2010 Lexus IS250C radiator

393
4-3. Do-it-yourself maintenance
4
Maintenance and care
10_IS250C/350C_U
IS250C
Battery (→P. 4 0 2 )
Engine oil level dipstick (→P. 395)
Engine oil filler cap (→P. 395)
Brake fluid reservoir (→P. 4 0 0 )
Fuse boxes ( →P. 4 2 7 )Washer fluid tank
(→P. 405)
Electric cooling fans
Condenser ( →P. 4 0 0 )
Radiator ( →P. 4 0 0 )
Engine coolant reservoir (→P. 398)

399
4-3. Do-it-yourself maintenance
4
Maintenance and care
10_IS250C/350C_U
■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.

400
4-3. Do-it-yourself maintenance
10_IS250C/350C_U
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.

5
When trouble arises
509
5-2. Steps to take in an emergency
10_IS250C/350C_U
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. 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 cover. ( →P. 394)
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

510
5-2. Steps to take in an emergency
10_IS250C/350C_U
■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 inspecting 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 compartment may be very hot, causing serious
injury such as burns.
●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.
Add engine coolant if required.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. (→P. 5 3 1 )
Have the vehicle checked at your nearest Lexus dealer as soon as pos-
sible.
STEP6

578
Alphabetical index
10_IS250C/350C_U
Parking assist sensors .......................... 198
Parking brake .......................................... 157
Parking lightsReplacing light bulbs........................ 444
Switch ........................................................ 173
Wattage....................................................541
PCS ............................................................. 212
Personal lights Switch ...................................................... 339
Power outlet............................................354
Power windows ........................................ 78
Pre-collision system.............................. 212
Radar cruise control ............................. 187
Radiator ................................................... 400
Radio .......................................................... 242
RDS ............................................................ 244
Rear turn signal lights
Replacing light bulbs........................ 444
Wattage....................................................541
Rear view mirror Compass ...............................................368
Rear window defogger.......................238
Replacing Electronic key battery...................... 425
Fuses .........................................................427
Light bulbs............................................. 444
Tires ..........................................................486
Reporting safety defects for U.S. owners ..........................................564
Retractable hardtop ................................ 81 Scuff lights................................................ 338
Seat belts
Adjusting the seat belt ....................... 65
Automatic locking retractor ............67
Child restraint system installation ............................................ 120
Cleaning and maintaining the seat belts .................................... 378
Emergency locking retractor.......... 67
How to wear your seat belt ............ 65
How your child should wear the seat belt.......................................... 68
Pregnant women, proper seat belt use ........................ 68
Reminder light..................................... 465
Seat belt extenders.............................. 68
Seat belt guide........................................66
Seat belt pretensioners ...................... 67
Seat heaters ............................................ 355
Seat position memory............................ 60
Seat ventilators ...................................... 355
Seating capacity......................................219
Seats Adjustment ................................................ 51
Adjustment precautions ................... 55
Child seats/child restraint
system installation ............................ 120
Cleaning ................................................. 377
Driver’s seat position memory ...... 56
Front passenger seat position
memory ................................................. 60
Head restraint ......................................... 62
Properly sitting in the seat................ 98
Seat heaters ......................................... 355
Ventilated seats.................................. 355
Service reminder indicators .............165P
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