cooling TOYOTA AVALON HYBRID 2020 Owners Manual (in English)

781-3. Hybrid system
■Sounds and vibrations sp ecific to a hybrid vehicle
There may be no engine sound or vibration even though the vehic le is able to
move with the “READY” indicator is illuminated. For safety, app ly the parking
brake and make sure to shift the shift lever to P when parked.
The following sounds or vibrations may occur when the hybrid sy stem is
operating and are not a malfunction:
● Motor sounds may be heard from the engine compartment.
● Sounds may be heard from the hybrid battery (traction battery) under the
rear seats when the hybrid system starts or stops.
● Relay operating sounds such as a snap or soft clank will be emi tted from the
hybrid battery (traction battery), under the rear seats, when the hybrid sys-
tem is started or stopped.
● Sounds from the hybrid system may be heard when the trunk lid is open.
● Sounds may be heard from the transmission when the gasoline engine
starts or stops, when driving at low speeds, or during idling.
● Engine sounds may be heard when accelerating sharply.
● Sounds may be heard due to regenerative braking when the brake pedal is
depressed or as the accelerator pedal is released.
● Vibration may be felt when the gasoline engine starts or stops.
● Cooling fan sounds may be heard from the air intake vent. ( P. 80)
■ Vehicle proximity notification system
In the following cases, the vehicle proximity notification syst em may be diffi-
cult for surrounding people to hear.
● In very noisy areas
● In the wind or the rain
Also, as the vehicle proximity notification system is installed on the front of
the vehicle, it may be more difficult to hear from the rear of the vehicle com-
pared to the front.
■ Maintenance, repair, recycling, and disposal
Contact your Toyota dealer regarding maintenance, repair, recyc ling and dis-
posal. Do not dispose of the vehicle yourself.
■ Customization
Some functions can be customized. ( P. 524)

801-3. Hybrid system
There is an air intake vent under
the right side of the rear seat for
the purpose of cooling the hybrid
battery (traction battery). If the
vent becomes blocked, charging/
discharging of the hybrid battery
(traction battery) may become lim-
ited.
When a certain level of impact is detected by the impact sensor , the
emergency shut off system blocks the high voltage current and stops
the fuel pump to minimize the ri sk of electrocution and fuel leakage. If
the emergency shut off system activates, your vehicle will not restart.
To restart the hybrid system , contact your Toyota dealer.
A message is automatically displ ayed when a malfunction occurs in
the hybrid system or an improper operation is attempted.
If a warning message is shown on
the multi-information display, read
the message and follow the
instructions. ( P. 463)
Hybrid battery (traction battery) air intake vent
Emergency shut off system
Hybrid warning message

3224-5. Using the driving support systems
■Operation of the air conditioning system in Eco drive mode
Eco drive mode controls the heating/cooling operations and fan speed of the
air conditioning system to enhance fuel efficiency ( P. 338). To improve air
conditioning performance, adjust the fan speed or turn off Eco drive mode.
■ Auto Glide Control
When Auto Glide Control operates, the AGC indicator light will illuminate.
● Auto Glide Control may not operate in the following situations:
• When the brake pedal is depressed
• When a shift position other than D is selected
• When the vehicle speed is approximately 10 mph (15 km/h) or lo wer
• When the vehicle is accelerating on a downward slope
• When the PCS (Pre-Collision System) is operating
• When the dynamic radar cruise control with full-speed range is operating
• When the Intelligent Clearance Sonar system is operating
• When the TRAC or VSC system is operating
• When the TRAC or VSC system is disabled by pressing the VSC OF F
switch
■ Sport mode automatic deactivation
Sport mode is automatically deactivated if the power switch is turned off after
driving in sport mode. ● While driving in Eco drive mode with D
selected, releasing the accelerator
pedal will activate Auto Glide Control
under certain conditions. (Auto Glide
Control may activate before the acceler-
ator pedal is fully released.)
When Auto Glide Control operates, the
electric motor (traction motor) will be
controlled, reducing the deceleration
force and allowing the vehicle to coast,
enhancing fuel economy.

3405-1. Using the air conditioning system and defogger
Adjust the driver’s side tem-
perature setting
Adjust the fan speed setting
Select the air flow mode
*
Adjust the front passenger’s
side temperature setting
Display the option control
screen (P. 341)
Turn automatic mode on/off
Turn the fan off
Turn cooling and dehumidifi cation function on/off
If the indicator is turned off, the system will blow ambient t em-
perature air or heated air.
Change the temperature setting between individual/synchronized
mode. ( P. 338)
Enable/Disable S-FLOW mode ( P. 341)
*: — Air flows to the upper body
— Air flows to the upper body and feet
— Air flows to the feet
— Air flows to the feet and the windshield defogger operates
Control screen
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3415-1. Using the air conditioning system and defogger
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Interior features
■Option control screen
Select on the air conditioning control screen to display the
option control screen. The funct ions can be switched on and off.
When the function is on, the indicator illuminates on the scree n.
Select to change the tem-
perature setting between
individual/synchronized
mode (P. 338)
Select to set cooling and
dehumidification function on/
off
Select the S-FLOW mode
(  P. 341)
■Using the automatic mode
Press or select on the air conditioning control
screen.
The dehumidification function begins to operate. Air outlets an d
fan speed are automatically adjusted according to the tempera-
ture setting.
Adjust the temperature setting.
To stop the operation, press or select on the air
conditioning control screen.
■Automatic mode indicator
If the fan speed setting or air flow modes are operated, the au to-
matic mode indicator goes off. However, automatic mode for func -
tions other than that o perated is maintained.
■S-FLOW mode
When the air conditioning system is operating in S-FLOW mode, a ir
conditioner efficiency will be enhanced by concentrating the ai rflow
on occupied seats only.
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Air conditioning controls
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3465-1. Using the air conditioning system and defogger
■Windshield fog detection function
When automatic mode is set, the humidity sensor (P. 348) detects fog on
the windshield and controls the air conditioning system to prev ent fog.
■ When driving on dusty roads
Close all windows. If dust thrown up by the vehicle is still drawn into the vehi-
cle after closing the windows, it is recommended that the air i ntake mode be
set to outside air mode and the fan speed to any setting except off.
■ Outside/recirculated air mode
●Setting to the recirculated air mode temporarily is recommended in prevent-
ing dirty air from entering the vehicle interior and helping to cool the vehicle
when the outside air temperature is high.
● Outside/recirculated air mode may automatically switch dependin g on the
temperature setting or the inside temperature.
■ When the outside temperature exceeds 75°F (24°C) and the air co ndition-
ing system is on
● In order to reduce the air conditioning power consumption, the air condition-
ing system may switch to recirculated air mode automatically. This may also
reduce fuel consumption.
● Recirculated air mode is selected as a default mode when the power switch
is turned to ON mode.
● It is possible to switch to outside air mode at any time by pre ssing .
■ When the outside t emperature is low
The dehumidification function may not operate even when is pre ssed
or is selected.
■ Operation of the air conditioning system in Eco drive mode
●In the Eco drive mode, “ECO” is displayed on the air conditioni ng screen
and the air conditioning system is controlled as follows to pri oritize fuel effi-
ciency:
• Engine speed and compressor operation controlled to restrict h eating/
cooling capacity
• Fan speed restricted when automatic mode is selected
● To improve air conditioning performance, perform the following operations:
• Adjust the fan speed
• Turn off Eco drive mode

4006-3. Do-it-yourself maintenance
Tire inflation
pressure
( P. 427)• Tire pressure gauge
• Compressed air source
Washer fluid
( P. 410)• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)
WARNING
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury, observe the following precautions.
■ When working on the engine compartment
● Make sure that the “ACCESSORY” or “IGNITION ON” on the multi-in for-
mation display and the “READY” indicator are both off.
● Keep hands, clothing and tools away from the moving fan and eng ine
drive belt.
● Be careful not to touch the engine, power control unit, radiator, exhaust
manifold, etc. right after driving as they may be hot. Oil and other fluids
may also be hot.
● Do not leave anything that may burn easily, such as paper and r ags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes
are flammable.
■ When working near the electric cooling fan or radiator grille
Be sure the power switch is off.
With the power switch in ON mode, the electric cooling fan may automati-
cally start to run if the air conditioning is on and/or the coo lant temperature
is high. ( P. 408)
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.
from getting in your eyes.
NOTICE
■If you remove the air cleaner filter
Driving with the air cleaner filter removed may cause excessive engine wear
due to dirt in the air.
ItemsParts and tools

4036-3. Do-it-yourself maintenance
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Maintenance and care
Engine compartment
Fuse boxes (P. 441)
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 vehic le inspected by your Toyota dea ler.
WARNING
■When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir c aps 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 cor rect 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 p arts 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 c ause seri-
ous injuries, such as burns.

4346-3. Do-it-yourself maintenance
Remove the dust from the air
intake vent with a vacuum
cleaner, etc.
Make sure to only use a vacuum to
suck out dust and clogs. Attempt-
ing to blow out dust and clogs
using an airgun, etc. may push it
into the air intake vent. (P. 4 3 8 )
If dust and clogs cannot be completely removed with the air int ake
vent cover installed, remove t he cover and clean the filter.
Turn the power switch off.
Using a Phillips screwdriver,
remove the clip.
Cleaning the hybrid batter y (traction bat-
ter y) air intake vent and filter
To prevent the fuel economy from being affected, visually
inspect the hybrid battery (traction battery) air intake vent p eri-
odically for dust and clogs. If i t is dusty or clogged or if “Mainte-
nance Required for Traction Battery Cooling Parts See Owner’s
Manual” is displayed on the multi-information display, clean the
air intake vent using the following procedures:
Cleaning the air intake vent
If dust and clogs cannot be completely removed
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