2013 TOYOTA PRIUS coolant temperature

220 2-2. Instrument cluster
PRIUS_OM_OM47791U_(U)
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. 556)
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

431
4-3. Do-it-yourself maintenance
PRIUS_OM_OM47791U_(U)
4
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-borate coolant
with long-life hybrid organic acid technology.
U.S.A.: “Toyota Super Long Life Coolant” is a mixture of 50% cool- ant and 50% deionized water. (Minimum temperature: -31 F
[-35 C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% cool- ant and 45% deionized 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 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.

500 5-2. Steps to take in an emergency
PRIUS_OM_OM47791U_(U)
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.

556
5-2. Steps to take in an emergency
PRIUS_OM_OM47791U_(U)
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. 500) 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. 520) is shown on the
multi-informat ion display.
● Steam comes out from under the hood.
STEP 1
STEP 2
STEP 3

5
When trouble arises
557
5-2. Steps to take in an emergency
PRIUS_OM_OM47791U_(U)
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

633
Alphabetical index
PRIUS_OM_OM47791U_(U)
Tonneau cover......................... 382
Tools......................................... 530
Touch tracer display ............... 217
Total load capacity .................. 320
Towing
Dinghy towing ....................... 327
Emergency towing ................ 492
Trailer towing ........................ 326
TRAC ........................................ 300
Traction control ....................... 300
Trailer towing........................... 326
Transmission
Hybrid transmission .............. 204
P position switch................... 207
Trip information....................... 231
Trip meter................................. 216
Turn signal lights Replacing light bulbs ............ 473
Switch ................................... 213
Wattage ................................ 576
USB port
*................................ 356
Vanity lights Vanity lights .......................... 369
Wattage ................................ 576
Vanity mirrors .......................... 369
Vehicle data recordings............ 24
Vehicle identification number................................... 567
Vehicle proximity notification system ..................................... 34
Vehicle stability control .......... 300
VSC ........................................... 300 Warning buzzers
Brake system ........................499
Open door ............................504
Seat belt reminder .................504
Warning lights Anti-lock brake system
(ABS) ..................................501
Automatic headlight leveling system ................................503
Brake system ................499, 502
Charging system .... ...............500
Cruise control ........................503
Electric power steering
system ................................501
High coolant temperature ......500
Hybrid system .......................501
Low fuel level ........................504
Low tire pressure...................505
Malfunction indicator lamp ....501
Open door .............................504
Pre-collision system ..............502
Radar cruise control. .............503
Seat belt warning light ...........504
Slip indicator..........................502
SRS airbags ..........................501
Tire pressure warning light ....505U
V
W
GW Refer to

635
PRIUS_OM_OM47791U_(U)
What to do if...
What to do if...
A tire puncturesP. 530If you have a flat tire
The hybrid system does not start
P. 545If the hybrid system will not start
P. 138Immobilizer system
P. 550If 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. 556If your vehicle overheats
The key is lostP. 547If you lose your keys
The 12-volt battery runs outP. 550If the 12-volt battery is
discharged
The doors cannot be lockedP. 8 9Side doors
P. 9 5Back door
The vehicle is stuck in mud or
sandP. 561If the vehicle becomes stuck
A warning light or indicator
light comes onP. 499If a warning light turns on or a
warning buzzer sounds

636 What to do if...
PRIUS_OM_OM47791U_(U)
■Warning lights
P. 505
or
P. 501
or
P. 499P. 501
P. 500P. 502
P. 500P. 502
P. 502
or
P. 501P. 503
P. 501P. 503
Master warning light ABS warning light
Brake system warning
light (red indicatorF
Electric power steering
system warning light
Charging system
warning lightPre-collision system
warning light
G
High coolant
temperature warning
lightSlip indicator light
Brake system warning
light (yellow indicator)Malfunction indicator
lamp
Automatic headlight
leveling system
warning light
SRS warning lightCruise control indicator
light
G