radiator Lexus IS250 2008 Using the air conditioning system and defogger / LEXUS 2008 IS250 OWNER'S MANUAL (OM53699U)

282
4-2. Maintenance
General maintenance
Engine compartment
ItemsCheck points
BatteryMaintenance-free. (P. 3 0 2 )
Brake fluidAt the correct level? ( P. 3 0 1 )
Engine coolantAt the correct level? ( P. 2 9 9 )
Engine oilAt the correct level? ( P. 2 9 5 )
Exhaust systemNo fumes or strange sounds?
Radiator/condenser/hosesNot blocked with foreign matter?
( P. 3 0 1 )
Wa s h e r f l u i dAt the correct level? ( P. 3 0 5 )
Listed below are the general maintenance items that should be performed
at the intervals specified in the “War ranty and Services Guide” or “Owners
Manual Supplement”. It is recomme nded that any problem you notice
should be brought to the attention of your Lexus dealer or qualified service
shop for advice.

287
4-3. Do-it-yourself maintenance
4
Maintenance and care
CAUTION
The engine compartment contains many mechanisms and fluids that may move sud-
denly, become hot, or become electrically energized. To avoid death or serious injury,
observe the following precautions.
■When working on the engine compartment:
●Keep hands, clothing, and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator , exhaust manifold, etc. right after driv-
ing as they may be hot. Oil and other fluids may also be hot.
●Do not leave anything that may burn easi ly, such as paper or rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel or the battery. Fuel
and battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and
corrosive sulfuric acid.
ItemsPa r t s a n d t o o l s
Engine oil level ( P. 2 9 5 )
• “Toyota Genuine Motor Oil” or
equivalent
• Rag or paper towel, funnel (used only for adding engine oil)
Fuses ( P. 3 2 7 )• Fuse with same amperage rating as
original
Tire inflation pressure ( P. 3 1 6 )• Tire pressure gauge
• Compressed air source
Headlight aim ( P. 3 4 1 )• Phillips-head screwdriver
Radiator and condenser (P. 3 0 1 )
Wa s h e r f l u i d (P. 3 0 5 )
• Water washer fluid containing anti-
freeze (for winter use)
•Funnel

288
4-3. Do-it-yourself maintenance
CAUTION
■When working near the electric cooling fan or radiator grille:
Be sure the “ENGINE START STOP” switch is OFF.
With the “ENGINE START STOP” switch in IGNITION ON mode, the electric
cooling fan may automatically start to run if the air conditioning is on and/or the
coolant temperature is high.
( P. 3 0 1 )
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting
in the eyes.
NOTICE
■If you remove the air cleaner:
Driving with the air filter removed may cau se excessive engine wear due to dirt in
the air. Also a backfire could cause a fire in the engine compartment.

292
4-3. Do-it-yourself maintenance
Engine compartment
IS350
Battery (P. 302)
Engine oil level dipstick (P. 295)
Engine oil filler cap (P. 295)
Brake fluid reservoir (P. 301)
Fuse boxes ( P. 327)Washer fluid tank
(P. 305)
Electric cooling fans
Condenser ( P. 301)
Radiator ( P. 301)
Engine coolant reservoir (P. 2 9 9 )

293
4-3. Do-it-yourself maintenance
4
Maintenance and care
IS250
Battery (P. 302)
Engine oil level dipstick (P. 295)
Engine oil filler cap (P. 295)
Brake fluid reservoir (P. 301)
Fuse boxes ( P. 327)Washer fluid tank
(P. 305)
Electric cooling fans
Condenser ( P. 301)
Radiator ( P. 301)
Engine coolant reservoir (P. 2 9 9 )

300
4-3. Do-it-yourself maintenance
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, engine coolant filler 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.
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 engine 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 damaging parts or paint.

301
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.
Brake fluid
■ Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
Make sure to check the fluid type and prepare the necessary items.
■ Adding fluid
CAUTION
■When the engine is hot
Do not touch the radiator or condenser, as they may be hot and you may be burned.
Fluid typeFMVSS No.116 DOT 3 or SAE J1703 brake fluid
ItemsClean funnel
■Brake fluid can absorb moisture from the air
Excess moisture in the fluid can cause a dangerous loss of braking efficiency. Use
only newly opened brake fluid.

400
5-2. Steps to take in an emergency
If your vehicle overheats
If your 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 and car efully lift the hood.
If you do not see steam: Leave the engine running and carefully lift the hood.
Remove the engine compartment cover. ( P. 2 9 4 )
Check to see if the cooling fan is operating.
If the fan is operating: Wait until the temperature of the engine (shown on the
instrument cluster) 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
engine coolant level and inspect
the radiator core (radiator) for
any leaks.STEP1
STEP2
STEP3
STEP4
STEP5

5
When trouble arises
401
5-2. Steps to take in an emergency
■Overheating
If you observe the following, 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 other belts 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 engine coolant
Wait until the engine has cooled do wn before adding engine coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot engine too quickly
can cause damage to the engine.
Add engine coolant if required.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. ( P. 411)
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

457
Alphabetical index
Overhead courtesy lightsOverhead courtesy lights ............... 231
Wattage ................................................. 420
Overheating, Engine .......................... 400
Parking assist sensors .......................... 164
Parking brake .......................................... 129
Parking lights Replacing light bulbs ....................... 342
Switch ........................................................ 143
Wattage ................................................. 420
PCS.............................................................. 176
Personal lights Switch ...................................................... 234
Power outlet ........................................... 250
Power windows.........................................64
Pre-collision system .............................. 176
Radar cruise control ............................. 155
Radiator......................................................301
Radio ......................................................... 204
RDS ............................................................ 205
Rear sunshade ....................................... 256
Rear turn signal lights Replacing light bulbs ....................... 342
Wattage ................................................. 420
Rear view mirror Compass ............................................... 269
Rear window defogger ...................... 200
Replacing Electronic key battery ..................... 325
Fuses .........................................................327
Light bulbs ............................................ 342
Reporting safety defects for U.S. owners ..........................................444 Scuff lighting ............................................ 231
Seat belts
Adjusting the seat belt ........................ 53
Automatic locking retractor ............ 54
Child restraint system installation..............................................98
Cleaning and maintaining the seat belts .....................................278
Emergency locking retractor.......... 54
How to wear your seat belt ............. 52
How your child should wear the seat belt ..........................................55
Pregnant women, proper seat belt use ......................... 54
Reminder light .....................................362
Seat belt extenders ..............................55
Seat belt pretensioners ...................... 53
Seat heaters .................................. 251, 253
Seat position memory ............................ 49
Seat ventilators ...................................... 253
Seating capacity ..................................... 182
Seats Adjustment ............................................... 44
Adjustment precautions .................... 45
Child seats/child restraint system installation..............................98
Cleaning ................................................. 277
Driver’s seat position memory ....... 46
Front passenger seat position memory .................................................. 49
Head restraint ...........................................51
Properly sitting in the seat .................77
Seat heaters ............................... 251, 253
Ventilated seats ..................................253
Service reminder indicators ............. 136
P
R
S