radiator cap TOYOTA HIGHLANDER 2021 Owners Manual (in English)

4126-3. Do-it-yourself maintenance
HIGHLANDER_U
Engine coolant reservoir (P.415)
Fuse boxes ( P.438)
Engine oil filler cap ( P.413)
Engine oil level dipstick ( P.412)
Battery ( P.416)
Brake fluid reservoir ( P.416)
Washer fluid tank ( P.418)
Electric cooling fan
Condenser ( P.416)
Radiator ( P.416)
With the engine at operating
temperature and turned off,
check the oil level on the dip- stick.
■Checking the engine oil
1 Park the vehicle on level
ground. After warming up the
engine and turning it off, wait
Engine compar tment
Components
Checking and adding the
engine oil

4156-3. Do-it-yourself maintenance
6
Maintenance and care
HIGHLANDER_U
The coolant level is satisfactory
if it is between the “FULL” and
“LOW” lines on the reservoir
when the engine is cold.Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the “LOW”
line, add coolant up to the “FULL”
line. ( P.495)
■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 Toyota dealer.
■If the coolant level drops within
a short time of replenishing
Visually check the radiator, hoses,
engine coolant reservoir cap, 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.
NOTICE
■When replacing the engine oil
●Be careful not to spill engine oil
on the vehicle components.
●Avoid overfilling, or the engine
could be damaged.
●Check the oil level on the dip-
stick every time you refill the
vehicle.
●Be sure the engine oil filler cap
is properly tightened.
Checking the coolant
WARNING
■When the engine is hot
Do not remove the engine coolant
reservoir cap and radiator cap.
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.

4967-2. Steps to take in an emergency
HIGHLANDER_U
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
Radiator cap
5 Add coolant if necessary.
Water can be used in an emer- gency if coolant is unavailable.
6
Start the engine and turn the
air conditioning system on to
check that the radiator cool-
ing 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, turn the air
conditioning system on and off
repeatedly. (The fan may not oper-
ate in freezing temperatures.)
7If the fan is not operating:
Stop the engine 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
Place See Owner's Manual”
is shown on the multi-infor-
mation display.
If the message does not disappear:
Stop the engine and contact your
Toyota dealer.
If the message is not displayed:
Have the vehicle inspected at the
nearest Toyota dealer.

4977-2. Steps to take in an emergency
7
When trouble arises
HIGHLANDER_U
1Stop the engine. Shift the
shift lever to P and set the
parking brake.
2 Remove the mud, snow or
sand from around the front
wheels.
3 Place wood, stones or some
other material under the front
wheels to help provide trac-
tion.
4 Restart the engine.
5 Shift the shift lever to D or R
and release the parking
brake. Then, while exercising
caution, depress the acceler-
ator pedal.
■When it is diffic ult to free the
vehicle
Press to turn off TRAC.
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.
●Keep hands and clothing (espe-
cially a tie, a scarf or a muffler)
away from the fan and belts.
Failure to do so may cause the
hands or clothing to be caught,
resulting in serious injury.
●Do not loosen the radiator cap
and the coolant reservoir cap
while the engine and radiator
are hot.
High temperature steam or
coolant could spray out.
NOTICE
■When adding engine coolant
Add coolant slowly after the
engine has cooled down suffi-
ciently. Adding cool coolant to a
hot engine too quickly can cause
damage to the engine.
■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.
If the vehicle becomes
stuck
Carry out the following pro-
cedures if the tires spin or
the vehicle becomes stuck
in mud, dirt or snow:
Recovering procedure

559Alphabetical Index
HIGHLANDER_UPower steering (Electric power
steering system)................... 321Warning light ........................ 460
Power windows Door lock linked window opera-tion ..................................... 168
Jam protection function ........ 167
Operation ............................. 167
Window lock switch .............. 169
Pre-Collision System (PCS) Function ............................... 235
PCS OFF switch................... 238
Warning light ........................ 464
R
Radar cruise control (dynamic radar cruise control with
full-speed range) .................. 257
Radiator ................................... 416
RCTA Function ............................... 292
Warning message ................ 293
RCTA function......................... 294
Rear automatic air conditioning system ................................... 356
Rear Cross Traffic Alert (RCTA) ............................................... 292
Rear door sunshades ............ 386
Rear fog lights Switch................................... 222
Rear manual air conditioning system ................................... 354
Rear seats ............................... 142 Head restraints ..................... 150
Seat heaters ......................... 360
Rear side marker lights Light switch .......................... 216
Replacing light bulbs ............ 441
Rear turn signal lights Replacing light bulbs ............ 441
Turn signal lever ................... 210 Rear view mirror
Digital Rearview Mirror .........155
Inside rear view mirror ..........154
Outside rear view mirrors .....165
Rear window defogger ..337, 343, 347
Refueling Capacity ...............................501
Fuel types .............................501
If the fuel filler door cannot be opened ...............................488
Opening the fuel tank cap ....227
Replacing Electronic key battery ...........436
Fuses....................................438
Light bulbs ............................441
Tires......................................472
Reporting safety defects for U.S. owners ...................................536
Resetting the message indicat- ing maintenance is required 403
Road Sign Assist ....................269
Rock & Dirt mode ...................315
RSA (Road Sign Assist) .........269
S
Safety Connect .........................65
Seat belt reminder light..........461
Seat belts...................................27 Automatic Locking Retractor ..28
Child restraint system installation.............................................52
Cleaning and maintaining the seat belt ..............................399
Emergency Locking Retractor 28
How to wear your seat belt .....28
How your child should wear the seat belt ................................28
Pregnant women, proper seat belt use .................................27
Reminder light and buzzer ...461
Seat belt extender ..................28