cooling LEXUS RC300 2016 User Guide

4877-3. Do-it-yourself maintenance
7
Maintenance and care
RC350_RC300_RC200t_RC F_U (OM24671U)
RC F
Fuse boxes (P. 5 1 9 )
Battery ( P. 4 9 7 )
Engine oil level dipstick (P. 4 8 8 )
Engine coolant reservoir (P. 4 9 3 )
Engine oil filler cap ( P. 4 9 0 ) Brake fluid reservoir (
P. 4 9 6 )
Wa s h e r f l u i d t a n k ( P. 5 0 0 )
Electric cooling fans
Condenser ( P. 4 9 5 )
Radiator ( P. 4 9 5 )1
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4947-3. Do-it-yourself maintenance
RC350_RC300_RC200t_RC F_U (OM24671U)
■Intercooler coolant reservoir (RC200t only)
The coolant level is satisfactory if it is between the “F” and “L” lines on the res-
ervoir when the engine 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. 6 0 8 )
■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 mixt ure of 50% coolant and 50% deionized water.
(Minimum temperature: -31 F [-35 C])
Canada:
“Toyota Super Long Life Coolant” is a mixt ure of 55% coolant and 45% deionized water.
(Minimum temperature: -44 F [-42 C])
For more details about engine coolant, contact your Lexus dealer.
■If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine and intercooler 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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4957-3. Do-it-yourself maintenance
7
Maintenance and care
RC350_RC300_RC200t_RC F_U (OM24671U)
Check the radiator, condenser and intercooler radiator and clear away any for-
eign objects.
If any of the above parts are extremely dirty or you are not sure of their condition,
have your vehicle inspected by your Lexus dealer.
WA R N I N G
■When the engine is hot (RC350/RC300/RC200t)
Do not remove the engine coolant reservoir cap, intercooler coolant reservoir cap and
radiator cap. ( P. 6 1 2 )
The cooling system may be under pressure and may spray hot coolant if the cap is
removed, causing serious injuries, such as burns.
■When the engine is hot (RC F)
Do not remove the engine coolant reservoir cap. ( P. 6 1 2 )
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 cool-
ing. 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, condenser and intercooler radiator (if equipped)
WA R N I N G
■When the engine is hot
Do not touch the radiator, condenser or intercooler as they may be hot and cause seri-
ous injuries, such as burns.

6078-2. Steps to take in an emergency
8
When trouble arises
RC350_RC300_RC200t_RC F_U (OM24671U)
WA R N I N G
■Avoiding battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable gas
that may be emitted from the battery:
●Make sure each jumper cable is connected to the correct terminal and that it is not
unintentionally in contact with any other than the intended terminal.
●Do not allow the other end of the jumper cable connected to the “+” terminal to come
into contact with any other parts or metal surfaces in the area, such as brackets or
unpainted metal.
●Do not allow the + and - clamps of the jump er cables to come into contact with each
other.
●Do not smoke, use matches, cigarette lighters or allow open flame near the battery.
■Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while related parts
contain lead and lead comp ounds. Observe the following precautions when handling
the battery:
●When working with the battery, always wear safety glasses and take care not to allow
any battery fluids (acid) to come into contact with skin, clothing or the vehicle body.
●Do not lean over the battery.
●In the event that battery fluid comes into contact with the skin or eyes, immediately
wash the affected area with water and seek medical attention.
Place a wet sponge or cloth over the affected area until medical attention can be
received.
●Always wash your hands after handling the battery support, terminals, and other bat-
tery-related parts.
●Do not allow children near the battery.
NOTICE
■When handling jumper cables
When connecting the jumper cables, ensure th at they do not become entangled in the
cooling fans or engine drive belt.

6098-2. Steps to take in an emergency
8
When trouble arises
RC350_RC300_RC200t_RC F_U (OM24671U)
After the engine 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.
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RC350/RC300RC200t
RC F

6118-2. Steps to take in an emergency
8
When trouble arises
RC350_RC300_RC200t_RC F_U (OM24671U)
Add coolant if necessary.
Water can be used in an emergency if coolant is unavailable.
Start the engine and turn the air conditioning 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 oper ating by checking the fan sound and air flow.
If it is difficult to check th ese, 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 and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
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Engine (RC350/RC300)Engine (RC200t)
Engine (RC F)Intercooler (RC200t)
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6138-2. Steps to take in an emergency
8
When trouble arises
RC350_RC300_RC200t_RC F_U (OM24671U)
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 additive.

6269-1. Specifications
RC350_RC300_RC200t_RC F_U (OM24671U)
■Spark plug
Cooling system
Capacity
RC350/
RC30010.1 qt. (9.6 L, 8.4 Imp. qt.)
RC200t
Gasoline engine
8.5 qt. (8.0 L, 7.0 Imp. qt.)
Intercooler
3.3 qt. (3.1 L, 2.7 Imp. qt.)
RC F12.3 qt. (11.6 L, 10.2 Imp. qt.)
Coolant type
Use either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-sili- cate, non-amine, non-nitrite, and non-borate coolant
with long-life hybrid organic acid technology
Do not use plain water alone.
Ignition system
RC350/RC300RC200tRC F
MakeDENSO
FK20HBR11NGK DILFR7K9GDENSO
FK20HBR-J8
Gap0.043 in. (1.1 mm)0.035 in. (0.9 mm)0.031 in. (0.8 mm)
NOTICE
■Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust the spark plug gap.
Electrical system
Battery
Open voltage at 68F
(20 C):12.6  12.8 V Fully charged
12.2
 12.4 V Half charged
11.8
 12.0 V Discharged
(Check the voltage 20 minutes after the engine and all
lights are turned off.)
Charging rates5 A max.

683Alphabetical index
RC350_RC300_RC200t_RC F_U (OM24671U)
Child safety ................................................ 56Airbag precautions .............................. 42
Battery precautions ............. 499, 607
Child restraint system ......................... 57
How your child should wear the seat belt .......................................... 36
Installing child restraints..................... 57
Moon roof precautions...................... 181
Power window lock switch .............174
Power window precautions ........... 177
Removed electronic key battery precautions................ 518
Seat belt extender precautions ........................................... 39
Seat belt precautions ..........................38
Seat heater precautions..................429
Trunk precautions............................... 146 Cleaning ....................................... 464, 469
Aluminum wheels .............................. 465
Exterior ................................................... 464
Interior ..................................................... 469
Seat belts................................................ 470
Clock......................................................... 440
Coat hooks ..............................................443
Compass ................................................... 451
Condenser .............................................. 495
Console box ........................................... 436
Cooling system ..................................... 493 Engine overheating ......................... 608
Cruise control Cruise control ..................................... 235
Dynamic radar cruise control ..... 239
Cup holders.............................................437
Current fuel consumption .........108, 110
Curtain shield airbags ........................... 40
Customizable features ........................ 651