2018 Lexus IS350 radiator cap

4717-3. Do-it-yourself maintenance
7
Maintenance and care
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
IS350 AWD/IS350/IS300 AWD
Engine compartment
Fuse boxes (→P. 502)
Battery ( →P. 480)
Engine oil level dipstick (→P. 473)
Engine coolant reservoir (→P. 476)
Engine oil filler cap (→ P. 474)Brake fluid reservoir (
→P. 479)
Washer fluid tank ( →P. 482)
Electric cooling fans
Condenser ( →P. 478)
Radiator (→ P. 478)1
2
3
4
5
6
7
8
9
10

4727-3. Do-it-yourself maintenance
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
IS300
Fuse boxes (→P. 502)
Battery ( →P. 480)
Intercooler
Engine oil level dipstick (→P. 473)
Engine oil filler cap (→ P. 474)
Engine coolant reservoir (→P. 476) Brake fluid reservoir (
→P. 479)
Washer fluid tank ( →P. 482)
Electric cooling fans
Condenser ( →P. 478)
Intercooler radiator (→ P. 476)
Radiator (→ P. 478)
Intercooler coolant reservoir (→P. 476)1
2
3
4
5
6
7
8
9
10
11
12
13

4777-3. Do-it-yourself maintenance
7
Maintenance and care
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
■Coolant selection
Only use “Toyota Super Long Life Coolant” or a 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 mixt ure of 50% coolant and 50% deionized water.
(Minimum temperature: -31 °F [-35 °C])
Canada:
“Toyota Super Long Life Cool ant” is a mixture of 55% coolant and 45% deionized water.
(Minimum temperature: -44° F [-42°C])
For more details about engine coolant, contact your Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine coolant reservoir cap, drain cock and water
pump.
If you cannot find a leak, have your Lexus de aler test the cap and check for leaks in the
cooling system.
WARNING
■When the engine is hot
Do not remove the engine coolant reservoir cap, intercooler coolant reservoir cap
(IS300), or coolant inlet cap. ( →P. 579)
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE
■When adding 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 cool-
ing. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.

5798-2. Steps to take in an emergency
8
When trouble arises
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
WARNING
■When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
●If steam is seen coming from under the h ood, do not open the hood until the steam
has subsided. The engine compartment may be very hot.
●Keep hands and clothing (especially a tie, a scarf or a muffler) away from the fans and
belts. Failure to do so may cause the hands or clothing to be caught, resulting in seri-
ous injury.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cool ed down sufficiently. Adding cool coolant
to a hot engine too quickly can cause damage to the engine.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreig n matter (such as sand or dust etc.).
●Do not use any coolant additive.
●IS350 AWD/IS350/IS300 AWD: Do not
loosen the coolant inlet cap or coolant reser-
voir cap while the engine and radiator are hot.
(The coolant inlet cap is located under the
engine cover.)
High temperature steam or coolant could
spray out.
●IS300: Do not loosen the coolant inlet cap,
coolant reservoir cap, or intercooler reser-
voir cap while the engine and radiator are hot.
High temperature steam or coolant could
spray out.

649Alphabetical index
IS350 AWD/IS350/IS300 AWD/IS300_U(OM53E34U)
Paddle shift switches ............................ 185
Parking assist sensors
(intuitive parking assist) ....................251
Parking brake...........................................192
Parking lights ............................................194 Light switch ............................................ 194
Replacing light bulbs ....................... 509
PCS (Pre-Collision System) .............. 221 Warning light .......................................523
Personal lights..........................................419 Wattage ................................................. 595
Pop-up display .......................................... 95
Power easy access system .................139
Power outlet ........................................... 428
Power steering (Electric power steering system)................................. 293 Warning light .......................................523
Power windows .......................................154 Door lock linked window operation ........................... 156
Jam protection function ................... 155
Operation ............................................... 154
Window lock switch.......................... 154
Pre-Collision System (PCS) .............. 221 Warning light .......................................523 Radar cruise control (dynamic
radar cruise control)........................ 239
Radiator.....................................................478
Radio ......................................................... 330
Rear passengers’ seat belt reminder lights ....................................524
Rear personal lights .............................. 419 Wattage .................................................595
Rear seats .................................................. 137 Fold down the seatback................... 137
Luggage security system................. 123
Rear sunshade........................................429 Operation.............................................. 429
Reverse operation feature ............ 429
Rear turn signal lights ...........................190 Replacing light bulbs ....................... 507
Turn signal lever .................................. 190
Wattage .................................................595
Rear view mirror Inside rear view mirror......................149
Outside rear view mirrors ............... 151
Rear window defoggers ...................... 412
Refueling.................................................... 210 Capacity................................................. 587
Fuel types............................................... 587
If the fuel filler door cannot be opened ........................... 212
Opening the fuel tank cap .............. 212
PR
*: For vehicles with a naviga tion system, refer to the
“NAVIGATION SYSTEM OWNER’S MANUAL”.