2017 LEXUS LS600H coolant temperature

6117-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
●The needle of the engine coolant temperature gauge ( P. 115) enters
the red zone or a loss of hybrid system power is experienced. (For
example, the vehicle speed does not increase.)
●“Hybrid System Overheat” is shown on the multi-information display.
●Steam comes out from under the hood.
■If the needle of the engine cool ant temperature gauge enters the red
zone
Stop the vehicle in a safe place and turn off the air conditioning sys-
tem, and then stop the hybrid system.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the hybrid system has
cooled down sufficiently,
inspect the hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact any
authorized Lexus dealer or
repairer, or anot her duly quali-
fied and equipped professional.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
1
2
3
1
2

6137-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fan operates 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 conditioning system on
and off repeatedly.
(The fan may not operate in freezing temperatures.)
If the fan is not operating:
Stop the hybrid system immediat ely and contact any authorized
Lexus dealer or repairer, or another duly qualified and equipped pro-
fessional.
If the fan is operating:
Have the vehicle inspected at the nearest any authorized Lexus
dealer or repairer, or another duly qualified and equipped profes-
sional.
■If “Hybrid System Overheat” is shown on the multi-information dis-
play
Stop the vehicle in a safe place.
Stop the hybrid system an d carefully lift the hood.
After the hybrid system has
cooled down, inspect the
hoses and radiator core (radia-
tor) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact any
authorized Lexus dealer or
repairer, or anot her duly quali-
fied and equipped professional.
6
7
1
2
3
1
2

6157-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
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.
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
while the hybrid system and radiator are
hot.
High temperature steam or coolant could
spray out.

660Alphabetical index
LS600h/LS600hL_EE(OM50G20E)
Engine compartment cover .............493
Engine coolant .......................................498
Capacity ................................................. 627
Checking .............................................. 498
Preparing and checking
before winter ....................................384
Engine coolant temperature
gauge.........................................................115
Engine oil.................................................. 495
Capacity ................................................. 624
Checking ...............................................495
Preparing and checking
before winter ....................................384
Engine switch ......................................... 247
EPS (Electric Power Steering)........339
Function ..................................................339
Warning light ....................................... 557
EV drive mode ....................................... 252
First-aid kit storage belt ..................... 444
Flat tire
Vehicles with a spare tire .............. 567
Vehicles without a spare tire ....... 578
Floor mats ................................................... 40
Fluid
Brake ....................................................... 630
Hybrid transmission ......................... 628
Washer.....................................................501
Fog lights .................................................. 280
Replacing light bulbs ........... 542, 543
Switch ...................................................... 280
Wattage ................................................... 631
Follow me home system .................... 270
Footwell light ...........................................427
Front automatic air
conditioning system ......................... 399
Front fog lights ....................................... 280
Replacing light bulbs ....................... 543
Switch ...................................................... 280
Front position lights ............................. 269
Light switch........................................... 269
Replacing light bulbs ....................... 543
Welcome light illumination
control ...................................................150
F