radiator cap TOYOTA RAV4 PRIME 2021 Owners Manual

4607-3. Do-it-yourself maintenance
Fuse boxes (P.495)
Engine oil filler cap ( P.461)
Engine oil level dipstick ( P.460)
Brake fluid reservoir ( P.464)
Radiator ( P.463)
Electric cooling fan
Condenser ( P.463)
Power control unit coolant reservoir ( P.463)
Washer fluid tank ( P.465)
Engine coolant reservoir ( P.462)
■12-volt battery
 P.466
With the engine at operating
temperature and turned off,
Engine compartment
Components
A
B
C
D
E
F
G
H
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4637-3. Do-it-yourself maintenance
7
Maintenance and care
Reservoir cap
“FULL” line
“LOW” line
I f t he le ve l is on o r be low th e “L O W ”
line, add coolant up to the “FULL”
line. (P.544)
■Power control unit coolant
reservoir
Reservoir cap
“FULL” line
“LOW” line
I f t he le ve l is on o r be low th e “L O W ”
line, add coolant up to the “FULL”
line. ( P.546)
■Coolant selection
Only use “Toyota Super Long Life
Coolant” or a similar high quality
ethylene glycol based non-silicate,
non-amine, non-nitrite, and non-
borate coolant with long-life hybrid
organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is
a mixture of 50% coolant and 50%
deionized water. (Minimum tem-
perature: -31°F [-35°C])
Canada:
“Toyota Super Long Life Coolant” is
a mixture of 55% coolant and 45%
deionized water. (Minimum tem-
perature: -44°F [-42°C])
For more details about coolant, con-
tact your To yota dealer.
■If the coolant level drops within
a short time of replenishing
Visually check the radiators, hoses,
engine/power control unit coolant
reservoir caps, drain cock and water
pump.
If you cannot find a leak, have your
Toyota dealer, test the cap and
check for leaks in the cooling sys-
tem.
Check the radiator and con-
denser, and clear away any for-
eign objects.
If either of the above parts is
extremely dirty or you are not
sure of their condition, have
A
B
C
A
B
C
WARNING
■When the hybrid system is
hot
Do not remove the engine/power
control unit coolant reservoir
caps.
The cooling system may be under
pressure and may spray hot cool-
ant if the cap is removed, causing
serious injuries, such as burns.
NOTICE
■When adding coolant
Coolant is neither plain water nor
straight antifreeze. The correct
mixture of water and antifreeze
must be used to provide proper
lubrication, corrosion protection
and cooling. Be sure to read the
antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to
prevent it from damaging parts or
paint.
Checking the radiator and
condenser

5478-2. 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.

608Alphabetical Index
Back door ..................... 205, 207
Fuel filler door ...................... 307
Garage door ......................... 435
Hood..................................... 457
Outer foot lights Replacing light bulbs ............ 497
Wattage ................................ 556
Outside rear view mirrors ...... 244 Adjusting and folding ............ 244
BSM (Blind Spot Monitor)..... 347
Outside rear view mirror defog-gers .................................... 398
Outside temperature display . 168
Overheating ............................ 544
P
Paddle shift switches ............. 287
Panic mode ............................. 196
Panoramic moon roof Jam protection function ........ 253
Operation ............................. 252
Warning message ................ 254
Parking assist sensors (intuitive parking assist) ...................... 356
Parking brake Operation ............................. 290
Parking brake engaged warning buzzer ................................ 292
Warning light ........................ 517
Warning message ................ 291
Parking lights Light switch .................. 295, 295
Replacing light bulbs ............ 497
Wattage ................................ 556
Parking Support Brake (PKSB) ............................................... 363Indicator ............................... 163
Parking Support Brake function (rear-crossing vehicles) ...... 373
Parking Support Brake function (static objects) .................... 368
Warning light ........................ 515 Warning message .
...............367
PCS (Pre-Collision System) Enabling/disabling the pre-colli-sion system ........................317
Function................................315
Warning light ........................514
Warning messag e ........313, 526
Personal lights ........................411 Switch ...................................411
Wattage ................................556
PKSB (Parking Support Brake) ...............................................363Indicator................................163
Parking Support Brake function (rear-crossing vehicles) ......373
Parking Support Brake function (static objects) ....................368
Warning light ........................515
Warning message . ...............367
Plug-in hybrid system ..............76 AUTO EV/HV mode switch .....78
AUTO EV/HV mode ................77
Driving tips..............................92
EV driving range .....................95
EV mode.................................77
EV/HV mode selection switch 78
Features .................................76
How to charge ......................123
HV mode ................................77
Hybrid battery (tr action battery)
charge mode ........................77
Power back door switch 207, 207
Power control unit coolant ....462 Capacity ...............................553
Checking ..............................463
Preparing and checking before winter ..................................387
Radiator ................................463
Power outlets ..................420, 421
Power sources ........................111
Power steering (Electric Power Steering system)...................381

Alphabetical Index609
Warning light ........................ 513
Power switch .......................... 279 Auto power off function ........ 283
Changing the power switch modes ................................ 283
If your vehicle has to be stopped in an emergency................. 505
Starting the hybrid system.... 279
Power windows Catch protection function ..... 246
Door lock linked window opera-tion ..................................... 247
Jam protection function ........ 246
Operation ............................. 246
Window lock switch .............. 248
Pre-Collision System (PCS) Enabling/disabling the pre-colli-sion system ........................ 317
Function ............................... 315
Warning light ........................ 514
Warning message ........ 313, 526
Predictive efficient drive .......... 85
R
Radar cruise control Dynamic radar cruise control with full-speed range .......... 336
Radiator ................................... 463
RCTA (Rear Cross Traffic Alert) RCTA Function............. 347, 353
Warning message ................ 348
Rear Cross Traffic Alert (RCTA) ............................................... 347
Rear passengers’ seat belt reminder light ....................... 519
Rear seat ................................. 225 Folding down the rear seatbacks........................................... 226
Head restraints ..................... 230
Seat heaters ......................... 408
Rear side marker lights Light switch .......................... 295 Replacing light bulbs ............497
Rear turn signal lights Replacing light bulbs ............497
Turn signal lever . ..................289
Wattage ................................556
Rear view mirror Digital Rear-view Mirror ........234
Inside rear view mirror ..........233
Outside rear view mirrors .....244
Rear window defogger ...........398
Rear window wiper .................304
Refueling ............ .....................306
Capacity ...............................551
Fuel types .....................551, 557
If the fuel filler door cannot be opened ...............................536
Opening the fuel tank cap ....307
Regenerative braking ...............82
Remote Air Conditioning System ...............................................405
Replacing Electronic key battery ...........493
Fuses....................................495
Light bulbs ............................497
Tires .....................................527
Wiper insert ..........................489
Reporting safety defects for U.S. owners ...................................584
Resetting the message indicat- ing maintenance is required 451
Road accident cautions ...........89
Road Sign Assist ....................333
RSA (Road Sign Assist) .........333
S
Safety Connect .........................66
Seat belt reminder light..518, 519
Seat belts...................................29 Adjusting the seat belt shoulder anchor height........................31
Automatic Locking Retractor (ALR) ....................................31