler cap
3 Brake fluid reservoir
4 Fuse box
5 Washer fluid tank
6 Engine coolant
reservoir
7 Electric cooling fans
8 Condenser
9 Radiator
10 Fuse box
11 Battery

INTRODUCTION
506
CAUTION
When the engine is running, keep hands, clothing,
and tools away from the moving fan and engine drive
belt. (Removing rings, watches, and ties is
advisable.)
 Right after driving, the engine compartment the
engine, radiator and exhaust manifold, etc. will be
hot. So be careful not to touch them. Oil and other
fluids may also be hot.
 Do not leave anything that may burn easily, such as
paper or rags, in the engine compartment.
 Do not smoke, cause sparks or allow open flames
around fuel or the battery. Their fumes are
flammable.
 Do not get under your vehicle with just the body jack
supporting it. Always use automotive jack stands or
other solid supports.
 Be sure the engine switch is off if you work near the
electric cooling fan or radiator grille. With the engine
switch on, the electric cooling fan may automatically
start to run if the air conditioning is on and/or if the
coolant temperature is high.
 Use eye protection whenever you work on or under
your vehicle where you may be exposed to flying or
falling material, fluid spray, etc.
 Be extremely cautious when working on the battery.
It contains poisonous and corrosive sulfuric acid.
NOTICE
Remember that battery and ignition cables carry high
currents or voltages. Be careful of accidentally
causing a short circuit.
 Add only ”T oyota Super Long Life Coolant” or similar
high quality ethylene glycol based nonsilicate,
nonamine, nonnitrite, and nonborate coolant with
longlife hybrid organic acid technology to fill the
radiator. “Toyota Super Long Life Coolant” is a
mixture of 50% coolant and 50% deionized water (for
the U.S.A.) or 55% coolant and 45% deionized water
(for Canada).
 If you spill some of the coolant, be sure to wash it off
with water to prevent it from damaging the parts or
paint.
 Before closing the engine hood, check to see that you
have not forgotten any tools, rags, etc.
 Do not drive with the air cleaner removed, or
excessive engine wear could result. Also backfiring
could cause a fire in the engine compartment.
 Be careful not to scratch the glass surface with the
wiper frame.

SECTION 6 – 2
511
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications (GS430)512
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications (GS300) 515
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 518
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . . . . . . . .
Fuel pump shut off system 520
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Facts about engine oil consumption 520
. . . . . . . . . . . . . . . . . . . . . . . .
Used engine oil 522
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . .
Checking the engine oil level 522
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the engine coolant level 527
. . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the radiator and condenser 529
. . . . . . . . . . . . . . . . . . . . . . .
Spark plugs 529
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . .

ENGINE
527
CHECKING THE ENGINE COOLANTLEVEL
G62007
GS430
1
Reservoir cap 2“FULL” line 3“LOW” line
G62008
GS300
1
Reservoir cap 2“FULL” line 3“LOW” line Look at the seethrough coolant reservoir when the
engine is cold. The coolant level is satisfactory if it is
between the”FULL” and ”LOW” lines on the reservoir. If
the level is low, add the coolant. (For the coolant type, see
“Coolant type selection” described below.)
The coolant level in the reservoir will vary with engine
temperature. However, if the level is on or below the ”LOW”
line, add coolant. Bring the level up to the ”FULL” line.
If the coolant level drops within a short time after replenishing,
there
may be a leak in the system. V isually check the radiator,
hoses, engine coolant filler cap, radiator cap and drain cock
and water pump.
If you can find no leak, have your Lexus dealer test the cap
pressure and check for leaks in the cooling system.
CAUTION
To prevent burning yourself, do not remove the radiator
cap when the engine is hot.

ENGINE
529
CHECKING THE RADIATOR ANDCONDENSER
If either of the above parts are extremely dirty or you are not
sure of their condition, take your vehicle to your Lexus dealer.
CAUTION
To prevent burning yourself , be careful not to touch the
radiator or condenser when the engine is hot.
NOTICE
To prevent damage to the radiator and condenser, do
not perform the work by yourself.
SPARK PLUGS
62R031c
GS430
Your engine is fitted with iridiumtipped spark plugs.
NOTICE
Use only iridiumtipped spark plugs and do not adjust
gaps for your engine performance and smooth
drivability.