2018 LEXUS RCF radiator

5277-2. Steps to take in an emergency
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 7
When trouble arises After the engine has cooled down suff iciently, inspect th e hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans If a large amount of coolant leaks, immediately contact your Lexus dealer. 3
1
2
RC350/RC300 AWD 
RC300
RC F

5297-2. Steps to take in an emergency
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U) 7
When trouble arises Add coolant if necessary. Water can be used in an emerge ncy if coolant is unavailable.
Start the engine and turn the air conditio ning system on to check that the radi-
ator 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 fan 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. 5 
Engine (RC350/RC300 AWD) 
Engine (RC300)
Engine (RC F) 
Intercooler (RC300)
6
7

530 7-2. Steps to take in an emergency
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)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. ●
RC350/RC300 AWD: While the engine
and radiator are hot, do not loosen or remove
the coolant reservoir cap or coolant inlet cap.
(The coolant inlet cap is located under the
engine cover.)
High temperature steam or coolant could
spray out. ●
RC300: While the engine and radiators are
hot, do not loosen or remove the coolant res-
ervoir cap, coolant inlet cap, or intercooler
coolant reservoir cap.
High temperature steam or coolant could
spray out.
●
RC F: While the engine and radiator are hot,
do not loosen or remove the coolant reser-
voir cap.
High temperature steam or coolant could
spray out.

628 Alphabetical index
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)Radar cruise control (dynamic
radar cruise control) ........................ 268
Radiator .................................................... 406
Rear seats ..................................................164
Fold down the seatback .................. 164
Luggage security system ................ 152
Rear turn signal lights ........................... 221
Replacing light bulbs ........................ 432
Turn signal lever ................................... 221
Wattage ................................................. 553
Rear view mirror
Inside rear view mirror ......................176
Outside rear view mirrors .............. 178
Rear window defogger ...................... 338
Refueling .................................................... 241
Capacity ................................................ 540
Fuel types .............................................. 540
If the fuel filler door
cannot be opened ......................... 243
Opening the fuel tank cap............. 243
Remote Touch
* Replacing
Electronic key battery ...................... 427
Fuses.........................................................429
Light bulbs ............................................. 432
Tires ......................................................... 489
Reporting safety defects
for U.S. owners...................................600
Resetting the message indicating
maintenance is required ................385
Rev indicator ..................................... 93, 99
Rev peak ...........................................93, 100 Seat belt reminder light ..................... 455
Seat belts .....................................................34
Automatic Locking Retractor ........ 36
Child restraint system
installation ............................................. 58
Cleaning and maintaining
the seat belt ....................................... 382
Emergency Locking
Retractor................................................ 36
How to wear your seat belt............. 34
How your child should wear
the seat belt .......................................... 36
Pregnant women, proper
seat belt use ..........................................37
Reminder light and buzzer ...........455
Seat belt extender ................................ 36
Seat belt guide ....................................... 35
Seat belt pretensioners...................... 35
SRS warning light .............................. 453R S