cooling LEXUS RC350 2018 Owners Manual

3014-5. Using the driving support systems
4
Driving
RC350_RC300 AWD_RC300_RC F_U(OM24748U)
RC350/RC300 (vehicles without Adapti ve Variable Suspension System)
Normal mode
Provides an optimal balance of fuel ec onomy, quietness, and dynamic perfor-
mance. Suitable for city driving.
Press the switch to change the driving mode to normal mode when Eco drive mode or
sport mode is selected.
Eco drive mode
Helps the driver accelerate in an eco-fr iendly manner and improve fuel econ-
omy through moderate throttle charact eristics and by controlling the opera-
tion of the air conditioning system (heating/cooling).
When not in Eco drive mode, if the driving mode select switch is turned to the left, the
Eco drive mode indicator will come on.
Sport mode
Controls the transmission and engine to provide quick, powerful acceleration.
This mode also changes the steering feel, making it suitable for when agile
driving response is desired, such as wh en driving on roads with many curves.
When not in sport mode, if the driving mode select switch is turned to the right, the
“SPORT” indicator will comes on.
Driving mode select switch
The driving modes can be selected to suit driving condition.
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3034-5. Using the driving support systems
4
Driving
RC350_RC300 AWD_RC300_RC F_U(OM24748U)
Eco drive mode
Helps the driver accelerate in an eco-fr iendly manner and improve fuel econ-
omy through moderate throttle charact eristics and by controlling the opera-
tion of the air conditioning system (heating/cooling).
When not in Eco drive mode, if the driving mode select switch is turned to the left, the
Eco drive mode indicator will come on.
Sport mode
•SPORT S mode
Controls the transmission and engine to provide quick, powerful accelera-
tion. This mode is suitable for when agile driving response is desired, such
as when driving on roads with many curves.
When not in SPORT S mode, if the driving mode select switch is turned to the
right, the “SPORT S” indicator will come on.
•SPORT S+ mode
Helps to ensure steering performanc e and driving stability by simultane-
ously controlling the steeri ng and suspension in addition to the transmis-
sion and engine. Suitable for sportier driving.
When in SPORT S mode, if the driving mode select switch is turned to the right,
the “SPORT S+” indicator will come on.
FunctionSetting
Powertrain
Normal
Power
Eco
ChassisNormal
Sport
Air conditioning systemNormal
Eco
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3054-5. Using the driving support systems
4
Driving
RC350_RC300 AWD_RC300_RC F_U(OM24748U)
Eco drive mode
Helps the driver accelerate in an eco-fr iendly manner and improve fuel econ-
omy through moderate throttle charact eristics and by controlling the opera-
tion of the air conditioning system (heating/cooling).
When not in Eco drive mode, if the driving mode select switch is turned to the left, the
Eco drive mode indicator will come on.
Sport mode
•SPORT S mode
Controls the transmission and engine to provide quick, powerful accelera-
tion. Also, gear shift timing is controlled to suit sporty driving, making this
mode is suitable for when agile drivin g response is desired, such as when
driving on roads with many curves.
When not in SPORT S mode, if the driving mode select switch is turned to the
right, the “SPORT S” indicator will come on.
•SPORT S+ mode
Provides earlier downshift timing than SPORT S mode in order to maintain
a high engine speed and provides faster gear changes. This mode also
changes the steering feel, suspension control and VDIM control, making it
suitable for powerful sporty driving.
When in SPORT S mode, if the driving mode select switch is turned to the right,
the “SPORT S+” indicator will come on.
FunctionSetting
Powertrain
Normal
Power
Eco
ChassisNormal
Sport
Air conditioning systemNormal
Eco
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3064-5. Using the driving support systems
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
■Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heating/cooling operations and fan speed of the air condi-
tioning system to enhance fuel efficiency ( P. 333). To improve air conditioning perfor-
mance, adjust the fan speed or turn off Eco drive mode.
■Automatic deactivation of sport mode and custom mode
If the engine switch is turned off after driving in sport mode or custom mode, the drive
mode will be changed to normal mode.
■Driving mode pop-up display (veh icles with a 10.3-inch display)
When the driving mode is changed, the sele cted driving mode will be temporarily dis-
played on the side display. ( P. 331)

3355-1. Using the air conditioning system
5
Interior features
RC350_RC300 AWD_RC300_RC F_U(OM24748U)
Display the air conditioning control
screen
Display the option control screen
(P. 335)
Adjust the left-hand side tempera-
ture setting
Adjust the fan speed setting
Select the air flow mode
Adjust the right-hand side temperature setting
Function on/off indicators
When the function is on, the indica tor illuminates on the control screen.
Display the sub function menu
Using the Remote Touch, select the button on the screen and activate it by press-
ing on or double tappin g the Remote Touch Pad.
■Option control screen
Select on the air conditioning contro l screen to display the option control
screen. The functions can be switched on and off.
Adjusting the temperature for driver
and passenger seats separately
(“DUAL” mode) ( P. 337)
Select to set eco mode on/off
( P. 342)
Set cooling and dehumidification
function on/off
If the “A/C” indicator is turned off, the
system will blow ambient temperature
air or heated air. Removing pollen from the air (Micro dust and pollen filter)
( P. 338)
Air conditioning control screen
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3365-1. Using the air conditioning system
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
■Sub function menu
When the sub function button on the
Remote Touch is pressed, the follow-
ing functions can be switched on and
off.
Set automatic mode on/off
( P. 337)
Turn the fan off
Set cooling and dehumidification
function on/off
If the “A/C” indicator is tu rned off, the system will blow ambient temperature air or
heated air.
Adjust the temperature for driver an d passenger seats separately (“DUAL”
mode) ( P. 337)
Select to set eco mode on/off ( P. 342)
■Side display (vehicle with a navigation system)
Adjust the left-hand side tem-
perature setting
Adjust the fan speed setting
Adjust the right-hand side tem-
perature setting
Set cooling and dehumidification
function on/off
If the “A/C” indicator is turned off, the
system will blow ambient tempera-
ture air or heated air.
Adjust the temperature for the driver ’s and front passenger’s seats sepa-
rately (“DUAL” mode) ( P. 337)
Select the air flow mode
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3415-1. Using the air conditioning system
5
Interior features
RC350_RC300 AWD_RC300_RC F_U(OM24748U)
■Registering air conditioning settings to elec tronic keys (vehicles with driving position
memory)
●Unlocking the vehicle using an electronic ke y and turning the engine switch to IGNI-
TION ON mode will recall that key's re gistered air conditioning settings.
●When the engine switch is turned off, the current air conditioning settings will automat-
ically be registered to the electronic key that was used to unlock the vehicle.
●The system may not operate correctly if more th an one electronic key is in the vicinity or
if the smart access system with push-button start is used to unlock a passenger door.
●The doors that can recall the air conditioning setting* when unlocked using the smart
access system with push-button start can be changed. For details, contact your Lexus
dealer.
*: The doors that can recall the driving posi tion memory are changed at the same time.
■Using automatic mode
Fan speed is adjusted automatically according to the temperature setting and the ambi-
ent conditions.
Therefore, the fan may stop for a while until wa rm or cool air is ready to flow immediately
after is pressed or “AUTO” is selected.
■Using the voice command system
Air conditioning system can be operated using voice commands. For details, refer to the
“NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.
■Fogging up of the windows
The windows will easily fog up when the hu midity in the vehicle is high. Turning
(“A/C”) on will dehumidify the air from the outlets and defog the windshield effectively.
●If you turn (“A/C”) off, the windows may fog up more easily.
●The windows may fog up if the recirculated air mode is used.
■Outside/recirculated air mode
●When driving on dusty roads such as tunnels or in heavy traffic, set the outside/recircu-
lated air mode button to the recirculated air mode. This is effective in preventing out-
side air from enteri ng the vehicle interior. During cooling operation, setting the
recirculated air mode will also cool the vehicle interior effectively.
●Outside/recirculated air mode may automa tically switch depending on the tempera-
ture setting or the inside temperature.
■When the outside temperature exceeds 75 F (24 C) and the air conditioning system
is on
●In order to reduce the air co nditioning power consumption, the air conditioning system
may switch to recirculated air mode automa tically. This may also reduce fuel consump-
tion.
●Recirculated air mode is selected as a defaul t mode when the engine switch is turned to
IGNITION ON mode.
●It is possible to switch to outside air mode at any time by pressing .

3425-1. Using the air conditioning system
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
■Automatic mode for air intake control
In automatic mode, the system detects ex haust gas and other pollutants and auto-
matically switches between outside air and recirculated air modes.
When the dehumidification function is off, and the fan is operating, turning automatic
mode on will activate the dehumidification function.
■Operation of the air conditioning system in Eco drive mode
In Eco drive mode, the air conditioning system is controlled as follows to prioritize fuel
efficiency:
●Engine speed and compressor operation controlled to restrict heating/cooling capac-
ity
●Fan speed restricted when automatic mode is selected
To improve air conditioning performanc e, perform the following operations:
●Adjust the fan speed
●Turn off Eco drive mode
■When the outside temperature falls to nearly 32 F (0 C)
The dehumidification function may not oper ate even when is pressed or “A/C” is
selected.
■Ventilation and air conditioning odors
●To let fresh air in, set the air conditioning system to the outside air mode.
●During use, various odors from inside and outside the vehicle may enter into and accu-
mulate in the air conditioning system. This may then cause odor to be emitted from the
vents.
●To reduce potential odors from occurring:
• It is recommended that the air conditioning system be set to outside air mode prior
to turning the vehicle off.
• The start timing of the blower may be dela yed for a short period of time immediately
after the air conditioning system is started in automatic mode.
■Air conditioning filter
P. 425
■Customization
Settings (e.g. A/C Auto switch operation) can be changed.
(Customizable features: P. 575)

3926-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
WARNING
The engine compartment contains many mechan isms and fluids that may move suddenly,
become hot, or become electrically energize d. To avoid death or serious injury, observe
the following precautions.
■When working on the engine compartment
●Keep hands, clothing and tools away from the moving fan and engine drive belt.
●Be careful not to touch the engine, radiator, exhaust manifold, etc. right after driving
as they may be hot. Oil and other 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 or the battery. Fuel and
battery fumes are flammable.
●Be extremely cautious when working on the battery. It contains poisonous and corro-
sive sulfuric acid.
■When working near the electric cooling fans or radiator grille
Be sure the engine switch is off.
With the engine switch in IGNITION ON mode, the electric cooling fans may auto-
matically start to run if the air conditioning is on and/or the coolant temperature is high.
(  P. 406)
■Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from getting in
your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner f ilter removed may cause excessive engine wear due to dirt
in the air.

3976-3. Do-it-yourself maintenance
RC350_RC300 AWD_RC3 00_RC F_U(OM24748U)
6
Maintenance and care
RC350/RC300 AWD
Engine compartment
Fuse boxes (P. 429)
Battery ( P. 408)
Engine oil level dipstick (P. 400)
Engine coolant reservoir (P. 404)
Engine oil filler cap ( P. 402) Brake fluid reservoir (
P. 407)
Washer fluid tank ( P. 411)
Electric cooling fans
Condenser ( P. 406)
Radiator ( P. 406)1
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