2015 Lexus IS300h radiator cap

4557-3. Do-it-yourself maintenance
7
Maintenance and care
IS300h_EE(OM53D56E)
■12-volt battery
→P. 4 6 3
Engine compartment
Power control unit coolant reser-
voir ( →P. 4 6 0 )
Engine oil level dipstick (→ P. 4 5 6 )
Engine coolant reservoir (→ P. 4 6 0 )
Engine oil filler cap (→ P. 4 5 7 ) Fuse box (
→P. 4 9 1 )
Wa s h e r f l u i d t a n k ( →P. 4 6 2 )
Electric cooling fans
Condenser ( →P. 4 6 2 )
Power control unit coolant
radiator ( →P. 4 6 2 )
Engine coolant radiator (→ P. 4 6 2 )1
2
3
4
5
6
7
8
9
10

4617-3. Do-it-yourself maintenance
7
Maintenance and care
IS300h_EE(OM53D56E)
■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.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deionized water.
(Minimum temperature: -35 °C [-31 °F])
For more details about coolant, contact any authorized Lexus dealer or repairer, or
another duly qualified and equipped professional.
■If the coolant level drops within a short time of replenishing
Visually check the radiators, hoses, engine/power control unit coolant reservoir caps,
drain cock and water pump.
If you cannot find a leak, have any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional, test the cap and check for leaks in the cooling sys-
tem.
CAUTION
■When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps or water filler cap.
( → P. 5 74 )
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.

5748-2. Steps to take in an emergency
IS300h_EE(OM53D56E)
CAUTION
■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 hood, do not open the hood until the steam
has subsided. The engine compartment may be very hot.
●After the hybrid system has been turned off, check that the “READY” indicator is off.
When the hybrid system operating, the gasoline engine may automatically start, or
the cooling fan may suddenly operate even if the gasoline engine stops. Do not touch
or approach rotating parts such as the belt and fan, which may lead to fingers or
clothing (especially a tie, a scarf or a mu ffler) getting caught, resulting in serious
injury.
NOTICE
■When adding engine/power control unit coolant
Add coolant slowly after the hybrid system has cooled down sufficiently. Adding cool
coolant to a hot hybrid system too quickly can cause damage to the hybrid system.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust etc.).
●Do not use any coolant additive.
●Do not loosen the coolant reservoir caps or
water filler cap while the hybrid system and
radiator are hot.
High temperature steam or coolant could
spray out.

620Alphabetical index
IS300h_EE(OM53D56E)
Paddle shift switches .............................221
Parking assist sensors ......................... 276
Parking brake ......................................... 227
PCS (Pre-Crash Safety system) ............302
Function ..................................................302
PCS OFF switch ................................303
Warning light ....................................... 522
Personal lights ........................................ 426
Wattage................................................. 588
Pollen removal mode ........................... 418
Pop-up display .......................................... 117
Pop Up Hood ............................................ 56
Power control unit ...................................83
Power control unit coolant ...............460
Capacity ................................................ 583
Checking .............................................. 460
Preparing and checking before winter.................................................... 322
Power easy access system ................ 169
Power outlet............................................ 436
Power steering (Electric power steering system) ................................. 296
Warning light ....................................... 522 Power switch ............................................212
Power windows ...................................... 185
Door lock linked window operation.............................................. 187
Jam protection function ...................186
Operation ...............................................185
Window lock switch ..........................185
Pre-Crash Safety system (PCS) .... 302
Function.................................................. 302
PCS OFF switch................................ 303
Warning light........................................522
Radar cruise control (dynamic radar cruise control) ........................ 254
Radiator .................................................... 462
Radio.......................................................... 352
Rear Crossing Traffic Alert............... 310
Rear fog light .......................................... 236 Replacing light bulb ......................... 507
Switch ...................................................... 236
Rear passengers’ seat belt
reminder lights ................................... 523
Rear seat .................................................... 167
Fold down the seatback .................. 167
Luggage security system ................ 145
Rear personal lights............................. 426 Wattage ................................................ 588
Rear sunshade ....................................... 437 Operation ..............................................437
Reverse operation feature .............437
P
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