2020 TOYOTA HIGHLANDER HYBRID radiator cap

4106-3. Do-it-yourself maintenance
HIGHLANDER HV_U
Engine coolant reservoir ( P.413)
Fuse boxes ( P.439)
Engine oil filler cap ( P.411)
Engine oil level dipstick ( P.411)
Brake fluid reservoir ( P.414)
Washer fluid tank ( P.415)
Electric cooling fan
Condenser ( P.414)
Radiator ( P.414)
Power control unit coolant reservoir ( P.414)
■12-volt battery
 P. 4 1 6
With the engine at operating
temperature and turned off,
check the oil level on the dip-
Engine compar tment
Components
Checking and adding the
engine oil

4146-3. Do-it-yourself maintenance
HIGHLANDER HV_U
■If the coolant level drops within
a short time of replenishing
Visually check the radiator, 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 condi-
tion, have your vehicle inspected by your Toyota dealer.
■Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
■Adding fluid
Make sure to check the fluid
type and prepare the necessary
item.
 Fluid type
SAE J1703 or FMVSS No.116 DOT
3 brake fluid
Item
Clean funnel
■Brake fluid can absorb moisture
from the air
Excess moisture in the brake fluid
can cause a dangerous loss of brak-
ing efficiency. Use only newly
WA R N I N G
■When the hybrid system is
hot
Do not remove the engine/power
control unit coolant reservoir caps
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 d amaging parts or
paint.
Checking the radiator and
condenser
WA R N I N G
■When the hybrid system is
hot
Do not touch the radiator or con-
denser as they may be hot and
cause serious injuries, such as
burns.
Checking and adding the
brake fluid

4977-2. Steps to take in an emergency
HIGHLANDER HV_U
7
When trouble arises
If the engine coolant tempera-
ture gauge enters the red
zone or “Engine Coolant
Temp High Stop in a Safe
Place See Owner’s Manual”
is shown on the multi-informa-
tion display
1 Stop the vehicle in a safe
place and turn off the air con-
ditioning system, and then
stop the hybrid system.
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 hybrid system has
cooled down sufficiently,
inspect the hoses and radia-
tor core (radiator) 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
If your vehicle over-
heats
The following may indicate
that your vehicle is over-
heating.
The needle of the engine
coolant temperature gauge
( P.89) enters the red zone
or a loss of hybrid system
power is experienced. (For
example, the vehicle speed
does not increase.)
 “Engine Coolant Temp High
Stop in a Safe Place See
Owner’s Manual” or “Hybrid
System Overheated Output
Power Reduced” is shown
on the multi-information dis-
play.
 Steam comes out from
under the hood.
Correction procedures

4997-2. Steps to take in an emergency
HIGHLANDER HV_U
7
When trouble arises
“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 coolant is unavailable.
6After stopping the hybrid sys-
tem and waiting for 5 minutes
or more, start the hybrid sys-
tem again and check if
“Hybrid System Overheated
Output Power Reduced” is
shown on the 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
dropped and the vehicle may be
driven normally. However, if the m
essage appears
again frequently, contact your Toy-
ota dealer.
WA R N I N G
■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 radiator cap
and the coolant reservoir caps
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.

563Alphabetical Index
HIGHLANDER HV_U
Warning message ................ 226
Parking lights Light switch .......................... 229
Replacing light bulbs ............ 443
Parking Support Brake function (for rear-crossing vehicles) . 312Function ............................... 312
Parking Support Brake function (static objects) ...................... 306Function ............................... 306
PCS (Pre-Collision System) Function ............................... 249
PCS OFF switch................... 251
Warning light ........................ 466
Personal lights ....................... 356
PKSB (Parking Support Brake) ............................................... 299Warning message ................ 304
Power control unit .................... 75
Power control unit coolant Capacity ............................... 509
Checking .............................. 413
Preparing and c hecking before
winter.................................. 327
Power outlets .................. 377, 378
Power steering (Electric power steering system)................... 320Warning light ........................ 463
Power switch .......................... 213 Auto power off function ........ 216
Changing the power switch modes ................................ 216
Power switch ( engine switch)
If your vehicle has to be stopped in an emergency................. 452
Power windows Door lock linked window opera-tion ..................................... 180
Jam protection function ........ 179
Operation ............................. 179
Window lock switch .............. 181 Pre-Collision System (PCS)
Function................................249
PCS OFF switch ...................251
Warning light.........................466
Predictive deceleration support .................................................74
Predictive SOC control ............74
R
Radar cruise control (dynamic radar cruise control with
full-speed range)...................270
Radiator ...................................414
RCTA Function................................294
Warning message.................295
RCTA function .........................296
Rear automatic air conditioning system ...................................348
Rear Cross Traffic Alert (RCTA) ...............................................294
Rear door sunshades .............383
Rear fog lights Switch ...................................235
Rear seats ...............................154 Head restraints .....................162
Seat heaters ....... ..................352
Rear side marker lights Light switch...........................229
Replacing light bulbs ............443
Rear turn signal lights Replacing light bulbs ............443
Turn signal lever ...................223
Rear view mirror Digital Rearview Mirror .........167
Inside rear view mirror ..........166
Outside rear view mirrors .....177
Rear window defogger ...338, 342
Refueling Capacity ...............................507
Fuel types .............................507