coolant level TOYOTA PRIUS 2020 Owners Manual (in English)

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6-2. Maintenance
General maintenance
Listed below are the general maintenance items that should be
performed at the intervals specified in the “Owner’s Warranty
Information Booklet” or “Own er’s Manual Supplement/Sched-
uled Maintenance Guide”. It is recommended that any problem
you notice should be brought to the attention of your Toyota
dealer or qualified s ervice shop for advice.
Engine compartment
ItemsCheck points
12-volt batteryCheck the connections. (P. 512)
Brake fluidIs the brake fluid at the correct level? ( P. 516)
Engine/power control
unit coolantIs the engine/power control unit coolant at the
correct level? (P. 510)
Engine oilIs the engine oil at the correct level? (P. 507)
Exhaust systemThere should not be any fumes or strange
sounds.
Radiator/condenserThe radiator and condenser should be free from
foreign objects. (P. 512)
Washer fluidIs there sufficient washer fluid? (P. 518)

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6-3. Do-it-yourself maintenance
Do-it-yourself ser vice precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
12-volt battery
condition
(  P. 5 1 2 )•Grease
• Conventional wrench (for terminal clamp bolts)
Brake fluid level
( P. 5 1 6 )
• SAE J1703 or FMVSS No.116 DOT 3 or SAE J1704
or FMVSS No.116 DOT 4 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine/power
control unit cool-
ant level
( P. 5 1 0 )
• “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
For the U.S.A.:
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
For Canada:
“Toyota Super Long Life Coolant” is pre-mixed with
55% coolant and 45% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
( P. 5 0 7 )• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses ( P. 551)• Fuse with same amperage rating as original
Hybrid battery
(traction battery)
air intake vent
( P. 5 3 9 )• Vacuum cleaner, etc.
• Phillips screwdriver
Light bulbs
( P. 5 5 6 )
• Bulb with same number and wattage rating as origi-
nal
• Phillips screwdriver
• Flathead screwdriver• Wrench
Radiator and con-
denser ( P. 512)

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6-3. Do-it-yourself maintenance
Engine compartment
Engine coolant reservoir ( P. 510)
Fuse boxes ( P. 551)
Engine oil level dipstick ( P. 507)
Engine oil filler cap ( P. 508)
Brake fluid reservoir ( P. 516) 12-volt battery (
P. 512)
Power control unit coolant
reservoir ( P. 510)
Radiator ( P. 512)
Condenser ( P. 512)
Electric cooling fans
Washer fluid tank ( P. 518)1
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510
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6-3. Do-it-yourself maintenance
The coolant level is satisfactory if it is between the “FULL” a nd “LOW”
lines on the reservoir when the hybrid system is cold.
■Engine coolant reservoir
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the
“LOW” line, add coolant up to
the “FULL” line. ( P. 644)
■
Power control unit coolant reservoir Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the
“LOW” line, add coolant up to
the “FULL” line. ( P. 646)
Coolant
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5116-3. Do-it-yourself maintenance
6
Maintenance and care
■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-bora te coolant with
long-life hybrid organic acid technology.
U.S.A.:
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deion-
ized water. (Minimum temperature: -31 F [-35 C])
Canada:
“Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deion-
ized water. (Minimum temperature: -44 F [-42 C])
For more details about coolant, contact your Toyota dealer.
■ If the coolant level drops within a short time of replenishing
Visually check the radiator, hoses, engine/power control unit c oolant 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 system.
WARNING
■ When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir c aps.
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.

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7
When trouble arises
7-2. Steps to take in an emergency
If you think something is wrong
●Fluid leaks un der the vehicle
(Water dripping from the air conditioning a fter use is normal.)
● Flat-looking tires or uneven tire wear
● High coolant temperature warni ng light flashes or comes on
● Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the hybrid system
● Engine missing, stumb ling or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one s ide when driving on a level road
● Loss of brake effectiveness, spongy feeling, pedal almost touch es
the floor
If you notice any of the followi ng symptoms, your vehicle proba -
bly needs adjustment or repair. Contact your Toyota dealer as
soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

5827-2. Steps to take in an emergency
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High coolant temperature warning light• When the light flashes:Indicates that the engine coolant temperature is too high
The light changes from a flashing to a solid light when
the temperature further increases
 Immediately stop the vehicle in a safe place. ( P. 644)
• When the light comes on without flashing: Indicates a malfunction in the exhaust heat recirculator
system
 Have the vehicle inspected by your Toyota dealer
immediately.
(Flashes)
(If equipped)
PKSB OFF indicator
Indicates a malfunction in the Parking Support Brake func-
tion
 Have the vehicle inspected by your Toyota dealer.
The warning light will operate as follows, even when the
system is not malfunctioning:
• The light will come on when the Parking Support Brake function is turned off ( P. 363)
• The light will come on when the Parking Support Brake
function is operating ( P. 367)
• The light will flash when the system cannot be temporar- ily used ( P. 371)
Open door warning light (warning buzzer)*3
Indicates that a door is not fully closed
 Check that all the doors are closed.
Low fuel level warning light
Indicates that remaining fuel is approximately 1.7 gal.
(6.4 L, 1.4 Imp.gal.) or less
 Refuel the vehicle.
Driver’s and front passenger’ s seat belt reminder light
(warning buzzer)
*4
Warns the driver and/or front passenger to fasten their
seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front
passenger’s seat belt also needs to be fastened to
make the warning light (warning buzzer) turn off.
Warning lightWarning light/Details/Actions

6457-2. Steps to take in an emergency
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7
When trouble arises
The coolant level is satisfactory if it is between the “FULL” and
“LOW” lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
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 fans operate and to check for
coolant leaks from t he radiator or hoses.
The fans operate when the air conditioning system is turned on immedi-
ately after a cold start. Confirm that the fans are operating b y checking
the fan sound and air flow. If it is difficult to check these, turn the air con-
ditioning system on and off repeatedly. (The fans may not operate in
freezing temperatures.)
If the fans are not operating:
Stop the hybrid system immediately and contact your Toyota
dealer.
If the fans are operating:
Have the vehicle inspected at the neare st Toyota dealer.
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6467-2. Steps to take in an emergency
PRIUS_OM_OM47D44U_(U)■
If “Hybrid System Overheated” is shown on the multi-informa-
tion display
Stop the vehicle in a safe place.
Stop the hybrid system and carefully lift the hood.
After the hybrid system has cooled down, inspect the hoses and
radiator core (radiat or) for any leaks.
Radiator
Cooling fans
If a large amount of coolant
leaks, immediately contact
your Toyota dealer.
The coolant level is satisfactory if it is between the “FULL” a nd
“LOW” lines on the reservoir.
Reservoir
“FULL” line
“LOW” line
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
If water was added in an emer-
gency, have the vehicle inspected
at your Toyota dealer as soon as
possible.
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725Alphabetical index
PRIUS_OM_OM47D44U_(U)
Warning lights.......................... 107ABS....................................... 581
Brake Override System......... 584
Brake system ....... ................. 580
Charging system ................... 580
Drive-Start Control ................ 584
Driver’s seat belt reminder light ..................................... 582
Electronic engine control system ......... ....................... 580
Electric power steering
system ......... ....................... 581
Front passenger’s seat belt reminder light...................... 582
High coolant temperature ..... 582
Low engine oil pressure ........ 580
Low fuel level ........................ 582
Malfunction indicator lamp .... 580
Master warning light.............. 583
Open door ............................. 582
Parking Support Brake function ............................... 584
PCS ...................................... 581
PKSB OFF indicator ............. 582
Rear passengers’ seat belt
reminder light...................... 583
Seat belt reminder light ......... 582
Slip indicator ......................... 581
SRS ...................................... 581
Tire pressure......................... 583 Warning messages.................. 591
Warning reflector storage
space ...................................... 458
Washer ............................. 271, 277 Checking............................... 518
Preparing and checking
before winter ...................... 418
Switch ........................... 271, 277
Washing and waxing ............... 484
Water-repellent coating .......... 485
Weights .................................... 652 Cargo capacity...................... 238
Load limits ............................ 652
Wheels ...................................... 533
Replacing wheels ................. 619
Size....................................... 660
Window glasses ...................... 214
Window lock switch ................ 214
Windows Power windows..................... 214
Rear window
defogger ..................... 428, 438
Washer ......................... 271, 277
Windshield wipers ................... 271 Handling the wiper arms ....... 489
Rain-sensing windshield wipers ................................. 273
Replacing the wiper insert .... 544
Winter driving tips ................... 418
Wiper insert replacement ....... 544
Wireless charger ..................... 465
Wireless remote control ......... 176 Battery-Saving Function ....... 194
Locking/Unlocking ................ 182
Panic mode........................... 177
Replacing the battery............ 548
WMA disc
*1
*1: Refer to “MULTIMEDIA OWNER’S MANUAL”.
*2: Refer to “NAVIGATION S YSTEM OWNER’S MANUAL”.