2023 TOYOTA HIGHLANDER radiator cap

3866-3. Do-it-yourself maintenance
Engine coolant reservoir ( P.389)
Fuse boxes ( P.412)
Engine oil filler cap ( P.387)
Engine oil level dipstick ( P.386)
Battery ( P.391)
Brake fluid reservoir ( P.390)
Washer fluid tank ( P.392)
Electric cooling fan
Condenser ( P.390)
Radiator ( P.390)
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

3896-3. Do-it-yourself maintenance
6
Maintenance and careThe 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.469)
■Coolant selection
Only use “Toyota Super Long Life
Coolant” or a similar high quality
ethylene glycol ba sed 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% c oolant and 50%
deionized water. (Minimum tem-
perature: -31°F [-35°C])
Canada:
“Toyota Super Long Life Coolant” is
a mixture of 55% c oolant 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 le vel on the dip-
stick every time you refill the
vehicle.
●Be sure the engine oil filler cap
is properly tightened.
■If oil is spilled on the engine
cover
To prevent the engine cover from
being damaged, remove any
engine oil from the engine cover
as soon as possible using a neu-
tral detergent. Do not use an
organic solvent such as brake
cleaner.
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.

4707-2. Steps to take in an emergency
hoses and radiator core (radi-
ator) for any leaks.
Radiator
Cooling fan
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
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- 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.

4717-2. Steps to take in an emergency
7
When trouble arises
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 difficult 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 m ay 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 engin e 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

533Alphabetical Index
R
Radar cruise control (dynamic radar cruise control with
full-speed range) .................. 249
Radiator ................................... 390
RCTA Function ............................... 283
Warning message ................ 284
RCTA function......................... 284
Rear automatic air conditioning system ................................... 331
Rear Cross Traffic Alert (RCTA) ............................................... 283
Rear door sunshades ............ 360
Rear seats ............................... 137 Head restraints ..................... 145
Seat heaters ......................... 335
Rear side marker lights Light switch .......................... 210
Replacing light bulbs ............ 415
Rear turn signal lights Replacing light bulbs ............ 415
Turn signal lever ................... 204
Rear view mirror Digital Rearview Mirror ......... 150
Inside rear view mirror.......... 149
Outside rear view mirrors ..... 160
Rear window defogger ........... 324
Refueling Capacity ............................... 475
Fuel types............................. 475
If the fuel filler door cannot be opened ............................... 462
Opening the fuel tank cap .... 221
Replacing Electronic key battery ........... 410
Fuses ................................... 412
Light bulbs ............................ 415
Tires ..................................... 446
Reporting safety defects for U.S. owners................................... 510 Resetting the message indicat-
ing maintenance is required 377
Road Sign Assist ....................261
Rock & Dirt mode ...................301
RSA (Road Sign Assist) .........261
S
Safety Connect .........................65
Seat belt reminder light..434, 435
Seat belts...................................27 Automatic Locking Retractor ..28
Child restraint sys tem installation
.............................................52
Cleaning and maintaining the seat belt ..............................373
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 .434, 435
Seat belt extender ..................28
Seat belt pretensioners ..........32
SRS warning light .................432
Seat heaters ............................335
Seat position memory ............142
Seat ventilators .. .....................335
Seating capacity .....................184
Seats Adjustment ...........................136
Adjustment precautions ........136
Child seats/child restraint system installation ............................50
Cleaning ...............................373
Driving position memory .......142
Head restraints .....................145
Properly sitting in the seat ......25
Seat heaters ....... ..................335
Seat position memory...........142
Seat ventilators.....................335