2012 TOYOTA PRIUS C cooling

370 4-3. Do-it-yourself maintenance
■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. (Minimum temperature: -31 F [-35 C])
Canada: “Toyota Super Long Life Coolant” is a mixture of 55% coolant 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 radiators, 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 systems.
CAUTION
■When the hybrid system is hot
Do not remove the engine coolant radiator cap and power control unit cool-
ant reservoir cap.
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 stra ight antifreeze. The correct 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 parts or paint.

406 4-3. Do-it-yourself maintenance
25 ECU-B NO.2 7.5 AAir conditioning system, gauge
and meters, occupant classifica-
tion system, tire pressure warning
system, starter system, smart key
system, power door lock system
26 AM2 7.5 A Starter system
27 STRG LOCK 20 A Starter system
28 ABS NO.2 10 A Brake system
29 IGCT-MAIN 30 A IGCT NO.2, IGCT NO.3, IGCT
NO.4, PCU, BATT FAN
30 D/C CUT 30 A DOME, ECU-B NO.1
31 PTC HTR NO.1 30 A PTC heater
32 PTC HTR NO.2 30 A PTC heater
33 FAN 30 A Electric cooling fan
34 PTC HTR NO.3 30 A PTC heater
35 DEF 30 A MIR HTR, rear window defogger
36 DEICER 20 A No circuit
37 BATT FAN 10 A Battery cooling fan
38 IGCT NO.2 10 A Hybrid system
39 IGCT NO.4 10 A Hybrid system
40 PCU 10 A Hybrid system
41 IGCT NO.3 10 A Hybrid system
42 MIR HTR 10 A Outside rear view mirror defoggers
FuseAmpereCircuit

480
5-2. Steps to take in an emergency
If your vehicle overheats
Correction procedures■ If is shown on the mu lti-information display:
Stop the vehicle in a safe place and turn off the air condition-
ing system.
Check to see if steam is coming out from the engine area.
If you see steam:
Stop the hybrid system. Carefully lift the hood after the steam
subsides and then restart the hybrid system.
If you do not see steam:
Leave the hybrid system operating and carefully lift the hood.
Check to see if the cooling fans are operating.
If the fans are operating:
Wait until disappears and then stop the hybrid system.
If the fans are not operating:
Stop the hybrid system immediately and call your Toyota
dealer.
The following may indicate that your vehicle is overheating:
● is shown on the multi-information display:
The engine may be overheating.
● The hybrid system overheat wa rning message is shown on the
multi-informat ion display:
The power control unit may be overheating.
Follow the correction procedure as described below.
STEP1
STEP2
STEP3

5
When trouble arises
481
5-2. Steps to take in an emergency
After the hybrid system has
cooled down sufficiently, check
the engine coolant level and
inspect the cooling system for
leaks.
Add engine coolant if necessary.
Water can be used in an emer-
gency if engine coolant is unavail-
able. (
P. 494)
Have the vehicle inspected at the nearest Toyota dealer as soon as
possible.
STEP4
STEP5

482 5-2. Steps to take in an emergency
■If the hybrid system overheat warning message is shown on
the multi-information 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 the hybrid overh eat warning message 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.
Add power control unit coolant if
necessary.
Water can be used in an emer-
gency if power control unit cool-
ant is unavailable. (P. 494)
Have the vehicle inspected at the nearest Toyota dealer as soon as
possible.
STEP1
STEP2
STEP3
STEP4
STEP5

5
When trouble arises
483
5-2. Steps to take in an emergency
■
Overheating
The following symptoms may occur when your vehicle is overheating:
●Hybrid system output decreases.
● Steam comes out from the engine area.
CAUTION
■To prevent an accident or injury when inspecting under the hood of
your vehicle
●If steam is seen coming from under the hood, do not open the hood until
the steam has subsided. The engine compartment may be very hot, caus-
ing serious injuries such as burns.
● Check that on the multi-information display and the “READY” indi-
cator are off.
● For vehicles with a hybrid system, there are times when the gasoline
engine automatically starts to run or the cooling fans suddenly start to
operate. Do not touch or approach the rotating parts of the belt or fans.
Doing so may lead to fingers, clothes or tools getting caught, resulting\
in
injury.
● Do not loosen the radiator cap while the hybrid system and radiator are
hot.
Serious injuries, such as burns, may result from hot coolant and steam
released under pressure.

484 5-2. Steps to take in an emergency
NOTICE
■When adding engine/power control unit coolant
Wait until the hybrid system has cooled down before adding engine/power
control unit coolant.
When adding coolant, do so slowly. Adding cool coolant to a hot hybrid sys-
tem too quickly can cause damage to the hybrid system.
■ To prevent damage to the cooling system
Observe the following precautions:
●Avoid contaminating the coolant with foreign matter (such as sand or dust
etc.).
● When using coolant additives, use genuine Toyota products or equivalent.

494 6-1. Specifications
Oil viscosity (0W-20 is explained here as an example):
• The 0W in 0W-20 indicates the characteristic of the oil which allowscold startability. Oils with a lower value before the W allow for easier
starting of the engine in cold weather.
• The 20 in 0W-20 indicates the viscosity characteristic of the oil when the oil is at high temperature. An oil with a higher viscosity (one with a
higher value) may be better suited if the vehicle is operated at high
speeds, or under extreme load conditions.
How to read oil container label:
The ILSAC (International Lubricant Standardization and Approval
Committee) Certification Mark is added to some oil containers to help
you select the oil you should use.
Cooling system
Capacity Gasoline engine
Power control unit 5.6 qt. (5.3 L, 4.7 Imp. qt.)
1.7 qt. (1.6 L, 1.4 Imp. qt.)
Coolant type Use either of the following:
• “Toyota Super Long Life Coolant”
• A similar high-quality ethylene glycol-based non-silicate, non-amine, non-nitrite,
and non-borate coolant with long-life
hybrid organic acid technology
Do not use plain water alone.