2014 Lexus ES300h coolant temperature

8237-2. Steps to take in an emergency
ES350_300h_OM_OM33A60U_(U)
7
When trouble arises
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.

824
ES350_300h_OM_OM33A60U_(U)
7-2. Steps to take in an emergency
If your vehicle overheats (hybrid vehicles)
■If the needle of the engine coolant 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 cooling system for leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact your
Lexus dealer.
The following may indicate that your vehicle is overheating.
●The needle of the engine coolant temperature gauge ( →P. 9 5 )
enters the red zone or a loss of hybrid system power is experienced.
(For example, the vehicle speed does not increase.)
●“Hybrid System Overheat” ( →P. 780) is shown on the multi-informa-
tion display.
●Steam comes out from under the hood.
Correction procedures
1
2
3
1
2

8277-2. Steps to take in an emergency
ES350_300h_OM_OM33A60U_(U)
7
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.
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 additives.
6

902Alphabetical index
ES350_300h_OM_OM33A60U_(U)
Emergency, in case ofIf a warning buzzer
sounds..................................................759
If a warning light turns on...............759
If a warning message is displayed ........................................769
If the 12-volt battery is discharged ................................813, 817
If the electronic key does not operate properly .........810
If the engine will not start............... 805
If the hybrid system will not start ............................................... 807
If the shift lever
cannot be shifted from P ........... 809
If you have a flat tire .......................... 792
If you think something is wrong............................................... 757
If your vehicle becomes stuck ..................................................... 828
If your vehicle has to be stopped in an emergency .......... 749
If your vehicle needs to be towed ........................................ 751
If your vehicle overheats ..... 821, 824
Emergency flashers ............................. 748
Energy monitor ........................................ 112 Engine
Accessory mode ............................... 202
Compartment ...................................... 681
Engine switch ........................... 201, 208
Hood........................................................ 677
How to start the engine....................201
How to start the hybrid system ..................................................208
Identification number .......................834
If the engine will not start .............. 805
Ignition switch (“POWER” switch)..................................................208
Ignition switch (“START STOP ENGINE” switch) ...........................201
Overheating.............................. 821, 824
“Power” switch. ...................................208
“START STOP ENGINE” switch .....................................................201
Engine compartment cover............. 683
Engine coolant Capacity .................................................839
Checking .............................................. 689
Preparing and checking before winter ....................................330
Engine coolant temperature gauge ........................................................ 95
Engine immobilizer system ................. 82
Engine oil Capacity ................................................. 837
Checking ...............................................684
Oil level warning message ............ 777
Oil pressure warning message........................... 770
Preparing and checking
before winter ....................................330