2015 Lexus ES300h radiator cap

545
ES350_300h_OM_OM33B36U_(U)
7-3. Do-it-yourself maintenance
7
Maintenance and care
Engine compartment
XGasoline vehicles (2GR-FE engine)
Washer fluid tank (→P. 561)
Engine oil filler cap (→P. 5 5 0 )
Engine oil level dipstick (→P. 548)
Engine coolant reservoir (→P. 553) Brake fluid reservoir
(→P. 5 5 6 )
Fuse box ( →P. 586)
12-volt battery ( →P. 5 5 7 )
Electric cooling fans
Condenser ( →P. 555)
Radiator ( →P. 555)1
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4
5
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546
ES350_300h_OM_OM33B36U_(U)
7-3. Do-it-yourself maintenance
XHybrid vehicles (2AR-FXE engine)
■12-volt battery (hybrid vehicles)
→P. 5 6 2
Washer fluid tank ( →P. 561)
Fuse boxes ( →P. 586)
Power control unit coolant
reservoir ( →P. 553)
Engine oil level dipstick (→P. 548)
Engine oil filler cap (→P. 5 5 0 ) Engine coolant reservoir
(→P. 553)
Brake fluid reservoir (→P. 5 5 6 )
Power control unit coolant
radiator ( →P. 555)
Electric cooling fans
Condenser ( →P. 555)
Engine coolant radiator (→P. 555)1
2
3
4
5
6
7
8
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554
ES350_300h_OM_OM33B36U_(U)
7-3. Do-it-yourself maintenance
■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 mixture of 50% coolant and 50% deionized
water. (Minimum temperature: -31 °F [-35 °C])
Canada:
“Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deionized
water. (Minimum temperature: -44 °F [-42 °C])
For more details about coolant, contact your Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine/power control unit coolant reservoir caps,
drain cock and water pump.
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in
the cooling system.
CAUTION
■When the engine is hot
Do not remove the engine/power control unit coolant reservoir cap or the radiator
cap.
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 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 from damaging parts or paint.

6898-2. Steps to take in an emergency
ES350_300h_OM_OM33B36U_(U)
8
When trouble arises
The coolant level is satisfactory if it is between the “FULL” and “LOW”
line on the reservoir.Reservoir
“FULL”
“LOW”
Radiator cap
Add coolant if necessary.
Water can be used in an emergency if
coolant is unavailable.
Start the engine and turn the air conditioning system on to check that
the radiator cooling fans operate and to check for coolant leaks from
the radiator or hoses.
The fans operate when the air conditioning system is turned on immediately after
a cold start. Confirm that the fans are operating by checking the fan sound and air
flow. If it is difficult to check these, turn the air conditioning system on and off
repeatedly. (The fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately an d contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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5
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6908-2. Steps to take in an emergency
ES350_300h_OM_OM33B36U_(U)
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.
●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 serious injury.
●Do not loosen the radiator cap or the coolant reservoir cap while the engine and
radiator are hot. High temperature steam or coolant could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the engine has cooled 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 foreign matter (such as sand or dust etc.).
●Do not use any coolant additives.

6928-2. Steps to take in an emergency
ES350_300h_OM_OM33B36U_(U)
After the hybrid system has cooled down sufficiently, inspect the
hoses and cooling system for leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact your
Lexus dealer.
The coolant level is satisfactory if it is between the “FULL” and
“LOW” line on the reservoir.Reservoir
“FULL”
“LOW”
Radiator cap
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
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1
2
4
1
2
3
4
5

6958-2. Steps to take in an emergency
ES350_300h_OM_OM33B36U_(U)
8
When trouble arises
Start the hybrid system and check for the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the nearest Lexus dealer.
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 indicator on the
“POWER” switch and the “READY” indicator are off.
When the hybrid system is 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 fan, which may lead to fin-
gers or clothing (especially a tie, a scarf or a muffler) getting caught, resulting in
serious injury.
●Do not loosen the radiator cap or the coolant reservoir cap while the hybrid sys-
tem and radiator are hot. High temperature steam or coolant could spray out.
6

776Alphabetical index
ES350_300h_OM_OM33B36U_(U)
Parking assist sensors (intuitive parking assist) ................... 281
Parking brake
Operation ................................................231
Parking brake engaged warning buzzer ...............................643
Parking brake engaged
warning message ...........................643
Parking lights
Light switch ........................................... 233
Replacing light bulbs ......................... 610
Welcome light illumination control ..........................127
PCS (Pre-Collision System) Function ....................................................321
PCS OFF switch ................................ 322
Warning light ...................................... 628
Warning message ...................... 638, 646, 651
Personal lights........................................480
Power control unit ................................... 77
Power control unit coolant Capacity .................................................707
Checking............................................... 553
Preparing and checking
before winter ..................................... 341
Radiator ................................................. 555
Power easy access system ................ 159
Power outlets ......................................... 492
Power steering (Electric Power Steering system) ..................................314
Warning light ...................................... 628
Warning message ............................ 639
“POWER” switch ................................... 212 Power trunk opener and closer ....... 149
Power windows
Door lock linked window operation ........................... 179
Jam protection function....................178
Operation................................................ 177
Window lock switch .......................... 177
Pre-Collision System (PCS)
Function .................................................... 321
PCS OFF switch ................................ 322
Warning light ....................................... 628
Warning message.......................638, 646, 651
Radar cruise control (dynamic radar cruise control)........................ 258
Radiator.................................................... 555
Radio
*...................................................... 378
RCTA (Rear Cross
Traffic Alert)........................................ 328
Rear personal lights ............................ 480
Rear side marker lights Light switch........................................... 233
Replacing light bulbs ........................ 610
Welcome light
illumination control.......................... 127
Rear door sunshades.......................... 495
Rear sunshade Operation.............................................. 495
Reverse operation feature ............ 496
P
R