air condition LEXUS RX450H 2020 Repair Manual

6928-2. Steps to take in an emergency
RX350/RX350L_U
Stop the vehicle in a safe place and turn 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 cap
If 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
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6938-2. Steps to take in an emergency
8
When trouble arises
RX350/RX350L_U
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 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 fans may not operate in freezing temperatures.)
If the fans are not operating:
Stop the engine immediately an d contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
Check if “Engine Coolant Temp High St op in a Safe Place See Owner’s Man-
ual” is shown on the multi-information display.
If the message does not disappear:
Stop the engine and contact your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the nearest Lexus dealer.
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7169-1. Specifications
RX350/RX350L_U
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pressure
Tire pressure when the vehicle has been parked for
three hours or more, or has no t been driven more than 1
mile or 1.5 km un der that condition
Maximum inflation pres-
sureThe maximum cold inflated pr essure to which a tire may
be inflated, shown on the sidewall of the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a manu-
facturer
Accessory weight
The combined weight (in exce ss of those standard items
which may be replaced) of automatic transmission,
power steering, power brakes, power windows, power
seats, radio and heater, to the extent that these items are
available as factory-installed equipment (whether
installed or not)
Curb weight
The weight of a motor vehicle with standard equipment,
including the maximum capacity of fuel, oil and coolant,
and if so equipped, air co nditioning and additional
weight optional engine
Maximum loaded vehicle
weight
The sum of:
(a) Curb weight
(b) Accessory weight
(c) Vehicle capacity weight
(d) Production options weight
Normal occupant weight150 lb. (68 kg) times the numb er of occupants specified
in the second column of Table 1* that follows
Occupant distributionDistribution of occupants in a vehicle as specified in the
third column of Table 1
* below

7329-2. Customization
RX350/RX350L_U
■Driving mode select switch ( P. 373)
*: If equipped
■Front automatic air conditioning system ( P. 503)
*:If equipped
■Seat heaters*/seat ventilators* ( P. 522, 523)
*:If equipped
FunctionDefault settingCustomized setting
Powertrain control in customized
mode
*NormalPowerO—Eco
Chassis control in customized
mode*NormalSportO—
Air conditioning operation in
customized mode
*NormalEcoO—
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FunctionDefault settingCustomized setting
A/C auto switch operationOnOffOO
Exhaust gas sensor sensitivity*Standard-3 to 3OO
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FunctionDefault settingCustomized setting
Driver’s seat temperature prefer-
ence in automatic modeStandard-2 (cooler) to 2
(warmer)OO
Front passenger’s seat tempera-
ture preference in automatic
modeStandard-2 (cooler) to 2 (warmer)OO
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756
RX350/RX350L_UAlphabetical index
Alphabetical index
A/C ............................................................503
Air conditioning filter......................... 618
Automatic air conditioning system ...................................... 503, 518
S-FLOW mode ..................................... 511
ABS (Anti-lock Brake System)....... 378 Warning light ...................................... 654
Adaptive Front-lighting System (AFS) ...................................................... 253
Adaptive Variable Suspension System ................................................... 379
AFS (Adaptive Front-lighting System) .................................................. 253
Air conditioning filter ........................... 618
Air conditioning system Air conditioning filter......................... 618
Automatic air conditioning system ...................................... 503, 518
S-FLOW mode ..................................... 511 Airbags .........................................................36
Airbag operating conditions .......... 43
Airbag precautions for your child.......................................................... 39
Airbag warning light ........................ 654
Correct driving posture .................... 30
Curtain shield airbag operating conditions ....................... 43
Curtain shield airbag precautions ............................................ 41
Front passenger occupant classification system..........................47
General airbag precautions ........... 39
Locations of airbags............................ 36
Modification and disposal of airbags .....................................................42
Seat cushion airbag ..............................37
Side airbag operating conditions ............................................. 43
Side airbag precautions .................... 39
Side and curtain shield airbags operating conditions ....................... 43
Side and curtain shield airbags precautions .......................................... 39
SRS airbag instructions for Canadian owners .......................... 740
SRS airbags ............................................. 36
A

757Alphabetical index
RX350/RX350L_U
Alarm ............................................................. 77
All-wheel drive lock mode ................377
Anchor brackets ...................................... 57
AntennaRadio ........................................................ 423
Smart access system with push-button start ................... 146
Anti-lock Brake System (ABS)....... 378 Warning light ...................................... 654
Approach warning...............................308
Armrest .................................................... 555
Assist grips .............................................. 556
Audio system (with Lexus Display Audio System) ................... 394 Antenna .................................................. 423
Audio input........................................... 403
AUX port.............................................. 403
Bluetooth
® audio ..............................453
CD player .............................................. 427
iPod ...........................................................434
MP3/WMA disc ............................... 427
Optimal use ........................................... 413
Portable music player ...................... 442
Radio ........................................................420
Setup menu .......................................... 406
Steering wheel audio switches .............................................. 400
USB memory ...................................... 438 Audio system
(with navigation system)
*
Automatic air conditioning system .......................................... 503, 518 Air conditioning filter ........................ 618
S-FLOW mode..................................... 511
Automatic headlight leveling system .....................................................254
Automatic High Beam ....................... 256
Automatic light control system .......252
Automatic transmission.......... 236, 240 If the shift lever cannot be shifted from P ....................... 239, 244
M mode .................................................. 242
Paddle shift switches.............. 241, 242
S mode.....................................................237
AUX port ................................................ 403
Auxiliary boxes ......................... 535, 540
*: Refer to the “NAVIGATION SYSTEM OWNER’S MANUAL”.

763Alphabetical index
RX350/RX350L_U
Flat tire ...................................................... 666
Floor mats ................................................... 28
FluidAutomatic transmission ..................703
Brake ........................................................704
Washer .................................................. 603
Fog lights Replacing light bulbs ....................... 630
Switch...................................................... 260
Front automatic air conditioning system .........................503
Front passenger footwell hooks ..... 554
Front passenger occupant classification system .............................47
Front passenger’s seat belt reminder light ..................................... 656
Front seat heaters................................. 522
Front seats .................................................156 Adjustment ............................................. 156
Cleaning .................................................. 581
Correct driving posture ....................30
Driving position memory ................. 172
Head restraints ...................................... 177
Power easy access system ............. 172
Seat heaters .......................................... 522
Seat position memory........................ 172 Front side marker lights
Light switch........................................... 252
Replacing light bulbs .......................630
Wattage ................................................. 705
Front turn signal lights Replacing light bulbs .......................630
Turn signal lever ................................. 246
Wattage ................................................. 705
Fuel Capacity.................................................700
Fuel gauge ............................................... 86
Information............................................ 706
Refueling ................................................ 269
Type..........................................................700
Fuel filler door.........................................269 Refueling ................................................ 269
When the fuel filler door cannot be opened ..........................272
Fuses.......................................................... 625
F

764Alphabetical index
RX350/RX350L_U
Garage door opener .......................... 557
Gauges ........................................................ 86
Glove box ................................................530
Grocery bag hooks ............................. 537
Hands-free system (for cellular phone) ........................... 455
Head restraints ........................................ 177
Head-up display..................................... 108
Headlight cleaner...................................261
Headlights ............................................... 252 Automatic headlight leveling .......254
Automatic High Beam ....................256
Light switch ........................................... 252
Replacing light bulbs ....................... 630
Wattage ................................................. 705
Windshield wiper linked headlight illumination................... 255
Heated steering wheel ....................... 522 Heaters
Automatic air conditioning system .......................................503, 518
Heated steering wheel ................... 522
Outside rear view mirrors ..............513
Seat heaters .............................. 522, 523
High mounted stoplight Replacing ...............................................630
Hill-start assist control ....................... 378
Hood ......................................................... 592
Hooks Cargo hooks .......................................536
Cargo net hooks ...............................536
Front passenger footwell hooks....................................................554
Grocery bag hooks ......................... 537
Retaining hooks (floor mat)............. 28
Horn............................................................ 180
HUD (Head-up display)..................... 108
G
H

769Alphabetical index
RX350/RX350L_U
Radar cruise control (dynamic radar cruise control
with full-speed range) .....................300
Radiator .................................................... 599
Radio.......................................................... 420
Rear automatic air conditioning system ..................................................... 518
Rear Cross Traffic Alert ......................313
Rear Cross Traffic Auto Brake.......350
Rear door sunshades .......................... 554
Rear passengers' seat belt reminder light ..................................... 656
Rear seat Folding down the rear seatbacks ............................................. 157
Rear side marker lights Light switch ........................................... 252
Replacing light bulbs ....................... 630
Rear turn signal lights Replacing light bulbs ....................... 630
Turn signal lever .................................246
Wattage ................................................. 705
Rear view mirror Inside rear view mirror ..................... 182
Outside rear view mirrors .............. 184 Rear window defogger ........................ 513
Rear window wiper .............................. 267
Refueling...................................................269
Capacity.................................................700
Fuel types...............................................700
Opening the fuel tank cap ............ 269
When the fuel filler door cannot be opened ..........................272
Remote Touch
*.....................................496
Replacing Electronic key battery ..................... 623
Fuses ........................................................ 625
Light bulbs.............................................630
Tires ..........................................................666
Windshield wiper inserts ................. 621
Reporting safety defects for U.S. owners ......................................... 738
Resetting the message indicating maintenance is required ................ 585
Rev indicator ............................................. 88
Rev peak ..................................................... 88
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