2010 TOYOTA PRIUS radiator

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.

417
4-3. Do-it-yourself maintenance
4
Maintenance and care
PRIUS_U (OM47668U) U.S.A.
ItemsParts and tools
Brake fluid level (
P. 432)
• FMVSS No.116 DOT 3 or SAE
J1703 brake fluid
• Rag or paper towel
• Funnel (used only for adding brake fluid)
Engine oil level ( P. 426)
• “Toyota Genuine Motor Oil” or
equivalent
• Rag or paper towel
• Funnel (used only for adding engine oil)
Fuses (P. 462)• Fuse with same amperage rating
as original
Radiator and condenser (P. 432)
Tire inflation pressure ( P. 451)• Tire pressure gauge
• Compressed air source
Washer fluid (P. 434)
• Water or washer fluid containing
antifreeze (for winter use)
• Funnel (used only for adding washer fluid)

418 4-3. Do-it-yourself maintenance
PRIUS_U (OM47668U) U.S.A.
CAUTION
The engine compartment contains many mechanisms and fluids that may
move suddenly, become hot, or become electrically energized. To avoid death
or serious injury observe the following precautions.
■When working on the engine compartment
● Keep hands, clothing, and tools away from the moving fan.
● Be careful not to touch the engine, power control unit, radiator, exhaust
manifold, etc. right after driving as they may be hot. Oil and other fluids
may also be hot.
● Do not leave anything that may burn easily, such as paper or rags, in the
engine compartment.
● Do not smoke, cause sparks or expose an open flame to fuel. Fuel fumes
are flammable.
● Never touch, disassemble, remove or replace the high voltage parts,
cables and their connectors. It can cause severe burns or electric shock
that may result in death or serious injury.
● When the hybrid system is operating with the “READY” indicator on, the
engine may suddenly start in some cases. When you inspect the engine
compartment, be sure to turn off the hybrid system.
■ When working near the electric cooling fan or radiator grille
Be sure the “POWER” switch is OFF. 
With the “POWER” switch in ON mode, the electric cooling fan may automat-
ically start to run if the air conditioning is on and/or the coolant temperature
is high. ( P. 432)
■ Safety glasses
Wear safety glasses to prevent flying or falling material, fluid spray, etc. from
getting in the eyes.

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.

432 4-3. Do-it-yourself maintenance
PRIUS_U (OM47668U) U.S.A.
Radiator and condenserCheck the radiator and condenser and clear any foreign objects. 
If either of the above parts are extr emely dirty or you are not sure of
their condition, have your vehicl e checked by your Toyota dealer.
Brake fluid
■ Checking fluid level
The brake fluid level should be
between the “MAX” and “MIN”
lines on the tank.
CAUTION
■When the hybrid system is hot
Do not touch the radiator or condenser, as they may be hot and may cause
burns.
ITO43P151

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

606 Alphabetical index
PRIUS_U (OM47668U) U.S.A.
Parking brake ...........................179
Parking lightsReplacing light bulbs ............. 472
Switch.................................... 206
Wattage .................................567
PCS............................................ 249
Personal lights .........................363
Power outlet ............................. 379
Power windows ..........................98
Pre-Collision System ............... 249
Radiator .................................... 432
Radio ......................................... 294
Rear turn signal lights
Replacing light bulbs ............. 472
Wattage .................................567
Rear view monitor system ......231
Rear window defogger ............289
Rear window wiper 
and washer ............................. 212
Remote Air C onditioning 
System .................................... 285
Replacing Electronic key battery ............460
Fuses .................................... 462
Light bulbs ............................. 472
Tires ......................................524
Reporting safety defects for  U.S. owners ............................ 596 Safety Connect......................... 395
Seat belts
Adjusting the seat belt............. 85
Automatic Locking Retractor 
(ALR) .................................... 87
Child restraint system 
installation........................... 137
Cleaning and maintaining 
the seat belts ...................... 408
Emergency Locking Retractor 
(ELR) .................................... 87
How to wear your seat belt ..... 85
How your child should wear 
the seat belt .......................... 88
Pregnant women, 
proper seat belt use .............. 87
Reminder light ....................... 499
Seat belt extenders ................. 88
Seat belt pretensioners ........... 86
Seat heaters ............................. 381
Seating capacity ...................... 260
Seats Adjustment .............................. 78
Adjustment precautions .......... 79
Child seats/child restraint system installation .............. 137
Cleaning ................................ 407
Head restraint ......................... 82
Properly sitting in the seat..... 111
Seat heaters.......................... 381
Service reminder 
indicators .............................. 185
Shift lever Transmission......................... 171
Side airbags ............................. 113
Side marker lights Replacing light bulbs ............. 472
Switch ................................... 206
Wattage................................. 567
Side mirror
Adjusting and folding............... 96P
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