2010 TOYOTA PRIUS coolant level

261
2-5. Driving information
2
When driving
PRIUS_U (OM47668U) U.S.A.
Winter driving tips
Carry out the necessary preparations and inspections before driving
the vehicle in winter. Always drive the vehicle in a manner appropri-
ate to the prevailing weather conditions.
■ Pre-winter preparations
●Use fluids that are appropriate to the prevailing outside tem-
peratures.
• Engine oil
• Engine/power control unit coolant
• Washer fluid
● Have a service technician inspect the level and specific grav-
ity of 12 volt battery electrolyte.
● Have the vehicle fitted with four snow tires or purchase a set
of tire chains for the front tires.
Ensure that all tires are the same size and brand, and that chains
match the size of the tires.

412
4-2. Maintenance
PRIUS_U (OM47668U) U.S.A.
General maintenance
Engine compartment
Luggage compartment
ItemsCheck points
Brake fluid • At the correct level? (P. 432)
Engine/power control unit coolant • At the correct level? ( P. 430)
Engine oil • At the correct level? (P. 426)
Exhaust system • No fumes or strange sounds?
Radiator/condenser/hoses • Not blocked with foreign matter?

( P. 432)
Washer fluid • At the correct level? (P. 434)
ItemsCheck points
12 volt battery • Maintenance-free ( P. 436)
Listed below are the general maintenance items that should be per-
formed at the intervals specified in the “Scheduled Maintenance
Guide” or “Owner’s Manual Supple ment”. It is recommended that
any problem you notice should be brought to the attention of your
Toyota dealer or qualified service shop for advice.
Listed below are the general maintenance items that should be per-
formed at the intervals specified in the “Owner’s Warranty Informa-
tion”. It is recommended that an y problem you notice should be
brought to the attention of your Toyota dealer or qualified service
shop for advice.

416
PRIUS_U (OM47668U) U.S.A.
4-3. Do-it-yourself maintenance
Do-it-yourself ser vice precautions
If you perform maintenance yourself, be sure to follow the correct
procedure given in these sections.
ItemsParts and tools
12 volt battery condition (P. 436)• Grease
• Conventional wrench 
(for terminal clamp bolts)
Engine/power control unit coolant
level 
(P. 430)
• “Toyota Super Long Life Coolant”
or similar high quality ethylene
glycol based non-silicate, non-
amine, non-nitrite and non-borate
coolant with long-life hybrid
organic acid technology.
For the U.S.A.: 
“Toyota Super Long Life Cool-
ant” is pre-mixed with 50 % cool-
ant and 50 % deionized water.
For Canada: 
“Toyota Super Long Life Cool-
ant” is pre-mixed with 55 % cool-
ant and 45 % deionized water.
• Funnel (used only for adding cool- ant)

425
4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS_U (OM47668U) U.S.A.
Engine compar tment
■12 volt battery
 P. 436
Engine coolant reservoir 
(  P. 430)
Engine oil level dipstick 
(  P. 426)
Engine oil filler cap 
(  P. 427)
Power control unit coolant
reservoir ( P. 430)Brake fluid reservoir 
(  P. 432)
Fuse box ( P. 462)
Radiator ( P. 432)
Condenser ( P. 432)
Electric cooling fans
Washer fluid tank 
( P. 434)

430 4-3. Do-it-yourself maintenance
PRIUS_U (OM47668U) U.S.A.
Engine/power control unit coolantThe coolant level is satisfactory if it is between the “FULL” and “LOW”
lines on the reservoir when the hybrid system is cold.
Engine coolant reservoir Reservoir cap
“FULL”
“LOW”
If the level is on or below the
“LOW” line, add coolant up to the
“FULL” line.
Power control unit coolant reservoirReservoir cap
Full
Low
If the level is on or below the “L”
line, add coolant up to the “F” line.
ITO43P111
■If the coolant level drops within a short time after replenishing
Visually check the radiator, hoses, reservoir cap, radiator cap, drain cock
and water pump. 
If you cannot find a leak, have your Toyota dealer pressure test the cap and
check for leaks in the cooling system.

5
When trouble arises
549
5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.
Check to see if the cooling fans are operating.
If the fans are operating: 
Wait until the high coolant temperature warning light goes
off and then stop the hybrid system.
If the fans are not operating:  Stop the hybrid system immedi ately and call your local
Toyota dealer.
After the hybrid system has
cooled down sufficiently, check
the engine coolant level and
inspect the radiator core (radia-
tor) for any leaks.
If necessary, add engine coolant
up to the “FULL” line.
Water can be used in an emer-
gency measure if engine coolant
is unavailable. (P. 562)
STEP3
STEP4
ITO52P130
STEP5

550 5-2. Steps to take in an emergency
PRIUS_U (OM47668U) U.S.A.■
If “HYBRID SYSTEM OVERHEAT” is shown on the multi-infor-
mation display
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Leave the hybrid system operating and carefully lift the hood.
Check if the cooling fans are operating.
If the fans are operating: 
Wait until “HYBRID SYSTEM OVERHEAT” disappears and
then stop the hybrid system. 
If the message does not disapp ear, call your Toyota dealer.
If the fans are not operating: 
Stop the hybrid system immediately and call your Toyota
dealer.
After the hybrid system has
cooled down, check the power
control unit coolant level and
inspect the cooling system for
leaks.
STEP1
STEP2
STEP3
STEP4

608 Alphabetical index
PRIUS_U (OM47668U) U.S.A.
Vanity lightsVanity lights ...........................377
Wattage .................................567
Vanity mirrors...........................377
Vehicle identification 
number ...................................557
Vehicle load limits.................... 260
Warning buzzers Brake system ........................496
Open door ............................ 499
Seat belt reminder .................499
Warning lights Anti-lock brake 
system (ABS) ......................497
Automatic headlight  leveling system .... ...............497
Brake system ........................496
Charging system .... ...............497
Electric power steering .........497
High coolant temperature ......499
Low fuel level ........................499
Malfunction indicator lamp ....497
Master warning......................499
Open door ............................. 499
Pre-Collision system ............. 497
Seat belt reminder .................499
SRS airbags .......................... 497
Tire pressure .........................499
Warning messages .................. 508
Washer Checking ............................... 434
Preparing and checking 
before winter ....................... 261
Switch.................................... 210
Washing and waxing ............... 404 Weight
Cargo capacity ...................... 260
Load limits ............................. 260
Weight ................................... 556
Wheels ...................................... 455
Window glasses ........................ 98
Window lock switch................... 98
Windows Power windows ....................... 98
Rear window defogger .......... 289
Washer.................................. 210
Windshield wipers ................... 210
Winter driving tips ................... 261
Wireless remote control key Locking/Unlocking ................... 63
Replacing the battery ............ 460
WMA disc.................................. 311V
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