2015 LEXUS LS600H cooling

3915-6. Other interior features
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Interior features
LS600hL_U(OM50E41U)
CAUTION
■Burns/excessive cooling
●Use caution when seating the following persons in a seat to avoid the possibility of
burns or excessive cooling:
• Babies, small children, elderly persons, sick persons and persons with a physi-
cal disability
• Persons who have sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs which induce sleep, such as sleeping drugs and cold remedies
●Do not cover the seat with anything when using the climate control seat. Using
the climate control seat with a blanket or cushion may increase or decrease the
temperature of the seat, resulting in overheating or overcooling.
●Do not use the climate control seat more than necessary. Doing so may cool the
occupants excessively or may cause minor burns or overheating.
NOTICE
■To prevent damage to the climate control seat
Do not put heavy objects that have an unev en surface on the seat and do not stick
sharp objects, such as needle s and nails, into the seat.
■To prevent the 12-volt battery from being discharged
Do not leave the system on longer than necessary when the hybrid system is off.

4346-3. Do-it-yourself maintenance
LS600hL_U(OM50E41U)
Radiator and condenser (P. 4 4 7 )
Tire inflation pressure ( P. 464)• Tire pressure gauge
• Compressed air source
Wa s h e r f l u i d ( P. 4 4 9 )
• Water or washer fluid containing anti-
freeze (for winter use)
• Funnel (used only for adding water or washer fluid)
CAUTION
The engine compartment contains many me chanisms and fluids that may move sud-
denly, become hot, or become electrically energized. To avoid death or serious
injury, observe the following precautions.
■When working on the engine compartment
●Make sure that the indicator on the power switch and the “READY” indicator are
both off.
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, power control unit, radiator, exhaust manifold,
etc. right after driving as they may be hot. Oil and ot her fluids may also be hot.
●Do not leave anything that may burn easily, such as paper and rags, in the engine
compartment.
●Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes are flam-
mable.
■When working near the electric cooling fans or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fans may automatically
start to run if the air conditioning is on and/or the coolant temperature is high.
(  P. 4 4 7 )
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from get-
ting in your eyes.
ItemsPa r t s a n d t o o l s

4396-3. Do-it-yourself maintenance
6
Maintenance and care
LS600hL_U(OM50E41U)
■12-volt battery
P. 4 5 0
Engine compartment
Power control unit coolant res-
ervoir ( P. 446)
Engine oil level dipstick (P. 4 4 2 )
Engine oil filler cap ( P. 443)
Brake fluid reservoir (P. 4 4 8 )
Fuse boxes ( P. 4 74 ) Washer fluid tank (
P. 449)
Power control unit coolant radi-
ator ( P. 4 4 7 )
Electric cooling fans
Condenser ( P. 4 4 7 )
Engine coolant radiator (P. 4 4 7 )
Engine coolant reservoir (P. 445)1
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4466-3. Do-it-yourself maintenance
LS600hL_U(OM50E41U)
■Power control unit coolant reservoir
The coolant level is satisfactory if it is between the “F” and “L” lines on
the reservoir when the hybrid system is cold.
Reservoir cap
“F” line
“L” line
If the level is on or below the “L”
line, add coolant up to the “F” line.
( P. 5 3 0 )
■Coolant selection
Only use “Toyota Super Long Life Coolant” or a similar high quality ethylene glycol
based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life
hybrid organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deionized
water. (Minimum temperature: -31 F [-35C])
Canada:
“Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deionized
water. (Minimum temperature: -44 F [-42C])
For more details about coolant, contact your Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine/power control unit coolant reservoir caps,
drain cock and water pump.
If you cannot find a leak, have your Lexus dealer test the cap and check for leaks in
the cooling system.
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4476-3. Do-it-yourself maintenance
6
Maintenance and care
LS600hL_U(OM50E41U)
Check the radiator and condenser and clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of their
condition, have your vehicle inspected by your Lexus dealer.
CAUTION
■When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps.(P. 5 3 4 )
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor straight antifreeze. The correct mixture of water
and antifreeze must be used to provide proper lubrication, corrosion protection
and cooling. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or paint.
Radiator and condenser
CAUTION
■When the hybrid system is hot
Do not touch the radiator or condenser as they may be hot and cause serious inju-
ries, such as burns.

5307-2. Steps to take in an emergency
LS600hL_U(OM50E41U)●
The needle of the engine
coolant temperature gauge ( P. 99) 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 coolant temperature gauge enters the red
zone
Stop the vehicle in a safe place an d 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 your
Lexus dealer.
If your vehicle overheats
The following may indicate that your vehicle is overheating.
Correction procedures
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5327-2. Steps to take in an emergency
LS600hL_U(OM50E41U)
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 immediately and contact your Lexus dealer.
If the fan is operating:
Have the vehicle inspected at the nearest Lexus dealer.
■If “Hybrid System Overheat” is shown on the multi-information dis-
play
Stop the vehicle in a safe place.
Stop the hybrid system and 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 your
Lexus dealer.
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5347-2. Steps to take in an emergency
LS600hL_U(OM50E41U)
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 oper ate 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 syst em has cooled down sufficiently. Adding
cool coolant to a hot hybrid system too quickly can cause da mage 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.