radiator TOYOTA AYGO 2021 Owners Manual

3877-3. Do-it-yourself maintenance
7
Maintenance and care
AYGO_OM_Europe_OM9A012E
Do-it-yourself service precautions
If you perform maintenance by yourself, be sure to follow the
correct procedure as given in these sections.
ItemsParts and tools
Battery condition
(P. 399)•Warm water• Baking soda•Grease
• Conventional wrench (for terminal clamp bolts)
Engine coolant
level (P. 397)
• “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
“Toyota Super Long Life Coolant” is pre-mixed with
50% coolant and 50% deionized water.
• Funnel (used only for adding coolant)
Engine oil level
(P. 394)• “Toyota Genuine Motor Oil” or equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses (P. 4 1 8 )• Fuse with same amperage rating as original
Light bulbs
(P. 426)
• Bulb with same number and wattage rating as origi-
nal
• Phillips-head screwdriver
• Flathead screwdriver•Wrench
Radiator and
condenser
(P. 398)

Tire inflation
pressure
(P. 410)• Tire pressure gauge
• Compressed air source
Washer fluid
(P. 402)• Water or washer fluid containing antifreeze (for win-
ter use)
• Funnel (used only for adding water or washer fluid)

3887-3. Do-it-yourself maintenance
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WARNING
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become el ectrically energized. To avoid death
or serious injury, observe the following precautions.
■ When working on the engine compartment
● Keep hands, clothing and tools away from the moving fan and engine
drive belt.
● Be careful not to touch the engine, 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 rags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel or the bat-
tery. Fuel and battery fumes are flammable.
● Be extremely cautious when working on the battery. It contains poisonous
and corrosive sulfuric acid.
● Take care because brake fluid can harm your hands or eyes and damage
painted surfaces. If fluid gets on your hands or in your eyes, flush the
affected area with clean water immediately.
If you still experience discomfort, consult a doctor.
■ When working near the electric cooling fans or radiator grille
Vehicles without a smart entry & start system
Be sure the engine switch is off. With the engine switch in the “ON” position,
the electric cooling fan may automatical ly start to run if the air conditioning
is on and/or the coolant temperature is high. ( P. 398)
Vehicles with a smart entry & start system
Be sure the engine switch is off. With the engine switch in IGNITION ON
mode, the electric cooling fan may automatically start to run if the air condi-
tioning is on and/or the coolant temperature is high. ( P. 398)
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc.,
from getting in your eyes.

3937-3. Do-it-yourself maintenance
7
Maintenance and care
AYGO_OM_Europe_OM9A012E
Engine compartment
Engine oil filler cap
(P. 395)
Fuse box (P. 418)
Battery (P. 399)
Engine coolant reservoir
(P. 397)Radiator (P. 398)
Electric cooling fan
Condenser (P. 398)
Engine oil level dipstick
(P. 394)
Washer fluid tank (P. 402)1
2
3
4
5
6
7
8
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3977-3. Do-it-yourself maintenance
7
Maintenance and care
AYGO_OM_Europe_OM9A012E
The coolant level is satisfactory if it is between the “FULL” or “F” and
“LOW” lines on the reservoir when the engine is cold.
Ty pe A
Reservoir cap
“FULL” line
“LOW” line
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
Ty pe B
Reservoir cap
“F” line
“LOW” line
If the level is on or below the
“LOW” line, add coolant up to the
“F” line.
■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-borate coolant with
long-life hybrid organic acid technology.
“Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50%
deionized water. (Minimum temperature: -35C [-31F])
For more details about coolant, contact any authorized Toyota retailer or Toy-
ota authorized repairer, or any reliable repairer.
■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 any authorized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer, test the cap and check for leaks in the
cooling system.
Engine coolant
1
2
3
1
2
3

3987-3. Do-it-yourself maintenance
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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 any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
WARNING
■ When the engine is hot
Do not remove 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 engine is hot
Do not touch the radiator or condenser as they may be hot and cause seri-
ous injuries, such as burns.

5048-2. Steps to take in an emergency
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If your vehicle overheats
●The high engine coolant temperature warning light (P. 450) comes
on or flashes, or a loss of engine power is experienced. (For exam-
ple, the vehicle speed does not increase.)
● Steam comes out from under the hood.
Stop the vehicle in a safe place and turn off the air conditioning sys-
tem, and then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled
down sufficiently, inspect the
hoses and radiator core (radia-
tor) for any leaks.
Radiator
Cooling fan
If a large amount of coolant
leaks, immediately contact any
authorized Toyota retailer or
Toyota authorized repairer, or
any reliable repairer.
The following may indicate that your vehicle is overheating.
Correction procedures
1
2

5058-2. Steps to take in an emergency
8
When trouble arises
AYGO_OM_Europe_OM9A012E
The coolant level is satisfactory if it is between the “FULL” or “F”
and “LOW” lines on the reservoir.
Radiator cap
Reservoir
“FULL” or “F”
“LOW”
Add coolant if necessary.
Water can be used in an emer-
gency if coolant is unavailable.
Start the engine and turn the air conditioning system on to check
that the radiator cooling fan operate and to check for coolant leaks
from the radiator or hoses.
The fan operate when the air conditioning system is turned on immediately
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.)
Ty pe ATy pe B
1
2
3
4

5068-2. Steps to take in an emergency
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If the fan is not operating:
Stop the engine immediately and contact any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
If the fan is operating:
Have the vehicle inspected at the nearest any authorized Toyota
retailer or Toyota authorized repairer, or any reliable repairer.
WARNING
■ When inspecting under the hood of your vehicle
Observe the following precautions.
Failure to do so may result in serious injury such as burns.
● 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.
● Keep hands and clothing (especially a tie, a scarf or a muffler) away from
the fan and belts. Failure to do so may cause the hands or clothing to be
caught, resulting in serious injury.
● Do not loosen the radiator cap while the engine 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 sufficiently. 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 precautions:
● Avoid contaminating the coolant with foreign matter (such as sand or dust,
etc.).
● Do not use any coolant additives.

538Alphabetical index
AYGO_OM_Europe_OM9A012E
Radiator .................................... 398
Radio ......................................... 296
Radio data system ................... 298
RDS ........................................... 298
Rear fog lights.......................... 235
Replacing light bulbs ............. 432
Switch ................................... 235
Wattage................................. 520
Rear seat................................... 185
Folding down the rear
seatbacks ........................... 185
Head restraints...................... 187
Rear turn signal lights ............. 229
Replacing light bulbs ............. 432
Turn signal lever ................... 229
Wattage................................. 520
Rear view mirror
Inside rear view mirror .......... 191
Outside rear view mirrors ...... 192
Rear view monitor system
*
Rear window defogger .... 354, 360
Rear window wiper .................. 239
Refueling .................................. 241
Capacity ................................ 512
Fuel types ..................... 241, 512
Opening the fuel tank cap ..... 243
Replacing
Electronic key battery............ 415
Fuses .................................... 418
Light bulbs............................. 426
Tires .............................. 459, 481
Wireless remote control
battery................................. 415Seat belts.................................... 32
Child restraint system
installation ............................ 67
Cleaning and maintaining
the seat belt........................ 383
Emergency Locking
Retractor............................... 33
How to wear your seat belt ..... 32
How your child should wear
the seat belt.......................... 33
Pregnant women, proper
seat belt use ......................... 34
Reminder light and buzzer .... 453
Seat belt pretensioners ........... 33
SRS warning light ................. 451
Seat heaters ............................. 364
Seats ................................. 183, 185
Adjustment ............................ 183
Adjustment
precautions................. 184, 186
Child seats/child restraint
system installation ................ 67
Cleaning................................ 382
Folding down the rear
seatbacks ........................... 185
Head restraint ....................... 187
Properly sitting in the seat ...... 30
Seat heaters ......................... 364
RS