PRIUS_OM_OM47E09U_(U)
5236-3. 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. 
PRIUS_OM_OM47E09U_(U)
5316-3. Do-it-yourself maintenance
6
Maintenance and care
■Using the gauge (if equipped)
The washer fluid level can be checked by
observing  the  position  of  the  level  on  the
liquid-covered holes in the gauge.
If  the  level  falls  below  the  second  hole
from the bottom (the “LOW” position), refill
the washer fluid.
WARNING
■When adding washer fluid
Do  not  add  washer  fluid  when  the  hybrid  system  is  hot  or  operat ing  as
washer fluid contains alcohol and may catch fire if spilled on  the engine etc.
NOTICE
■Do not use any fluid ot her than washer fluid 
Do not use soapy water or engine antifreeze instead of washer f luid.
Doing so may cause streaking on the vehicle’s painted surfaces,  as well as
damaging the pump leading to problems of the washer fluid not s praying.
■ Diluting washer fluid
Dilute washer fluid with water as necessary. 
Refer to the freezing temperatures listed on the label of the washer fluid bot-
tle.
Current 
fluid level