cooling LEXUS RX450h 2015 Owner's Manual

7905-2. Steps to take in an emergency
If the fans are not operating:
Stop the hybrid system immediately and contact your Lexus
dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
■ If “HYBRID SYSTEM OVERHEAT” is shown on the multi-informa-
tion display
Stop the vehicle in a safe place. Ensure that the opening for the oil
cooler is not blocked by dirt or any
other foreign substance. If the
opening is not blocked or if the
message does not disappear after
some time the opening has been
cleaned, proceed to STEP 2.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has cooled
down, inspect the hoses and radia-
tor core (radiator) for any 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”
lines on the reservoir.
Reservoir
“FULL” line
“LOW” lineSTEP 7
STEP 1
STEP 2
STEP 3
STEP 4

5
When trouble arises
7915-2. Steps to take in an emergency
Add coolant if necessary. Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and check for the multi-information dis-
play.
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.STEP 5
CAUTION■
To prevent an accident or injury when in specting 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 compartm ent may be very hot, causing serious
injuries such as burns.●
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 fans may suddenly operate even if the gasoline engine stops.
Do not touch or approach rotating parts such as the fans, 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 while the hybrid system and radiator are hot.
Serious injuries, such as burns, may re sult from hot coolant and steam released
under pressure. STEP 6

7925-2. Steps to take in an emergency
NOTICE■
When adding engine/power control unit coolant
Wait until the hybrid system has cooled down before adding engine/power control
unit coolant.
When adding coolant, do so slowly. 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 foreig n matter (such as sand or dust etc.).●
Do not use any coolant additives.

8046-1. Specifications
Cooling system
* : With towing package
Ignition systemCapacity
Gasoline engine
Power control unit 12.0 qt. (11.4 L, 10.0 Imp. qt.)
12.4 qt. (11.7 L, 10.3 Imp. qt.)*
1.9 qt. (1.8 L, 1.6 Imp. qt.)
Coolant type Use either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-sili-
cate, non-amine, non-nitrite, and non-borate cool-
ant with long-life hybrid organic acid technology
Do not use plain water alone.
Spark plug
Make
Gap DENSO FK20HR11
0.043 in. (1.1 mm)
NOTICE■
Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.

862Alphabetical index
Card key ....................................................... 51
Care
Exterior ................................................... 634
Interior ..................................................... 637
Seat belts................................................638
Cargo capacity ....................................... 301
Cargo hooks ............................................ 612
CD changer
CD ...............................................380, 485
MP3 .............................................. 381, 493
WMA disc.................................. 381, 493
CD player ................................... 380, 485
Chains .......................................................302
Child restraint system
Booster seats, definition .................. 150
Booster seats, installation ................154
Convertible seats, definition ......... 150
Convertible seats, installation........154
Front passenger occupant
classification system........................145
Infant seats, definition........................ 150
Infant seats, installation ......................154
Installing CRS with LATCH
system ................................................... 155
Installing CRS with seat belts......... 157
Installing CRS with top tether
straps ....................................................... 161
Child safety
Airbag precautions............................ 140
Back door prec autions......................80
Child restraint system....................... 150
Child-protectors ....................................73
How your child should wear
the seat belt .......................................... 101
Installing child restraints ...................154 Moon roof precautions ......................118
Power window lock switch .............. 112
Power window precautions............. 114
Removed electron ic key battery
precautions .......................................688
Seat belt extender precautions .... 104
Seat belt precautions......................... 102
Seat heater precautions................. 605
12-volt battery
precautions ...........................668, 784
Child-protectors...................................... 73
Cleaning
Exterior ................................................... 634
Interior......................................................637
Seat belts ............................................... 638
Clock* ....................................................... 597
Coat hooks..............................................608
Coin holder ............................................. 592
Compass .................................................. 622
Condenser ................................................661
Console box ...........................................590
Coolant
Engine coolant.................................... 659
Power control unit coolant........... 659
Cooling system
Hybrid system ov erheating.......... 788
Cornering assist sensors ................... 248
Cruise control
Cruise control ...................................... 232
Dynamic radar cruise control ......236
Cup holders ............................................588
Curtain shield airbags ..........................132
Customizable features ....................... 825C