2008 Lexus IS250 radiator cap

292
4-3. Do-it-yourself maintenance
08_IS350/250_U_(L/O_0708)
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. 3 0 1 )
Radiator ( →P. 3 0 1 )
Engine coolant reservoir (→P. 299)

293
4-3. Do-it-yourself maintenance
4
Maintenance and care
08_IS350/250_U_(L/O_0708)
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. 3 0 1 )
Radiator ( →P. 3 0 1 )
Engine coolant reservoir (→P. 299)

300
4-3. Do-it-yourself maintenance
08_IS350/250_U_(L/O_0708)
■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.

5
When trouble arises
401
5-2. Steps to take in an emergency
08_IS350/250_U_(L/O_0708)
■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
●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 down 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