2015 LEXUS NX300h overheating

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When trouble arises 8-2. Steps to take in an emergency
NX300h_U_OM78007UIf a warning light turns on or a warning buzzer
sounds Calmly perform the following actions if any of the warning lights comes on or
flashes. If a light comes on or flashes, bu t then goes off, this does not necessar-
ily indicate a malfunction in the system. However, if this continues to occur,
have the vehicle inspected by your Lexus dealer.
Warning light and warning buzzer list Warning light Warning light/Details/Actions(U.S.A.)
(Canada)
Brake system warning light
Indicates that:
• The brake fluid level is low; or
• The brake system is malfunctioning
 Immediately stop the vehicle in a safe place and contact your
Lexus dealer. Continuing to drive the vehicle may be dangerous.
* 1
Charging system warning light
Indicates a malfunction in the vehicle’s charging system
 Immediately stop the vehicle in a safe place and contact your
Lexus dealer. Continuing to drive the vehicle may be dangerous.
* 1
Low engine oil pressure warning light (warning buzzer)
Indicates that the engine oil pressure is too low
 Immediately stop the vehicle in a safe place and contact your
Lexus dealer. Continuing to drive the vehicle may be dangerous.
* 1
High coolant temperature warning light (warning buzzer)
Indicates that the engine is overheating
 Immediately stop the vehicle in a safe place. Continuing to drive
the vehicle may be dangerous.
Handling method (  P. 600)
Brake system warning light
Indicates a malfunction in:
• The regenerative braking system;
• The electronically controlled brake system; or
• The electric parking brake
 Have the vehicle inspected by your Lexus dealer immediately. (U.S.A.)
(Canada)
Malfunction indicator lamp
Indicates a malfunction in:
• The hybrid system;
• The electronic engine control system;
• The electronic throttle control system; or
• The emission control system
 Have the vehicle inspected by your Lexus dealer immediately.

600 8-2. Steps to take in an emergency
NX300h_U_OM78007UIf your vehicle overheats ■
“Engine Coolant Temp High” is shown on the multi-information display
Stop the vehicle in a safe place and tu rn off the air conditioning system, 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.The following may indicate that your vehicle is overheating. ●
The needle of the engine coolant temperature gauge (  P. 97) enters the
red zone, or a loss of hybrid system po wer is experienced. (For example, the
vehicle speed does not increase.) ●
“Engine Coolant Temp High” or “Hybrid System Overheated” is shown on
the multi-information display. ●
Steam comes out from under the hood.
Correction procedures 1
2
3
1
2

665Alphabetical index
NX300h_U_OM78007U Coat hooks.............................................. 466
Compass .................................................. 473
Condenser ..............................................509
Console box ........................................... 447
Consumption screen ...............................111
Coolant
Capacity .................................................. 613
Checking............................................... 508
Preparing and checking
before winter ....................................326
Warning light ...................................... 565
Cooling system .....................................508
Hybrid system overheating ......... 600
Cruise control
Cruise control...................................... 267
Dynamic radar cruise
control ..................................................240
Dynamic radar cruise control
with full-speed range ....................253
Cup holders ............................................ 448
Curtain shield airbags ........................... 40
Customizable features ....................... 633 Daytime running light system............ 221
Deck board..............................................452
Deck under tray ...................................... 451
Defogger
Outside rear view mirrors ............ 435
Rear window........................................ 435
Windshield............................................ 435
Differential ................................................ 614
Dimension ............................................... 608
Dinghy towing ....................................... 200
Display
Drive information................................ 103
Dynamic radar cruise
control.................................................. 240
Dynamic radar cruise control
with full-speed range ................... 253
Energy monitor........................................ 111
LDA (Lane Departure Alert
with steering control) ................... 270
Multi-information display.................102
Warning messages .......................... 572
Do-it-yourself maintenance............. 498
Doors
Automatic door locking and
unlocking system.............................. 127
Back door................................................ 129
Door glasses ..........................................166
Door lock................................................. 124
Outside rear view mirrors ..............163
Rear door child-p rotectors ............ 126
Side doors ............................................... 124 D

667Alphabetical index
NX300h_U_OM78007U If you have a flat tire ..........................575
If you lose your keys ................ 120, 122
If you think something is
wrong .................................................. 564
If your vehicle becomes
stuck ..................................................... 604
If your vehicle has to
be stopped in an
emergency.........................................557
If your vehicle needs to be
towed................................................... 558
If your vehicle overheats ............... 600
Energy monitor ..........................................111
Engine
Accessory mode................................202
Compartment..................................... 502
Engine switch ........................................ 201
Hood ....................................................... 500
How to start the hybrid
system ................................................... 201
Identification number ........................ 610
If your vehicle has to be
stopped in an emergency ..........557
Ignition switch
(power switch).................................. 201
Overheating ........................................ 600
Power switch......................................... 201 Engine compartment cover............. 503
Engine coolant
Capacity...................................................613
Checking .............................................. 508
Preparing and checking
before winter .................................... 326
Warning light .......................................565
Engine coolant temperature
gauge ......................................................... 97
Engine oil
Capacity.................................................... 611
Checking ...............................................504
Warning light .......................................565
Engine oil maintenance data ........... 506
Engine switch ........................................... 201
EPS (Electronic Power Steering)
Function ..................................................305
Warning light .......................................566
EV indicator ............................................... 79
EV drive mode ...................................... 206
Event data recorder (EDR).....................11

669Alphabetical index
NX300h_U_OM78007U Hands-free system
(for cellular phone) ........................... 392
Head restraints ....................................... 158
Headlights .................................................219
Automatic headlight leveling .........221
Automatic High Beam .................... 223
Light switch ............................................ 219
Replacing light bulbs ............. 541, 552
Wattage ....................................................617
Head-up display..................................... 106
Heated steering wheel .........................441
Heaters
Automatic air conditioning
system ................................................. 430
Heated steering wheel ................... 440
Outside rear view mirrors .............435
Seat heaters ......................................... 440
High mounted stoplight
Replacing .............................................. 552
Hill-start assist control ........................305
Hood ..........................................................500
Warning message .................. 128, 572
Hooks
Cargo hooks ....................................... 450
Retaining hooks (floor mat) ............. 28
Horn ............................................................ 160 Hybrid battery (traction battery)
Location ......................................................81
Specification ............................................ 611
Hybrid battery air vent .......................... 82
Hybrid system............................................ 77
Emergency shut off system ............. 82
Energy monitor/
consumption screen.......................... 111
EV drive mode ................................... 206
High voltage components .................81
Hybrid System Indicator ................. 100
Hybrid system precautions ...............81
Hybrid vehicle driving tips ............ 324
If the hybrid system will not
start....................................................... 589
Overheating........................................ 600
Power switch .........................................201
Regenerative braking ..........................79
Starting the hybrid system...............201
Vehicle proximity notification
system ..................................................... 78
Hybrid System Indicator .................... 100
Hybrid transmission ............................ 208H

672 Alphabetical index
NX300h_U_OM78007U Multi-information display
Drive information ................................ 103
Dynamic radar cruise
control ..................................................240
Dynamic radar cruise control
with full-speed range ....................253
Energy monitor ........................................ 111
Language .............................................. 638
LDA (Lane Departure Alert
with steering control) ...................253
Warning messages........................... 572
Navigation system
*Noise from under vehicle ....................... 8
Odometer ...................................................97
Oil
Engine oil................................................... 611
Rear differential oil .............................. 614
Opener
Back door ............................................... 130
Fuel filler door ......................................236
Hood ....................................................... 500
Outside rear view mirrors ..................163
Adjusting and folding........................ 163
Blind Spot Monitor (BSM)............. 316
Linked mirror function
when reversing ................................. 164
Mirror position memory .................. 154
Outside rear view mirror
defoggers ...........................................435 Outside temperature display .............. 97
Overheating........................................... 600
Panic mode ................................................ 119
Parking brake
Operation................................................ 213
Parking brake engaged
warning buzzer/message ........... 215
Warning light .......................................566
Parking lights
Light switch............................................. 219
Replacing light bulbs ....................... 552
Warning light .......................................566
PCS (Pre-Collision System)
Function ................................................... 310
PCS switch ...............................................311
Warning light .......................................566
Warning message............................. 572
Personal lights ........................................443
Switch ...................................................... 444
Power back door opener and
closer ....................................................... 129
Power control unit coolant
Capacity...................................................613
Checking .............................................. 508
Preparing and checking
before winter .................................... 326
Radiator ................................................. 509N
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