2006 Lexus GS430 cooling

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.

ENGINE
514– COOLING SYSTEM
Capacity
10.1 L (10.7 qt., 8.9 lmp.qt.)
Coolant type”Toyota Super Long Life Coolant” or similar high quality ethylene glyco\
l
based non −silicate, non− amine, non−nitrite, and non −borate coolant
with long −life hybrid organic acid technology (Coolant with long −life
hybrid organic acid technology is a combination of low phosphates and
organic acids.)
Do not use plain water alone.
NOTE:
“Toyota Super Long Life Coolant” is used in your Lexus vehicle at factory fil\
l. In order to avoid technical problems, 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. (Coolant with long −life hybrid organic acid technology is a combination of low
phosphates and organic acids.) Do not use plain water alone. Please contact you\
r Lexus dealer for further details.
– IGNITION SYSTEM
Spark plug – Make DENSO NGK
– Gap
SK20R11
IFR6A11
1.1 mm (0.043 in.)
– ELECTRICAL SYSTEM
Battery – Open voltage at 20 C (68F):
– Charging rates
12.7V Fully charged
12.3V Half charged
11.9V Discharged
[Voltage that is checked 20 minutes after the engine switch is off with all
the lights turned off]
5A max.

ENGINE
517
– COOLING SYSTEM
Capacity
9.1 L (9.6 qt., 8.0 lmp.qt.)
Coolant type”Toyota Super Long Life Coolant” or similar high quality ethylene glyco\
l
based non −silicate, non− amine, non−nitrite, and non −borate coolant
with long −life hybrid organic acid technology (Coolant with long −life
hybrid organic acid technology is a combination of low phosphates and
organic acids.)
Do not use plain water alone.
NOTE:
“Toyota Super Long Life Coolant” is used in your Lexus vehicle at factory fil\
l. In order to avoid technical problems, 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. (Coolant with long −life hybrid organic acid technology is a combination of low
phosphates and organic acids.) Do not use plain water alone. Please contact you\
r Lexus dealer for further details.
– IGNITION SYSTEM
Spark plug – Make DENSO NGK
– Gap
FK20HBR11
ILFR6D11T
1.1 mm (0.043 in.)
– ELECTRICAL SYSTEM
Battery – Open voltage at 20 C (68F):
– Charging rates
12.7V Fully charged
12.3V Half charged
11.9V Discharged
[Voltage that is checked 20 minutes after the engine switch is off with all
the lights turned off]
5A max.

ENGINE
520
FUEL PUMP SHUT OFF SYSTEM
The fuel pump shut off system stops supplying fuel to the
engine to minimize the risk of fuel leakage when the engine
stalls or an airbag inflates upon collision. To restart the engine
after the fuel pump shut off system activates, turn the engine
switch off once and start it.
CAUTION
Inspect the ground under the vehicle before restarting
the engine. If you find that liquid has leaked onto the
ground, it is the fuel system that has been damaged and
it is in need of repair. In this case, do not restart the
engine.
FACTS ABOUT ENGINE OILCONSUMPTION
Functions of engine oil
Engine oil has the primary function of lubricating and cooling
the inside of the engine, and plays a major role in maintaining
the engine in proper working order.
Engine oil consumption
It is normal that an engine should consume some engine
oil during normal engine operation. The causes of oil
consumption in a normal engine are as follows.
Oil is used to lubricate pistons, piston rings and cylinders.
A thin film of oil is left on the cylinder wall when a piston
moves downwards in the cylinder. High negative pressure
generated when the vehicle is decelerating sucks some of
this oil into the combustion chamber. This oil as well as
some part of the oil film left on the cylinder wall is burned by
the high temperature combustion gases during the
combustion process.
 Oil is also used to lubricate the stems of the intake valves.
Some of this oil is sucked into the combustion chamber
together with the intake air and is burned along with the fuel.
High temperature exhaust gases also burn the oil used to
lubricate the exhaust valve stems.

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
528
Coolant type selection
Use of improper coolants may damage your engine cooling
system.
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. (Coolant with long −life hybrid organic
acid technology is a combination of low phosphates and
organic acids.)
For the U.S.A.—“Toyota Super Long Life Coolant” is a mixture
of 50% coolant and 50% deionized water. This coolant
provides protection down to about −35C (− 31F).
For Canada—“Toyota Super Long Life Coolant” is a mixture of
55% coolant and 45% deionized water. This coolant provides
protection down to about −42C (− 44F).
NOTICE
Do not use plain water alone.
Lexus recommends “Toyota Super Long Life Coolant,” which
has been tested to ensure that it will not cause corrosion nor
result in malfunction of your engine coolant system with proper
usage. “Toyota Super Long Life Coolant” is formulated with
long−life hybrid organic acid technology and has been
specifically designed to avoid engine cooling system
malfunction on Lexus vehicles.
Please contact your Lexus dealer for further details.