2021 TOYOTA AVALON HYBRID radiator cap

4036-3. Do-it-yourself maintenance
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Maintenance and care
Engine compartment
Fuse boxes (P. 442)
Engine oil filler cap (P. 405)
Engine oil level dipstick
(P. 404)
Brake fluid reservoir
(P. 409)
Radiator (P. 408)Electric cooling fan
Condenser (P. 408)
Power control unit
coolant reservoir (P. 407)
Engine coolant reservoir
(P. 407)
Washer fluid tank (P. 410)1
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4086-3. Do-it-yourself maintenance
■If the coolant level drops within a short time of replenishing
Visually check the radiators, hoses, engine/power control unit coolant reser-
voir 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 system.
Check the radiator and condenser and clear away any foreign objects.
If either of the above parts is extremely dirty or you are not sure of
their condition, have your vehicle inspected by your Toyota dealer.
WARNING
■When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps or the
radiator cap.
The cooling system may be under pressure and may spray hot coolant 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.
Radiator and condenser
WARNING
■When the hybrid system is hot
Do not touch the radiator or condenser as they may be hot and cause seri-
ous injuries, such as burns.

4957-2. Steps to take in an emergency
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When trouble arises
The coolant level is satisfactory
if it is between the “F” and “L”
lines on the reservoir.
Reservoir
“F” line
“L” line
Radiator cap
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the hybrid system and turn the air conditioning system on to
check that the radiator cooling fan operates and to check for cool-
ant leaks from the radiator or hoses.
The fan operates when the air conditioning system is turned on immedi-
ately after a cold start. Confirm that the fan is operating by checking 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 operate in freezing tem-
peratures.)
If the fan is not operating:
Stop the hybrid system immediately and contact your Toyota dealer.
If the fan is operating:
Have the vehicle inspected at the nearest Toyota dealer.
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4977-2. Steps to take in an emergency
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When trouble arises
After stopping the hybrid system and waiting for 5 minutes or
more, start the hybrid system again and check for the multi-infor-
mation 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 message appears again frequently, contact your To y o t a
dealer.
WARNING
■To prevent an accident or injury when inspecting under the hood of
your vehicle
Observe the following precautions.
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●If steam is seen coming from under the hood, do not open the hood until
the steam has subsided. The engine compartment may be very hot.
●After the hybrid system has been turned off, check that the “READY” indi-
cator is off. When the hybrid system is operating, the gasoline engine may
automatically start, or the cooling 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 muf-
fler) getting caught, resulting in serious injury.
●Do not loosen the radiator cap and the coolant reservoir 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
Wait until the hybrid system has cooled down before adding engine/power
control unit coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid sys-
tem too quickly can cause damage to the hybrid system.
■To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust
etc.).
●Do not use any coolant additives.
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553Alphabetical index
Radar cruise control
(dynamic radar cruise
control with full-speed
range) ..................................... 263
Radiator .................................... 408
Rear Camera Detection
Function ................................. 288
Rear Cross Traffic Alert .......... 283
Rear Cross Traffic
Auto Brake ............................. 302
Rear passengers’ seat belt
reminder light ........................ 458
Rear personal lights ................ 353
Rear seat
Folding down ........................ 157
Rear seat heaters..................... 349
Rear side marker lights
Light switch ........................... 218
Replacing light bulbs............. 445
Rear turn signal lights
Replacing light bulbs............. 445
Turn signal lever ................... 211Rear view mirror
Inside rear view mirror .......... 168
Outside rear view mirrors ..... 170
Rear window defogger ............ 343
Refueling .................................. 230
Capacity................................ 504
Fuel types ..................... 504, 510
If the fuel filler door
cannot be opened .............. 234
Opening the fuel tank cap..... 233
Replacing
Electronic key battery ........... 439
Fuses .................................... 442
Light bulbs ............................ 445
Tires...................................... 471
Reporting safety defects
for U.S. owners...................... 538
Resetting the message
indicating maintenance is
required.................................. 393
Road accident cautions ............ 83
R
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM
OWNER’S MANUAL”.