2001 TOYOTA PRIUS radiator

BODY ELECTRICAL ± AIR CONDITIONING
Ventilation and
Heater Air Conditioning
153

Performance 
ItemPerformance
Heat Output W5300
HeaterAir Flow Volume m3/h330
Power Consumption W170
Heater Core Inte-
grated PTC HeaterHeat Output W330 (165 x 2)
PIC Heater*1Heat Output W165 x 2
Heat Output W4200*2
Air ConditioningAir Flow Volume m3/h450g
Power Consumption W200
*1: U.S.A. Cold Area Specification Model and Canada Model
*
2: When the compressor is at 1,800 rpm

Specifications 
ItemSpecifications
TypeStraight Flow
(Full-path Flow)
Heater CoreSize
W x H x L mm (in.)216.9 x 140 x 27
(8.5 x 5.5 x 1.1)
Fin Pitch mm (in.)1.8 (0.07)
Motor TypeS70F-13T
BlowerFan SizeExternal Air132 x 41
(5.2 x 1.6)
Fan Size
Dia. x H mm (in.)Internal Air150 x 36
(5.9 x 1.4)
TypeMulti-Flow Type
(Sub-Cool Type)
CondenserSize
W x H x L mm (in.)600 x 349.8 x 37.5*
(23.6 x 13.8 x 1.5)
Fin Pitch mm (in.)2.8 (0.11)
TypeDrawn Cup
(Multi-tank, Super Slim Structure)
EvaporatorSize
W x H x L mm (in.)253.2 x 215 x 58
(10.0 x 8.5 x 2.3)
Fin Pitch mm (in.)3.5 (0.14)
CompressorTypeSCS06
*: With the radiator

BODY ELECTRICAL ± AIR CONDITIONING
163BE17
Inner FinAntibacterial Agent
Nylon Layer
Chromate Layer
Aluminum
Matrix
182BE48
ModulatorMulti-Flow Condenser
Condensing Portion
Gaseous Refrigerant
Liquid Refrigerant
Super-Cooling Portion 158
Evaporator
By placing the tanks at the top and the bottom of the evaporator unit and by adopting an inner fin construc-
tion, the heat exchanging efficiency has been improved and the evaporator unit's temperature distribution
has been made more uniform. As a result, it has become possible to realize a thinner evaporator construction.
Furthermore, the evaporator body has been coated with a type of resin that contains an antibacterial agent
in order to minimize the source of foul odor and the propagation of bacteria.
2. Condenser
The Prius has adopted sub-cool condenser in which a multi-flow condenser (consisting of two cooling por-
tions: a condensing portion and a super-cooling portion) and a gas-liquid separator (modulator) have been
integrated. This condenser has adopted the sub-cool cycle for its cooling cycle system to improve the heat
exchanging efficiency.
This condenser is integrated with the radiator to minimize the space they occupy in the engine compartment.
For details, see page 54 in the Engine Cooling System Section.
Sub-Cool Cycle
In the sub-cool cycle of the sub-cool condenser that has been adopted, after the refrigerant passes through
the condensing portion of the condenser, both the liquid refrigerant and the gaseous refrigerant that could
not be liquefied are cooled again in the super-cooling portion. Thus, the refrigerant is sent to the evaporator
in an almost completely liquefied state.

B02389
B02390
HEAT METHOD: When the problem seems to occur when the suspect area is heated. 2
NOTICE:3 WATER SPRINKLING METHOD:
(1)
(2)
4 OTHER: When a malfunction seems to occur when electrical load is excessive.When the malfunction seems to occur on a rainy day or in a
high±humidity condition. Heat the component that is the likely cause of the malfunction
with a hair dryer or similar object. Check to see if the malfunction
occurs.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
Turn on all electrical loads including the heater blower, head
lights, rear window defogger, etc. and check to see if the mal-
function occurs.ON HINT:
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be taken.
Malfunc-
tion
Do not heat to more than 60 °C (140 °F). (Temperature
is limited not to damage the components.)
Do not apply heat directly to parts in the ECU. (1)
(2)
Never sprinkle water directly into the engine compart-
ment, but indirectly change the temperature and hu-
midity by applying water spray onto the radiator front
surface.
Never apply water directly onto the electronic compo-
nents. NOTICE: IN±36
± INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
2001 PRIUS (RM778U)

MA02G±02
MA±4
± MAINTENANCEUNDER HOOD
57 Author: Date:
2001 PRIUS (RM778U)
UNDER HOOD
GENERAL MAINTENANCE
1. GENERAL NOTES

Maintenance items may vary from country to country. Check the owner's manual supplement in which
the maintenance schedule is shown.

Every serice item in the periodic maintenance schedule must be performed.

Periodic maintenance service must be performed according to whichever interval in the periodic main-
tenance schedule occurs first, the odometer reading (miles) or the time interval (months).

Maintenance service after the last period should be performed at the same interval as before unless
otherwise noted.
2. WINDSHIELD WASHER FLUID
Check that there is sufficient fluid in the tank.
3. ENGINE COOLANT LEVEL
Check that the coolant level is between the ºFULLº and ºLOWº lines on the see±through reservoir.
4. RADIATOR AND HOSES
(a) Check that the front of the radiator is clean and not blocked with leaves, dirt or bugs.
(b) Check the hoses for cracks, kinks, rot or loose connections.
5. BRAKE FLUID LEVELS
Check that the brake fluid levels are near the upper level line on the see±through reservoirs.
6. CHECK TRANSAXLE OIL (FLUID)

Visually check the transaxle for oil (fluid) leakage.

If leakage is found, check for the cause and repair.
HINT:
Wait until the engine and motor cools down (approx. 30 min.) before checking the fluid level after extended
driving at high speeds, in hot weather, in heavy traffic or pulling a trailer.

PP2FH±02
± PREPARATIONCOOLING
PP±13
2001 PRIUS (RM778U)
EQUIPMENT
Belt tension gauge
HeaterThermostat
Radiator cap tester
ThermometerThermostat
Torque wrench
Vernier calipers

PP3AE±01
± PREPARATIONAIR CONDITIONING
PP±59
2001 PRIUS (RM778U)
RECOMMENDED TOOLS
09040±00011Hexagon Wrench Set .
(09043±20050)Socket Hexagon Wrench 5.Expansion valve
5.0 mm (0.20 in.)
(09043±20100)Socket Hexagon Wrench 10.Radiator & condenser module
10 mm (0.39 in.)
09082±00040TOYOTA Electrical Tester.
09216±00021Belt Tension Gauge .
09905±00013Snap Ring Pliers .

SS176±03
SS±14
± SERVICE SPECIFICATIONSCOOLING
136 Author: Date:
2001 PRIUS (RM778U)
COOLING
SERVICE DATA
Drive beltTension (Reference) New belt
Used belt110 ± 11 lbf
67 ± 10 lbf
ThermostatValve opening temperature
at 90°C (199°F)80.0 ± 84.0°C (176 ± 183°F)
8.5 mm (0.345 in.) or more
Radiator capRelief valve opening pressure STD
Minimum74 ± 103 kPa (0.75 ± 1.05 kgf/cm2, 10.7 ± 14.9 psi)
79 kPa (0.8kgf/cm2, 11.5 psi)
Electric
cooling fanAmperage STD9.2 ± 11.0 A

SS177±02
± SERVICE SPECIFICATIONSCOOLING
SS±15
2001 PRIUS (RM778U)
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Drain plug12.71309
Water pump x Timing chain cover1111 08
Pump pulley x Water pump1515011
Water inlet x Cylinder block9.09080 in.´lbf
Electric cooling fan assembly x Radiator7.57666 in.´lbf
Fan motor x Fan shroud2.652723 in.´lbf
Fan x Fan motor6.46657 in.´lbf