Get Steps to take in an emergency -> If your vehicle overheats Guide for Toyota Prius 4 Door Fourth Generation (2016-2022)

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7-2. Steps to take in an emergency

If your vehicle overheats

The following may indicate that your vehicle is overheating.

● The high coolant temperature warning light (P. 582) comes on

or flashes, or a loss of hybrid system power is experienced. (For

example, the vehicle speed does not increase.)

● “Hybrid System Overheated” is shown on the multi-information

display.

● Steam comes out from under the hood.

Correction procedures

■ If the high coolant temperature warning light comes on or

flashes

1

Stop the vehicle in a safe place and turn off the air conditioning

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 radiator core (radiator) for any leaks.

1

2

Radiator

Cooling fans

If a large amount of coolant

leaks, immediately contact

your Toyota dealer.

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7-2. Steps to take in an emergency

4

The coolant level is satisfactory if it is between the “FULL” and

“LOW” lines on the reservoir.

1

Reservoir

“FULL” line

“LOW” line

2

3

5

Add coolant if necessary.

Water can be used in an emer-

gency if coolant is unavailable.

6

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 the 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 by 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.)

7

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 nearest Toyota dealer.

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7-2. Steps to take in an emergency

■ If “Hybrid System Overheated” is shown on the multi-informa-

tion display

1

Stop the vehicle in a safe place.

2

Stop the hybrid system and carefully lift the hood.

3

After the hybrid system has cooled down, inspect the hoses and

radiator core (radiator) for any leaks.

1

2

Radiator

Cooling fans

If a large amount of coolant

leaks, immediately contact

your Toyota dealer.

4

The coolant level is satisfactory if it is between the “FULL” and

“LOW” lines on the reservoir.

1

Reservoir

“FULL” line

“LOW” line

2

3

5

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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7-2. Steps to take in an emergency

6

After stopping the hybrid system and waiting for 5 minutes or

more, start the hybrid system again and check if “Hybrid System

Overheated” is shown on 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 message appears again frequently, contact your Toyota

dealer.

WARNING

■To prevent an accident or injury 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.

●After the hybrid system has been turned off, check that the “Accessory”,

“Ignition ON” or mileage display (P. 116) on the main display and the

“READY” indicator are off.

When the hybrid system is operating, the gasoline engine may automati-

cally start, or the cooling fans 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.

7

●Do not loosen the coolant reservoir caps while the hybrid system and radi-

ator are hot.

High temperature steam or coolant could spray out.

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7-2. Steps to take in an emergency

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.

■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 additive.

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Steps to take in an emergency -> If your vehicle overheats for Your Toyota Prius 4 Door Fourth Generation (2016-2022)

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