2018 Lexus LC500h radiator

3667-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
If the engine coolant temperature
gauge enters the red zone or
“Engine Coolant Temp High Stop in
a Safe Place See Owner’s Manual”
is shown on the multi-information
display
1 Stop the vehicle in a safe place and
turn off the air conditioning system,
and then stop the hybrid system.
2 If you see steam:
Carefully lift the hood after the
steam subsides.
If you do not see steam:
Carefully lift the hood.
WARNING
●Keep hands and clothing (especially a
tie, a scarf or a muffler) away from the
fan and belts. Failure to do so may
cause the hands or clothing to be
caught, resulting in serious injury.
●While the engine and radiator are hot,
do not loosen or remove the coolant
reservoir cap.
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 sys-
tem
Observe the following precautions:
●Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
●Do not use any coolant additive.
If your vehicle overheats
(LC500h)
The following may indicate that
your vehicle is overheating.
 The engine coolant temperature
gauge ( P.74) is in the red zone
or a loss of hybrid system power is
experienced. (For example, the
vehicle speed does not increase.)
 “Engine Coolant Temp High Stop
in a Safe Place See Owner’s
Manual” or “Hybrid System
Overheated Reduced Output
Power” is shown on the multi-
information display.
 Steam comes out from under the
hood.
Correction procedures

3677-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
7
When trouble arises
3 After the hybrid system has cooled
down sufficiently, inspect the hoses
and cooling system for leaks.
Radiator
Cooling fan
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4The coolant level is satisfactory if it
is between the “F” and “L” lines on
the reservoir.
Reservoir
“F”
“L”
Coolant inlet cap
5 Add coolant if necessary.
Water can be used in an emergency if engine coolant is unavailable.
6
Start the hybrid system and turn the
air conditioning system on to check
that the radiator cooling fan oper-
ates and to check for coolant leaks
from the radiator or hoses.
The fan operates when the air conditioning
system is turned on immediately after a
cold start. Confirm that the fan is operating
by checking the fan sound and air flow. If it
is difficult to check these, turn the air con-
ditioning system on and off repeatedly.
(The fan may not oper ate in freezing tem-
peratures.)
7 If the fan is not operating:
Stop the hybrid system immediately
and contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the
nearest Lexus dealer.
If “Hybrid System Overheated
Reduced Output Power” is shown
on the multi-information display
1 Stop the vehicle in a safe place.
2 Stop the hybrid system and care-
fully lift the hood.
A
B
A
B
C
D

3687-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
3After the hybrid system has cooled
down, inspect the hoses and radia-
tor core (radiator) for any leaks.
Radiator
Cooling fan
If a large amount of coolant leaks, immedi-
ately contact your Lexus dealer.
4The coolant level is satisfactory if it
is between the “F”/“FULL” and
“L”/“LOW” lines on the reservoir.
Reservoir
“F”/“FULL”
“L”/“LOW”
5 Add coolant if necessary.
Water can be used in an emergency if power control unit coolant is unavailable.
6
After stopping the hybrid system
and waiting for 5 minutes or more,
start the hybrid system again and
check if “Hybrid System Over-
heated Reduced Output Power” is
shown on 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:
The hybrid system temperature has
dropped and the vehicle may be driven
normally.
However, if the message appears again fre-
quently, contact your Lexus dealer.
■When adding engine coolant
Add coolant in accordance with the follow-
ing procedure.
1 Remove the service cover.
2 Remove the engine cover.
A
B
A
B
C

3697-2. Steps to take in an emergency
LC500_LC500h_OM_OM11405U_(U)
7
When trouble arises
3 Remove the caps and .
4 Add coolant through the inlet of the cap
up to the “F” line , and then
replace the cap .
5 Add coolant through the inlet of the cap
until it is full, and then replace the
cap .
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
hood, do not open the hood until the
steam has subsided. The engine com-
partment may be very hot.
AB
BC
B
A
A
●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 rotat-
ing parts such as the fan, which may
lead to fingers or clothing (especially a
tie, a scarf or a muffler) getting caught,
resulting in serious injury.
●Do not loosen the coolant inlet cap or
the coolant reservoir caps while the
hybrid system and radiator are hot.
High temperature steam or coolant
could spray out.
NOTICE
■When adding engine/power control
unit coolant
Add coolant slowly after the hybrid sys-
tem has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too
quickly can cause dama ge to the hybrid
system.
■To prevent damage to the cooling sys-
tem
Observe the following precautions:
●Avoid contaminating the coolant with
foreign matter (such as sand or dust
etc.).
●Do not use any coolant additive.

427What to do if... (Troubleshooting)
LC500_LC500h_OM_OM11405U_(U)Alphabetical index427
Indicator .........................................................338
Operation........................................................ 162
Parking brake engaged warning buzzer ...........................................................................164
Warning message.......................................164
Parking lights ................................................... 167 Light switch ..................................................... 167
Replacing light bulbs................................ 324
PCS (Pre-Collision System) .................... 184 Function ........................................................... 184
PCS OFF switch ......................................... 186
Warning light ............................................... 336
Warning message...................................... 190
Personal lights............................................... 252
Pop-up display ..................................................76
Pop Up Hood................................................... 36
Power control unit...........................................57
Power control unit coolant ...................... 295 Capacity ......................................................... 376
Checking ....................................................... 295
Preparing and checking before winter......................................................................... 233
Power outlet .................................................. 258
Power steering (Elect ric power steering
system)...........................................................227 Warning light ...............................................335
Warning message..................................... 345
Power switch (engine switch) ....... 140, 143 Auto power off function ................ 143, 146
Changing the power switch (engine switch) modes..................................142, 146
If your vehicle has to be stopped in an
emergency ................................................ 326
Starting the hybrid system (engine) 140, 143
Power windows ..............................................125 Door lock linked window operation.. 126
Jam protection function............................ 126
Operation........................................................125
Window lock switch .................................. 126
Pre-Collision System (PCS) .................... 184 Function ........................................................... 184 PCS OFF switch ......................................... 186
Warning light ...............................................336
Warning message ...................................... 190
R
Radar cruise control (dynamic radar cruise
control with full-speed range).............. 198
Radiator ........................................................... 296
Rear side marker lights ............................... 167 Light switch .....................................................167
Replacing light bulbs ................................ 324
Rear turn signal lights ................................... 161 Replacing light bulbs ................................ 324
Turn signal lever ............................................ 161
Rear view mirror Inside rear view mirror .............................. 122
Outside rear view mirrors.......................123
Rear window defogger ............................. 243
Refueling ........................................................... 176 Capacity ......................................................... 373
Fuel types ....................................................... 373
If the fuel filler do or cannot be opened
..........................................................................354
Opening the fuel tank cap ......................176
Regenerative braking ................................... 55
Remote Touch .............................................. 236
Replacing Electronic key battery ............................... 318
Fuses.................................................................. 319
Light bulbs ..................................................... 324
Tires ................................................................. 309
Resetting the message indicating mainte- nance is required ...................................... 282
Rev indicator .................................................... 75
Rev peak..............................................................76
Run-flat tires....................................... 303, 350
S
Seat belt reminder light............................. 339
Seat belts............................................................ 24 Automatic Locking Retractor................. 26