radiator cap TOYOTA HIGHLANDER 2020 Owners Manual (in English)

4046-3. Do-it-yourself maintenance
HIGHLANDER_U
Engine coolant reservoir (P.407)
Fuse boxes ( P.429)
Engine oil filler cap ( P.405)
Engine oil level dipstick ( P.404)
Battery ( P.408)
Brake fluid reservoir ( P.408)
Washer fluid tank ( P.410)
Electric cooling fan
Condenser ( P.408)
Radiator ( P.408)
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

4076-3. Do-it-yourself maintenance
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6
Maintenance and care
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.487)
■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.

4877-2. Steps to take in an emergency
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7
When trouble arises1 Stop the vehicle in a safe
place and turn off the air con-
ditioning system, and then
stop the engine.
2 If you see steam:
Carefully lift the hood after
the steam subsides.
If you do not see steam:
Carefully lift the hood.
3 After the engine has cooled
down sufficiently, inspect the
hoses and radiator core (radi-
ator) for any leaks.
If a large amount of coolant leaks,
immediately contact your Toyota dealer.
Radiator
Cooling fan
4 The 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-
If your vehicle over-
heats
The following may indicate
that your vehicle is over-
heating.
The needle of the engine
coolant temperature gauge
( P.79) enters the red zone
or a loss of engine power is
experienced. (For example,
the vehicle speed does not
increase.)
 “Engine Coolant Temp High
Stop in a Safe Place See
Owner’s Manual” is shown
on the multi-information dis-
play.
 Steam comes out from
under the hood.
Correction procedures

4887-2. Steps to take in an emergency
HIGHLANDER_Ugency 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.
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.

553Alphabetical Index
HIGHLANDER_U
PKSB (Parking Support Brake) ............................................... 289Warning message ................ 294
Power outlets .......................... 376
Power steering (Electric power steering system)................... 313Warning light ........................ 452
Power windows Door lock linked window opera-tion ..................................... 165
Jam protection function ........ 164
Operation ............................. 164
Window lock switch .............. 166
Pre-Collision System (PCS) Function ............................... 233
PCS OFF switch................... 235
Warning light ........................ 456
R
Radar cruise control (dynamic radar cruise control with
full-speed range) .................. 254
Radiator ................................... 408
RCTA Function ............................... 284
Warning message ................ 285
RCTA function......................... 286
Rear automatic air conditioning system ................................... 348
Rear Cross Traffic Alert (RCTA) ............................................... 284
Rear door sunshades ............ 378
Rear fog lights Switch................................... 220
Rear manual air conditioning system ................................... 346
Rear seats ............................... 139 Head restraints ..................... 147
Seat heaters ......................... 352
Rear side marker lights Light switch .......................... 214
Replacing light bulbs ............ 432 Rear turn signal lights
Replacing light bulbs ............432
Turn signal lever ...................208
Rear view mirror Digital Rearview Mirror .........152
Inside rear view mirror ..........151
Outside rear view mirrors .....162
Rear window defogger ..329, 335, 339
Refueling Capacity ...............................495
Fuel types .............................495
If the fuel filler door cannot be opened ...............................480
Opening the fuel tank cap ....225
Replacing Electronic key battery ...........428
Fuses....................................429
Light bulbs ............................432
Tires......................................464
Reporting safety defects for U.S. owners ...................................530
Resetting the message indicat- ing maintenance is required 395
Road Sign Assist ....................251
Rock & Dirt mode ...................307
RSA (Road Sign Assist) .........251
S
Safety Connect .........................63
Seat belt reminder light..........453
Seat belts...................................25 Automatic Locking Retractor ..26
Child restraint system installation.............................................50
Cleaning and maintaining the seat belt ..............................391
Emergency Locking Retractor 26
How to wear your seat belt .....26
How your child should wear the seat belt ................................26