TECHNICAL FEATURES
GENERAL00-12
ATF WARMER (ATF COOLER) <4A9>
AC403052AC
AT F
Engine coolant
Sectional view
ATF Warmer
(ATF Cooler)
Thermo valve
AC403006
CVT CVT CVT
Thermostat
Thermo
valve
ATF warmer (ATF cooler)ATF warmer (ATF cooler)
: Engine coolant
: ATF
85˚C or more>
Engine coolant flows through
all the sections.
75
- 85˚C>
Engine coolant flows through
the heater and the ATF warmer.
75˚C or less>
Engine coolant flows through
the heater only.
AD
: Valve open
: Valve closed
Thermostat
Thermo
valve
ATF warmer (ATF cooler)Thermo
valve
Thermostat
Radiator
Engine Heater
Radiator Engine Heater
Radiator
Engine Heater
The A TF warme r (A TF cooler) is adop ted for the
mode ls with 4A9 en gine. (the A TF cooler incorporat
-
ing the radiator is no t adopted)
At the start of runn ing, the tempe rature of th e engine
coolant rises earlier tha n that of the AT F. The A TF
war mer ut ilizes this ch aracteristic to raise the ATF
tempe rature a s ea rly a s po ssible to an a ppropriate
leve l (70
−80 °C). It also co ntrols flu id tempera ture st
ably and reduces A TF agitation resist ance to
imp rove f uel consump tion ra tio.
In addition , a thermo-valve has bee n adopted to
restrict the eng ine coolant supply to the A TF warmer
(A TF coole r) until the engine co olant temperature
reach es th e appro priat e temperature when low tem
-
perature start in winter , giving the priority to th e heat-
ing performance .
GENERAL INFORMATION
ENGINE COOLING14-2
GENERAL INFORMATION
M2140000100638
The cooling system is a water-cooled pressurized,
forced circulation type which offers the following fea
-
tures:
•To stabilize engine coolant temperature, the ther-
mostat is located at the coolant inlet port from the
radiator.
•To improve engine cooling performance and save
weight, a plastic radiator tank and aluminium radi
-
ator fins are used.
•In order to save the weight, the A/C condenser
fan has been abolished, and one-fan system has
been adopted to secure sufficient cooling effect
using the radiator fan only.
•A radiator condenser tank integrated with a radia-
tor has been adopted in order to save the weight.
•A cross flow type radiator assembly whose tanks
are installed on the both sides of the radiator fins
has been adopted in order to decrease the over
-
all height of the radiator and improve the aerody-
namic performance.
•Sufficient radiator fin area and cooling fan diame-
ter are secured, and the radiator fin pitch is
increased. As a result, the capacity of the cooling
fan motor is reduced cutting down the power con
-
sumption, and the noise and weight of the cooling
fan are reduced.
SPECIFICATIONS
Item4A9-M/T4A9-CVT4G1
Cooling methodWater-cooled pressurized, forced circulation with electrical
fan
Water pumpTy p eCentrifugal impeller
Drive methodDrive belt
ThermostatTy p eWax pellet with jiggle valve
Valve open temperature
°C
82 ± 282 ± 1.5
RadiatorTy p ePressurized corrugate type
Core size (width × height
× thickness) mm
369.8 × 624.2 × 16
Performance kJ/h155,200175,300
Engine coolantSpecified coolantDIA QUEEN SUPER LONG LIFE COOLANT or equivalent
Quantity (including radiator
condenser tank) L5.35.46.8
CVT
CONTINUOUSLY VARIABLE TRANSMISSION (CVT)23-5
ATF WARMER (ATF COOLER)
M2230000600082
AC403052AC
AT F
Engine coolant
Sectional view
ATF Warmer
(ATF Cooler)
Thermo valve
AC403006
CVT CVT CVT
Thermostat
Thermo
valve
ATF warmer (ATF cooler)ATF warmer (ATF cooler)
: Engine coolant
: AT F
85˚C or more>
Engine coolant flows through
all the sections.
75 - 85˚C>
Engine coolant flows through
the heater and the ATF warmer.
75˚C or less>
Engine coolant flows through
the heater only.
AC
: Valve open
: Valve closed
Thermostat
Thermo
valve
ATF warmer (ATF cooler)Thermo
valve
Thermostat
Radiator
Engine Heater
Radiator Engine Heater
Radiator
Engine Heater
The A TF warme r (A TF cooler) is adop ted. (th e A TF
cooler in
corpo r ating the rad i ator is n o t ado pted)
At the st art of runn ing, th e tempe r ature of th e engine
coolant rises earlier tha
n that of the A T F . The A TF
war
m er ut ilizes this ch aract e ristic to raise the A TF
tempe
r ature a s ea rly a s po ssible to an a ppropriate
leve
l (70 - 80
°C). It also contro ls fluid temperature st ably and reduces A TF agit a tion resist ance to
imp r ove f uel consump t ion ra tio.
In addition
, a the r mo-valve has bee n adop ted to
restrict the eng
ine coolan t supply to the A TF warmer
(A
TF coole r) until the engine co olan t temperature
reach
e s th e appro p riat e temperature when low tem
-
perature st art in winter , giving the priority to th e heat-
ing pe rformance .
