2015 TOYOTA PRIUS coolant temperature

221
2-2. Instrument cluster
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2
When driving
CAUTION
■
To prevent an accident
NOTICE
■To prevent damage to the engine and its components
The engine may be overheating if the high coolant temperature warning light
comes on or flashes. In this case, immediately stop the vehicle in a safe
place, and check the engine after it has cooled completely. ( P. 561)
Do not place anything or attach a sticker
in front of the instrument cluster. The item
may obscure or obstruct the display, or
could reflect off the display, possibly
causing an accident.Instrument cluster

434 4-3. Do-it-yourself maintenance
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■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.
U.S.A.: “Toyota Super Long Life Coolant” is a mixture of 50% coolant and 50% deionized water. (M inimum temperature: -31F [-35 C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% coolant and 45% deionized water. (M inimum 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 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.
CAUTION
■When the hybrid system is hot
Do not remove the engine/power control unit coolant reservoir caps.
The cooling system may be under pressure and may spray hot coolant if the
cap is removed, causing serious injuries, such as burns.

504 5-2. Steps to take in an emergency
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Stop the vehicle immediately.The following warning indicates the possibility of damage to the vehi-
cle that may lead to an accident. Immediately stop the vehicle in a
safe place and contact your Toyota dealer.
Warning lightWarning light/Details
Charging system warning light Indicates a malfunction in the vehicle’s charging system
High coolant temperature warning light Indicates that the coolant temperature is too high
Changes from a flashing to a solid light when the engine
coolant temperature increases.

5
When trouble arises
561
5-2. Steps to take in an emergency
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If your vehicle overheats
Correction procedures■ If the high coolant temperatur e warning light comes on or
flashes
Stop the vehicle in a safe place and turn off the air condition-
ing system, and then stop the hybrid system.
If you see steam: Carefully lift the hood after the steam subsides.
If you do not see steam: Carefully lift the hood.
After the hybrid system has
cooled down sufficiently, inspect
the hoses and radiator core
(radiator) for any leaks.
Radiator
Cooling fans
If a large amount of coolant leaks,
immediately contact your Toyota
dealer.
The following may indicate that your vehicle is overheating.
●The high coolant temperature warning light ( P. 504) comes on
or flashes, or a loss of hybrid system power is experienced. (For
example, the vehicle s peed does not increase.)
● “HYBRID SYSTEM OVERHEAT” ( P. 525) is shown on the
multi-informat ion display.
● Steam comes out from under the hood.
STEP 1
STEP 2
STEP 3

562 5-2. Steps to take in an emergency
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The coolant level is satisfactory if
it is between the “FULL” and
“LOW” lines on the reservoir.Reservoir
“FULL”
“LOW”
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 the radiator or hoses.
The fans operate when the air conditioning system is turned on
immediately 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 conditioning system on and off repeatedly.
(The fans may not operate in freezing temperatures.)
If the fans are not operating: Stop the hybrid system im mediately and contact your
Toyota dealer.
If the fans are operating: Have the vehicle inspected at the nearest Toyota dealer.
ITO43P111
STEP 4
ITO52P130
STEP 5
STEP 6
STEP7

564 5-2. Steps to take in an emergency
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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.
After stopping the hybrid system and waiting for 5 minutes or
more, start the hybrid system again and check 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
Toyota dealer.
STEP 5
STEP 6

639
Alphabetical index
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Tonneau cover......................... 384
Tools......................................... 537
Touch tracer display ............... 218
Total load capacity .................. 322
Towing
Dinghy towing ....................... 329
Emergency towing ................ 498
Trailer towing ........................ 328
TRAC ........................................ 301
Traction control ....................... 301
Trailer towing........................... 328
Transmission
Hybrid transmission .............. 205
P position switch................... 208
Trip information....................... 232
Trip meter................................. 231
Turn signal lights Replacing light bulbs ............ 478
Switch ................................... 214
Wattage ................................ 582
USB port
*................................ 358
Vanity lights Vanity lights .......................... 371
Wattage ................................ 582
Vanity mirrors .......................... 371
Vehicle data recordings............ 24
Vehicle identification number................................... 573
Vehicle proximity notification system ..................................... 34
Vehicle stability control .......... 301
VSC ........................................... 301 Warning buzzers
Brake system ........................503
Open door ............................508
Seat belt reminder .................508
Warning lights Anti-lock brake system
(ABS) ..................................505
Automatic headlight leveling system ................................507
Brake system ................503, 506
Charging system .... ...............504
Cruise control ........................507
Electric power steering
system ................................505
High coolant temperature ......504
Hybrid system .......................505
Low fuel level ........................508
Low tire pressure...................509
Malfunction indicator lamp ....505
Open door .............................508
Pre-collision system ..............506
Radar cruise control. .............507
Seat belt warning light ...........508
Slip indicator..........................506
SRS airbags ..........................505
Tire pressure warning light ....509U
V
W
GW Refer to

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What to do if...
What to do if...
A tire puncturesP. 537If you have a flat tire
The hybrid system does not start
P. 550If the hybrid system will not start
P. 137Immobilizer system
P. 555If the 12-volt battery is
discharged
The high coolant temperature
warning light flashes or comes on
“HYBRID SYSTEM OVERHEAT”
is displayed
Steam can be seen coming
from under the hood
P. 561If your vehicle overheats
The key is lostP. 552If you lose your keys
The 12-volt battery runs outP. 555If the 12-volt battery is
discharged
The doors cannot be lockedP. 8 8Side doors
P. 9 4Back door
The vehicle is stuck in mud or
sandP. 567If the vehicle becomes stuck
A warning light or indicator
light comes onP. 503If a warning light turns on or a
warning buzzer sounds