2021 TOYOTA PRIUS coolant temperature

6577-2. Steps to take in an emergency
PRIUS_OM_OM47E09U_(U)
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When trouble arises
The coolant level is satisfactory if it is between the “MAX” and
“MIN” lines on the reservoir.
Reservoir
“MAX” line
“MIN” line
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fans operate and to check for
coolant leaks from t he radiator or hoses.
The fans operate when the air conditioning system is turned on immedi-
ately after a cold start. Confirm that the fans are operating b y checking
the fan sound and air flow. If it is difficult to check these, turn the air con-
ditioning system on and off repeatedly. (The fans may not operate in
freezing temperatures.)
If the fans are not operating:
Stop the hybrid system immediately and contact your Toyota
dealer.
If the fans are operating:
Have the vehicle inspected at the neare st Toyota dealer.
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6597-2. Steps to take in an emergency
PRIUS_OM_OM47E09U_(U)
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When trouble arises
After stopping the hybrid system and waiting for 5 minutes or
more, start the hybrid system again and check if “Hybrid System
Overheated” is shown on the multi-information display.
If the message d oes not disappear:
Stop the hybrid system and contact your Toyota dealer.
If the message is not displayed:
The hybrid system temperature has dropped and the vehicle may
be driven normally.
However, if the message appears again frequently, contact your To y o t a
dealer.
WARNING
■ To prevent an accident or injury when inspecting under the hood of
your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
● If steam is seen coming from under the hood, do not open the ho od until
the steam has subsided. The engine compartment may be very hot.
● After the hybrid system has been turned off, check that the “Accessory”,
“Ignition ON” or mileage display ( P. 116) on the main display and the
“READY” indicator are off.
When the hybrid system is operating, the gasoline engine may au tomati-
cally start, or the cooling fans may suddenly operate even if the gasoline
engine stops. Do not touch or approach rotating parts such as t he fan,
which may lead to fingers or clothing (especially a tie, a scarf or a muffler)
getting caught, resulting in serious injury.
● Do not loosen the coolant reservoir caps while the hybrid syste m and radi-
ator are hot.
High temperature steam or coolant could spray out.
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730Alphabetical index
PRIUS_OM_OM47E09U_(U)
Front turn signal lights ........... 261Replacing light bulbs............. 577
Turn signal lever ................... 261
Fuel ........................................... 675 Capacity ................................ 667
Fuel gauge ............................ 116
Information ............................ 675
Refueling............................... 283
Type ...................................... 667
Warning light ......................... 594
Fuel consumption............ 133, 170
Fuel filler door.......................... 283
Opener .................................. 285
Refueling............................... 283
When the fuel filler door cannot be opened............... 286
Fuses ........................................ 563
Garage door opener ................ 488
Glove box ................................. 462
Hands-free system (for
cellular phone)
*
Head restraints ........................ 209
Head-up display ....................... 158
Headlights ................................ 263 AHB (Automatic High Beam) ................................. 268
Headlight aim ................ 566, 716
Light switch ........................... 263
Replacing light bulbs............. 577
Heated steering wheel............. 456
Heaters Automatic air conditioning
system ....... ................. 436, 446
Heated steering wheel .......... 456
Outside rear view mirrors ........................ 440, 450
Seat heaters ......................... 456 High coolant temperature
warning light.......................... 594
High mounted stoplight Replacing.............................. 577
High-voltage components ........ 88
Hill-start assist control ........... 421
Hood ......................................... 515
Hooks
Cargo hooks ......................... 468
Coat hooks ........................... 486
Grocery bag hook ................. 469
Retaining hooks (floor mat) .... 26
Horn .......................................... 212
Hybrid battery (tr action battery)
Air intake vent ......................... 89
Location .................................. 88
Specification ......................... 667
Hybrid battery (traction battery) air intake vent............ 89 Cleaning ............................... 551
Hybrid system............................ 84 Brake Override System ........ 229
Drive-Start Control ................ 230
Emergency shut off system .... 89
Energy monitor/consumption
screen ................ 127, 165, 172
EV drive mode ...................... 252
High voltage components ....... 88
Hybrid System Indicator ....... 129
Hybrid system precautions ..... 88
Hybrid vehicle driving tips ..... 427
If the hybrid system will not start .................................... 645
Overheating .......................... 656
Power switch ........................ 245
Regenerative braking ............. 86
Starting the hybrid system .... 245
Vehicle proximity notification system .......... ..................... ... 85
Hybrid System Indicator ......... 129
Hybrid transmission................ 255
G
H

739Alphabetical index
PRIUS_OM_OM47E09U_(U)
Warning lights.......................... 107ABS....................................... 593
Brake Override System......... 596
Brake system ....... ................. 592
Charging system ................... 592
Drive-Start Control ................ 596
Driver’s seat belt reminder light ..................................... 595
Electronic engine control system ......... ....................... 592
Electric power steering
system ......... ....................... 593
Front passenger’s seat belt reminder light...................... 595
High coolant temperature ..... 594
Low engine oil pressure ........ 592
Low fuel level ........................ 594
Malfunction indicator lamp .... 592
Master warning light.............. 595
Open door ............................. 594
Parking Support Brake function ............................... 596
PCS ...................................... 593
PKSB OFF indicator ............. 594
Rear passengers’ seat belt
reminder light...................... 595
Seat belt reminder light ......... 595
Slip indicator ......................... 594
SRS ...................................... 593
Tire pressure......................... 595 Warning messages.................. 603
Warning reflector storage
space ...................................... 470
Washer ............................. 275, 281 Checking............................... 530
Preparing and checking
before winter ...................... 430
Switch ........................... 275, 281
Washing and waxing ............... 496
Water-repellent coating .......... 497
Weights .................................... 664 Cargo capacity...................... 242
Load limits ............................ 664
Wheels ...................................... 545
Replacing wheels ................. 631
Size....................................... 672
Window glasses ...................... 218
Window lock switch ................ 218
Windows Power windows..................... 218
Rear window
defogger ..................... 440, 450
Washer ......................... 275, 281
Windshield wipers ................... 275 Handling the wiper arms ....... 501
Rain-sensing windshield wipers ................................. 277
Replacing the wiper insert .... 556
Winter driving tips ................... 430
Wiper insert replacement ....... 556
Wireless charger ..................... 477
Wireless remote control ......... 180 Battery-Saving Function ....... 198
Locking/Unlocking ................ 186
Panic mode........................... 181
Replacing the battery............ 560
WMA disc
*1
*1: Refer to “MULTIMEDIA OWNER’S MANUAL”.
*2: Refer to “NAVIGATION S YSTEM OWNER’S MANUAL”.