2023 TOYOTA RAV4 PRIME coolant temperature

5428-2. Steps to take in an emergency
■High coolant temperature warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Hybrid system overheat warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Low engine oil pressure warning light* (warning buzzer)
*: This light illuminates on the mu lti-information display with a message.
■Malfunction indicator lamp
Warning lightDetails/Actions
Indicates that the engine is overheating
 Immediately stop the vehicle in a safe
place.
Handling method ( P.574)
Warning lightDetails/Actions
Indicates that the hybrid system has overheated
 Stop the vehicle in a safe place.
Handling method ( P.574)
Warning lightDetails/Actions
Indicates that the engine oil pressure is too low
 Immediately stop the vehicle in a safe
place and contact your Toyota dealer.
Warning lightDetails/Actions
(U.S.A.)
(Canada)
Indicates a malfunction in:
 The hybrid system;
 The electronic engi ne control system;
 The electronic throttle control system; or
 The emission control s ystem (if equipped)
 Have the vehicle inspected by your Toyota
dealer immediately.

5758-2. Steps to take in an emergency
8
When trouble arises
the steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the hybrid system has
cooled down sufficiently,
inspect the hoses and radia-
tor core (radiator) for any
leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
4The coolant level is satisfac-
tory if it is between the
“FULL” and “LOW” lines on
the reservoir.
Reservoir
“FULL” line
“LOW” line 5
Add coolant if necessary.
Water can be used in an emer-
gency if engine coolant is unavail-
able.
If water was added in an emer-
gency, have the vehicle inspected
at your Toyota dealer as soon as
possible.
6Start the hybrid system and
turn the air conditioning sys-
tem on to check that the radi-
ator cooling fan operates and
to check for coolant leaks
from the radiator or hoses.
The fan operates when the air con-
ditioning system is turned on imme-
diately after a cold start. Confirm
that the fan is operating by check-
ing the fan sound and air flow. If it is
difficult to check these, adjust the
temperature control switch to “LO”
and turn the “A/C” switch ON and
OFF. After this, turn the air condi-
tioning system on and off repeat-
edly. (The fan may not operate in
freezing temperatures.)
7 If the fan is not operating:
Stop the hybrid system
immediately and contact your
Toyota dealer.
If the fan is operating:
Have the vehicle inspected at
the nearest Toyota dealer.
8 Check if “Engine Coolant
Temp High Stop in a Safe
A
B
A
B
C

5768-2. Steps to take in an emergency
Place See Owner’s Manual”
is shown on the multi-infor-
mation display.
If the message does not disappear:
Stop the hybrid system and contact
your Toyota dealer.
If the message is not displayed:
Have the vehicle inspected at the
nearest Toyota dealer.
■If “Hybrid System Over-
heated Output Power
Reduced” is shown on the
multi-information display
1 Stop the vehicle in a safe
place.
2 Stop the hybrid system and
carefully lift the hood.
3 After the hybrid system has
cooled down, inspect the
hoses and radiator core (radi-
ator) for any leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
4The coolant level is satisfac-
tory if it is between the “FULL” and “LOW” lines on
the reservoir.
Reservoir
“FULL” line
“LOW” line
5 Add coolant if necessary.
Water can be used in an emer-
gency if power control unit coolant
is unavailable.
If water was added in an emer-
gency, have the vehicle inspected
at your Toyota dealer as soon as
possible.
6After stopping the hybrid sys-
tem and waiting for 5 minutes
or more, start the hybrid sys-
tem again and check for the
multi-information display.
If the message does not disappear:
Stop the hybrid system and contact
your Toyota dealer.
If the message is not displayed:
The hybrid system temperature has
A
B
A
B
C

5778-2. Steps to take in an emergency
8
When trouble arises
dropped and the vehicle may be
driven normally.
However, if the message appears
again frequently, contact your
Toyota dealer.
WARNING
■When inspecting under the
hood of your vehicle
Observe the following precau-
tions.
Failure to do so may result in seri-
ous injury such as burns.
●If steam is seen coming from
under the hood, do not open the
hood until the steam has sub-
sided. The engine compart-
ment may be very hot.
●After the hybrid system has
been turned off, check that the
“READY” indicator is off.
When the hybrid system is oper-
ating, the gasoline engine may
automatically start, or the cool-
ing fan may suddenly operate
even if the gasoline engine
stops. Do not touch or approach
rotating parts such as the 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 reser-
voir cap while the hybrid system
and radiator are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When adding engine/power
control unit coolant
Add coolant slowly after the
hybrid system has cooled down
sufficiently. Adding cool coolant to
a hot hybrid system too quickly
can cause damage to the hybrid
system.
■To prevent damage to the
cooling system
Observe the following precau-
tions:
●Avoid contaminating the coolant
with foreign matter (such as
sand or dust, etc.).
●Do not use any coolant additive.

5839-1. Specifications
9
Vehicle specifications
SAE 0W-16
SAE 0W-16 is the best choice
for good fuel economy and good
starting in cold weather.
If SAE 0W-16 is not available,
SAE 0W-20 oil may be used.
However, it must be replaced
with SAE 0W-16 at the next oil
change.Outside temperature
Oil viscosity (0W-16 is explained
here as an example):
• The 0W in 0W-16 indicates the characteristic of the oil
which allows cold startability. Oils with a lower value before
the W allow for easier starting
of the engine in cold weather.
• The 16 in 0W-16 indicates the viscosity characteristic of the
oil when the oil is at high tem-
perature. An oil with a higher
viscosity (one with a higher
value) may be better suited if
the vehicle is operated at high
speeds, or under extreme
load conditions.
How to read oil container label:
API registered mark is added to
some oil containers to help you
select the oil you should use.
*: The coolant capacity is the quantity of reference.
A
Cooling system
Capacity*Gasoline engine8.7 qt. (8.2 L, 7.2 Imp. qt.)
Power control unit2.1 qt. (2.0 L, 1.8 Imp. qt.)
Coolant type
Use either of the following:
 “Toyota Super Long Life Coolant”
 Similar high-quality ethylene gly-
col-based non-silicate, non-amine,
non-nitrite, and non-borate cool-
ant with long-life hybrid organic
acid technology
Do not use plain water alone.

5939-1. Specifications
9
Vehicle specifications
■Temperature A, B, C
The temperature grades are A
(the highest), B, and C, repre-
senting the tire’s resistance to
the generation of heat and its
ability to dissipate heat when
tested under controlled condi-
tions on a specified indoor labo-
ratory test wheel.
Sustained high temperature can
cause the material of the tire to
degenerate and reduce tire life, and
excessive temperature can lead to
sudden tire failure.
Grade C corresponds to a level of performance which all passenger
car tires must meet under the Fed-
eral Motor Vehicle Safety Standard
No. 109.
Grades B and A represent higher
levels of performance on the labo-
ratory test wheel than the minimum
required by law.
Warning: The temperature grades
of a tire assume tha
t it is properly
inflated and not overloaded.
Excessive speed, underinflation, or
excessive loading, either sepa-
rately or in combination, can cause
heat buildup and possible tire fail-
ure.
Glossary of tire terminology
Tire related termMeaning
Cold tire inflation pres-
sureTire pressure when the vehicle has been parked
for three hours or more, or has not been driven
more than 1 mile or 1.5 km under that condition
Maximum inflation pres-
sureThe maximum cold inflated pressure to which a
tire may be inflated, shown on the sidewall of
the tire
Recommended inflation
pressureCold tire inflation pressure recommended by a
manufacturer
Accessory weight
The combined weight (in excess of those stan-
dard items which may be replaced) of transmis-
sion, 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 th e maximum capacity of
fuel, oil and coolant, and if so equipped, air con-
ditioning and additional weight optional engine

Alphabetical Index639
Brake System) ...................... 407
Eco drive mode ...................... 404
EDR (Event data recorder)......... 8
E-Four (Electronic On-Demand AWD system) ........................ 408
Elapsed time ................... 190, 202
Electric motor Location.................................. 74
Specification ......................... 582
Electric Power Steering (EPS) Function ............................... 408
Warning light ........................ 543
Electronically Controlled Brake System (ECB) ....................... 407
Electronic key Battery-saving function......... 242
If the electronic key does not operate properly ................. 567
Replacing the battery ........... 522
Electronic sunshade .............. 276 Jam protection function ........ 277
Operation ............................. 276
Emergency, in case of If a warning buzzer sounds .. 541
If a warning light turns on ..... 541
If a warning message is dis-played................................. 552
If the 12-volt battery is dis- charged .............................. 569
If the electronic key does not operate properly ................. 567
If the fuel filler door cannot be opened ............................... 566
If the hybrid sy stem will not start
........................................... 564
If the vehicle is submerged or water on the road is rising .. 536
If you have a flat tire ............. 557
If you lose your keys ............ 566
If you think something is wrong ........................................... 540
If your vehicle becomes stuck ...........................................578
If your vehicle has to be stopped in an emergency .................535
If your vehicle needs to be towed ...........................................538
If your vehicle ove rheats ......574
Emergency flashers ...............534
Energy monitor .......................212
Engine Compartment........................489
Exhaust gas precautions ........48
Hood .....................................486
How to start the hybrid system...........................................304
Identification number ............581
If the hybrid sys tem will not start
...........................................564
If your vehicle has to be stopped in an emergency .................535
Overheating ..........................574
Power switch ........................304
Tachometer ..........................178
Engine coolant Capacity ...............................583
Checking ..............................491
High coolant temperature warn-ing light ...............................542
Preparing and checking before winter ..................................413
Warning light ........................542
Engine oil Capacity ...............................582
Checking ..............................489
Preparing and checking before winter ..................................413
Warning light ........................542
Enhanced Vehicle Stability Con- trol (Enhanced VSC ) .............407
Enhanced VSC (Enhanced Vehi- cle Stability Control).............407
EPS (Electric Po wer Steering)
Function................................408

640Alphabetical Index
Warning light ........................ 543
EV/HV mode selection switch . 76
EV driving range ....................... 93
Event data recorder (EDR)......... 8
EV mode .................................... 75
Exhaust gas precautions ......... 48
F
Flat tire .................................... 557 Tire pressure warning system........................................... 500
Floor mats ................................. 26
Fluid Brake ............................ 493, 585
Hybrid transmission.............. 584
Rear differential .................... 584
Washer ................................. 494
Footwell lights ..... ................... 436
Front passenger’s seat belt reminder light ....................... 548
Front passenger occupant clas- sification system .................... 43
Front seat concentrated airflow mode (S-FLOW) .................... 428
Front seat heaters .................. 433
Front seats .............................. 247 Adjustment ........................... 247
Cleaning ............................... 475
Correct driving posture ........... 27
Driving position memory....... 250
Head restraints ..................... 253
Memory recall function ......... 252
Seat heaters ......................... 433
Seat position memory .......... 250
Seat ventilators .................... 433
Front side marker lights ........ 321 Light switch .......................... 321
Replacing light bulbs ............ 528
Front turn signal lights Replacing light bulbs ............ 528
Turn signal lever................... 313
Fuel Capacity ...............................581
Fuel gauge ...................173, 178
Gas station information ........664
Information .........
..................587
Refueling ..............................332
Type .............................581, 587
Warning light ........................547
Fuel filler door.........................333 If the fuel filler door cannot be opened ...............................566
Opener .................................333
Refueling ..............................332
Fuel gauge...............................178
Fuses .......................................524
G
Garage door opene r ...............463
Gas station information .........664
Gauges ....................................178
Glove box ................................439
H
Headlights ...............................321 Automatic High Beam (AHB) 324
Light switch...........................321
Replacing light bulbs ............528
Headlights aim ........................527 Headlight aim instructions for Canadian owners ...............628
Head restraints .......................253
Head-up display ......................208
Heated steering wheel............433
Heaters Automatic air conditioning sys-tem .....................................422
Heated steering wheel..........433
Hybrid battery (tr action battery)
...........................................113
Outside rear view mirrors .....424
Seat heaters ....... ..................433
High coolant temperature warn-