2005 Lexus GX470 cooling

STARTING AND DRIVING
396
ENGINE EXHAUST CAUTIONCAUTION
Avoid inhaling the engine exhaust. It contains
carbon monoxide, which is a colorless and odorless
gas. It can cause unconsciousness or even death.
 Make sure the exhaust system has no holes or loose
connections. The system should be checked from
time to time. If you hit something, or notice a change
in the sound of the exhaust, have the system checked
immediately.
 Do not run the engine in a garage or enclosed area
except for the time needed to drive the vehicle in or
out. The exhaust gases cannot escape, making this
a particularly dangerous situation.
 Do not remain for a long time in a parked vehicle with
the engine running. If it is unavoidable, however, do
so only in an unconfined area and adjust the heating
or cooling system to force outside air into the vehicle.
 Keep the back door closed while driving. An open or
unsealed back door may cause exhaust gases to be
drawn into the vehicle.

IN CASE OF AN EMERGENCY
497
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.
IF YOU HAVE A FLAT TIRE
1. Reduce your speed gradually, keeping a straight
line. Move cautiously off the road to a safe place
Ð well away from the traffic. Avoid stopping on the
center divider of a highway. Park on a level spot with
firm ground.
2. Stop the engine and turn on your emergency
flashers.
3. F i r m l y s e t t h e p a r k i n g b r a k e a n d p u t t h e
transmission in ªPº.
4. Have everyone get out of the vehicle on the side
away from traffic.
5. Read the following instructions thoroughly.
CAUTION
When jacking, be sure to observe the following
to reduce the possibility of personal injury:
Turn off the active height control suspension
by pushing the active height control switch.
 Follow jacking instructions.

61PY009
INTRODUCTION
537
NOTICE
You should not attempt to remove the theft preventionlabels as it may violate certain state or federal laws.
ENGINE COMPARTMENT OVERVIEW
1Engine oil leveldipstick
2Engine oil filler cap
3Brake fluid reservoir
4Fuse box
5Battery
6Condenser
7Electric cooling fan
8Radiator
9Engine coolantreservoir
10Washer fluid tank
11Power steering fluidreservoir

ENGINE
548Ð COOLING SYSTEM
Capacity
12.9 L (13.6 qt., 11.4 Imp. qt.)
Coolant typeªToyota Super Long Life Coolantº 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.
NOTE:
ªToyota Super Long Life Coolantº is used in your Lexus vehicle at facto\
ry fill. In order to avoid technical problems, only use ªToyota
Super Long Life Coolantº 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 combi\
nation of low
phosphates and organic acids.) Please contact your Lexus dealer for fu\
rther details.
Ð FUEL
Fuel type
Unleaded gasoline only
Octane rating87 (Research octane number 91) or higher

ENGINE
553
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 ignition
switch to ªACCº or ªLOCKº 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
561
If the coolant level drops within a short time after replenishing,
there
may be a leak in the system. Visually 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 radiator
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
562
Coolant type selection
Use of improper coolants may damage your engine cooling
system.
Only use ªToyota Super Long Life Coolantº 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. Ð ªToyota Super Long Life Coolantº is a mixture
of 50% coolant and 50% deionized water. This coolant
provides protection down to about ±35 C (±31F).
For Canada Ð ªToyota Super Long Life Coolantº is a mixture
of 55% coolant and 45% deionized water. This coolant
provides protection down to about ±42 C (±44F).
NOTICE
Do not use plain water alone.

ENGINE
563
Lexus recommends ªToyota Super Long Life Coolantº, which
has been tested to ensure that it will not cause corrosion nor
result in m
alfunction of your engine coolant system with proper
usage. ªToyota Super Long Life Coolantº 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.
CHECKING THE RADIATOR AND CONDENSER
If either of the above parts are extremely dirty or you are not
sure of their condition, take your vehicle to a 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.