Subaru Legacy IV (2008 year). Service manual — part 285
CO(H4DOTC)-2
General Description
COOLING
1. General Description
A: SPECIFICATION
Cooling system
Electric fan + Forced engine coolant
circulation system
Total engine coolant capacity
2 (US qt, Imp qt)
AT: approx. 7.2 (7.6, 6.3)
MT: approx. 7.3 (7.7, 6.4)
Water
pump
Type
Centrifugal impeller type
Discharge
performance I
Discharge rate
2 (US gal, Imp gal) /min.
20 (5.3, 4.4)
Pump speed — Discharge pressure
760 rpm — 2.9 kPa (0.3 mAq)
Engine coolant temperature
80°C (176°F)
Discharge
performance II
Discharge rate
2 (US gal, Imp gal) /min.
100 (26.4, 22.0)
Pump speed — Discharge pressure
3,000 rpm — 49.0 kPa (5.0 mAq)
Engine coolant temperature
80°C (176°F)
Discharge
performance III
Discharge rate
2 (US gal, Imp gal) /min.
200 (52.8, 44.0)
Pump speed — Discharge pressure
6,000 rpm — 225.4 kPa (23.0 mAq)
Engine coolant temperature
80°C (176°F)
Impeller diameter
mm (in)
76 (2.99)
Number of impeller vanes
8
Pump pulley diameter
mm (in)
60 (2.36)
Clearance
between impeller
and case
Standard
mm (in)
0.5 — 1.5 (0.020 — 0.059)
Thermostat
Type
Wax pellet type
Starting temperature to open
76 — 80°C (169 — 176°F)
Fully opens
91°C (196°F)
Valve lift
mm (in)
9.0 (0.354) or more
Valve bore
mm (in)
35 (1.38)
Radiator
fan
Motor input
Main fan
W
120
Sub fan
W
120
Fan diameter /
Blade
Main fan
320 mm (12.6 in)/5
Sub fan
320 mm (12.6 in)/7
Radiator
Type
Down flow
Core dimensions
Width × Height × Thickness
mm (in)
687.4 × 340 × 16
(27.06 × 13.39 × 0.63)
Pressure range in
which cap valve is
open
Coolant filler tank side
kPa (kg/cm
2
, psi)
Above: 108
r14.7
(1.1
r0.15, 16r2.1)
Below: –1.0 to –4.9
(–0.01 — –0.05, –0.1 — –0.7)
Radiator side
kPa (kg/cm
2
, psi)
Above only: 137
r14.7
(1.40
r0.15, 20r2.1)
Fins
Corrugated fin type
Reservoir
tank
Capacity
2 (US qt, Imp qt)
0.45 (0.48, 0.40)
Recommended materials
Item number
Alternative
Coolant
SUBARU SUPER COOLANT
(Concentrated type)
—
—
SUBARU SUPER COOLANT
(Diluted type)
K0670Y0000
Water for dilution
Distilled water
—
Soft water or tap water
Cooling system protective
agent
Cooling system conditioner
SOA345001
—
CO(H4DOTC)-3
General Description
COOLING
B: COMPONENT
1. WATER PUMP
(1)
Water pump ASSY
(5)
Gasket
Tightening torque:N·m (kgf-m, ft-lb)
(2)
Gasket
(6)
Thermostat cover
T1: First 12 (1.2, 8.9)
(3)
Heater by-pass hose
(7)
Coolant filler by-pass hose
Second 12 (1.2, 8.9)
(4)
Thermostat
(8)
Clip
T2: 12 (1.2, 8.9)
CO-02417
(6)
(4)
(1)
(5)
(2)
T2
T1
T1
(3)
(7)
(8)
(8)
CO(H4DOTC)-4
General Description
COOLING
2. RADIATOR AND RADIATOR FAN
CO-02499
T2
T3
T2
(27)
(26)
(5)
(5)
(25)
(12)
(11)
(14)
(5)
(1)
(2)
(28)
(5)
(21)
(13)
(24)
(3)
T5
(4)
(5)
(6)
(5)
T3
T4
(9)
(7)
(10)
(8)
(29)
T4
(15)
(15)
(18)
(19)
(20)
B
C
T4
T4
(17)
(16)
(15)
(15)
T4
C
B
(30)
T1
(22)
(23)
CO(H4DOTC)-5
General Description
COOLING
C: CAUTION
• Wear appropriate work clothing, including a cap,
protective goggles and protective shoes when per-
forming any work.
• Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust and dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly and replacement.
• Vehicle components are extremely hot after driv-
ing. Be wary of receiving burns from heated parts.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or rigid racks at the specified
points.
• Before disconnecting connectors of sensors or
units, be sure to disconnect the ground cable from
battery.
• Prepare a container and cloth to prevent scatter-
ing of engine coolant when performing work where
engine coolant can be spilled. If the fuel spills, wipe
it off immediately to prevent from penetrating into
floor or flowing out for environmental protection.
• Follow all government and local regulations con-
cerning disposal of refuse when disposing engine
coolant.
(1)
Radiator lower cushion
(14)
Radiator main fan ASSY
(26)
Coolant filler tank hose A
(2)
Radiator
(15)
ATF hose clip (AT model)
(27)
Coolant filler tank hose B
(3)
Radiator upper cushion
(16)
ATF hose A (AT model)
(28)
Radiator lower bracket
(4)
Radiator upper bracket
(17)
ATF hose B (AT model)
(29)
Over flow hose B
(5)
Clip
(18)
ATF pipe (AT model)
(30)
Heat shield cover (AT model)
(6)
Radiator inlet hose
(19)
ATF hose C (AT model)
(7)
Engine coolant reservoir tank cap
(20)
ATF hose D (AT model)
Tightening torque:N·m (kgf-m, ft-lb)
(8)
Over flow hose A
(21)
Radiator outlet hose
T1: 3 (0.3, 2.2)
(9)
Engine coolant reservoir tank
(22)
Radiator drain plug
T2: 3.4 (0.3, 2.5)
(10)
Over flow pipe
(23)
O-ring
T3: 5 (0.5, 3.7)
(11)
Radiator sub fan shroud
(24)
Engine coolant filler tank
T4: 7.5 (0.8, 5.5)
(12)
Radiator main fan shroud
(25)
Radiator cap
(Engine coolant filler tank cap)
T5: 12 (1.2, 8.9)
(13)
Radiator sub fan ASSY
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