2019 LEXUS RX350 heating

382 4-5. Using the driving support systems
RX350/RX350L_U ■
Automatic reactivation of TRAC, Tr ailer Sway Control and VSC systems
After turning the TRAC, Trailer Sway Contro l and VSC systems off, the systems will be
automatically re-enabled in the following situations: ●
When the engine swit ch is turned off●
If only the TRAC system is turned off, the TRAC will turn on when vehicle speed
increases
If both the TRAC and VSC systems are turned off, au tomatic re-enabling will not
occur when vehicle speed increases. ■
Reduced effectiveness of the EPS system
The effectiveness of the EPS system is reduced to prevent the system from overheating
when there is frequent steering input over an extended period of time. The steering
wheel may feel heavy as a result . Should this occur, refrain from excessive steering input
or stop the vehicle and turn the engine off. The EPS system should return to normal
within 10 minutes.
WARNING ■
The ABS does not operate effectively when ●
The limits of tire gripping performance have been exceeded (such as excessively
worn tires on a snow covered road). ●
The vehicle hydroplanes while driving at high speed on wet or slick roads.■
Stopping distance when the ABS is operating may exceed that of normal conditions
The ABS is not designed to shorten the vehi cle’s stopping distance . Always maintain a
safe distance from the vehicle in front of you, especially in the following situations: ●
When driving on dirt, grav el or snow-covered roads●
When driving with tire chains ●
When driving over bumps on the road ●
When driving over roads with potholes or uneven surfaces■
TRAC/VSC may not operate effectively when
Directional control an d power may not be achievable wh ile driving on slippery road
surfaces, even if the TRAC/VSC system is op erating. Drive the vehi cle carefully in con-
ditions where stability and power may be lost.

516 6-2. Using the air conditio ning system and defogger
RX350/RX350L_U ■
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 automatically.
This may also reduce fuel consumption. ●
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 the outside/recircu-
lated air mode button. ■
Automatic mode for air intake control (if equipped)
In automatic mode, the system detects exhaust gas and other pollutants and automati-
cally 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. ■
Fogging up of the windows ●
The windows will easily fog up when the humidity in the vehicle is high. Selecting “A/C”
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 is low
The dehumidification function may not operate even when “A/C” is selected. ■
Operation of the air conditioning system in Eco drive mode ●
In the Eco drive mode, the air conditioning sy stem is controlled as follows to prioritize
fuel efficiency
• Engine speed and compressor operation controlled to restrict heating/cooling
capacity
• 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

5216-2. Using the air conditioning system and defogger
6
Interior features
RX350/RX350L_UHeated steering wheel 
/seat heaters 
/seat ventila-
tors 
 : If equippedHeated steering wheel and seat heaters heat the side grips of the steering
wheel and seats, respectively. Seat vent ilators maintain good ventilation using
a fan built into the seats. WARNING ●
Care should be taken to prevent injury if anyone in the following categories comes in
contact with the steering wheel and seats when the heater is on:
• Babies, small children, the elderly, the sick and the ph ysically challenged
• Persons with sensitive skin
• Persons who are fatigued
• Persons who have taken alcohol or drugs that induce sleep (sleeping drugs, cold
remedies, etc.) ●
Observe the following precautions to prevent minor burns or overheating:
• Do not cover the seat with a blanket or cushion when using the seat heater.
• Do not use seat heater more than necessary.
NOTICE ●
Do not put heavy objects that have an unev en surface on the seat and do not stick
sharp objects (needles, nails, etc.) into the seat. ●
To prevent battery discharge, do not us e the functions when the engine is off.

692 8-2. Steps to take in an emergency
RX350/RX350L_U Stop the vehicle in a safe place and tu rn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down
sufficiently, insp ect the hoses and
radiator core (radiator) for any
leaks.
Radiator
Cooling fans If a large amount of coolant leaks,
immediately contact your Lexus
dealer.
The coolant level is satisfactory if it is
between the “FULL” and “LOW”
lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Radiator capIf your vehicle overheats The following may indicate that your vehicle is overheating. ●
The needle of the engine coolant temperature gauge (  P. 86) enters the
red zone, or a loss of engine power is experienced. (For example, the vehi-
cle speed does not increase.) ●
“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display. ●
Steam comes out from under the hood.
Correction procedures 1
2
3
1
2
4
1
2
3
4

760 Alphabetical index
RX350/RX350L_U Child-protectors..................................... 127
Cleaning......................................... 576, 581
Aluminum wheels .............................. 577
Exterior....................................................576
Interior ...................................................... 581
Seat belts ............................................... 582
Clock .................................................86, 544
Coat hooks.............................................. 556
Compass .................................................. 564
Condenser .............................................. 599
Console box ...........................................530
Consumption screen ..................... 94, 114 Coolant
Capacity................................................. 702
Checking .............................................. 598
Preparing and checking
before winter ....................................384
Cooling system ..................................... 598
Engine overheating .......................... 692
Cornering lights.................................... 253
Cruise control
Dynamic radar cruise control
with full-speed range .................. 300
Cup holders.............................................. 531
Curtain shield airbags ............................ 37
Customizable features ....................... 722
Customized mode................................373

762 Alphabetical index
RX350/RX350L_U Eco drive mode ..................................... 373
Eco Driving Indicator........................... 105
EDR (Event data recorder) ...................10
Electric Power Steering (EPS) ....... 378
Warning light ...................................... 655
Electronic key ......................................... 120
Battery-saving function .....................147
If the electronic key does not
operate properly............................ 684
Replacing the battery .......................623
Emergency flashers ............................. 644
Emergency, in case of
If a warning buzzer sounds.......... 654
If a warning light turns on.............. 654
If a warning message is
displayed.............................................. 661
If the battery is discharged ........... 687
If the electronic key does not
operate properly............................ 684
If the engine will not start............... 682
If you have a flat tire ......................... 666
If you lose your keys .................. 121, 123
If you think something is
wrong ...................................................652
If your vehicle becomes stuck .... 695
If your vehicle has to
be stopped in an emergency .. 645
If your vehicle needs to be
towed................................................... 646
If your vehicle overheats ................692 Engine
ACCESSORY mode ..................... 232
Compartment ..................................... 594
Engine switch ........................................ 231
Hood........................................................ 592
How to start the engine.................... 231
Identification number.......................700
If your vehicle has to be
stopped in an emergency.......... 645
Ignition switch (engine switch) ..... 231
Overheating......................................... 692
Engine coolant
Capacity................................................. 702
Checking .............................................. 598
Preparing and checking
before winter ....................................384
Engine coolant temperature
gauge ........................................................ 86
Engine immobilizer system .................. 74
Engine oil
Capacity.................................................700
Checking ...............................................595
Preparing and checking
before winter ....................................384
Engine oil maintenance data ............597
Engine switch ........................................... 231
Enhanced VSC ..................................... 378
EPS
(Electronic Power Steering) ........ 378
Warning light .......................................655
Event data recorder (EDR)................... 10E

768 Alphabetical index
RX350/RX350L_U Odometer ................................................ 104
Oil
Engine oil............................................... 700
Rear differential oil .............................703
Transfer oil .............................................703
Opener
Fuel filler door ........................................ 271
Hood ........................................................592
Power back door .................................. 131
Outside rear view mirrors ................. 184
Adjusting and folding........................ 184
Blind Spot Monitor (BSM)............. 313
Linked mirror function when
reversing .............................................. 185
Mirror position memory ................... 172
Outside rear view mirror
defoggers ............................................ 513
Outside temperature display ............. 86
Overheating ........................................... 692
Paddle shift switches ................. 241, 242
Panic mode ................................................ 121
Panoramic moon roof ......................... 195
Jam protection function ................... 196
Operation ............................................... 195 Parking brake ......................................... 247
Parking brake engaged
warning buzzer/message ......... 249
Warning light .......................................655
Parking lights
Light switch........................................... 252
Replacing light bulbs .......................630
PCS (Pre-Collision System).............. 281
Warning light .......................................656
Personal lights ....................................... 526
Power back door ...................................130
Touchless power back door.......... 132
Wireless remote control................. 130
Power back door opener and
closer .......................................................130
Power easy access system ................. 172
Power outlets ........................................... 551
Power steering (Electric Power
Steering system)................................ 378
Warning light .......................................655
Power windows
Door lock linked window
operation ............................................. 189
Jam protection function................... 188
Operation................................................187
Window lock switch ..........................187
Pre-Collision System (PCS).............. 281
Warning light .......................................656O
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