Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 183
COOLING
CO(w/o STI)
Page
1.
General Description . . . . . . . . . . . . . . . . . . . . ...2
2.
Radiator Fan System . . . . . . . . . . . . . . . . . . . . .7
3.
Engine Coolant . . . . . . . . . . . . . . . . . . . . . . .13
4.
Water Pump . . . . . . . . . . . . . . . . . . . . . . . .15
5.
Thermostat . . . . . . . . . . . . . . . . . . . . . . . ...17
6.
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.
Radiator Cap . . . . . . . . . . . . . . . . . . . . . . . 22
8.
Radiator Main Fan and Fan Motor . . . . . . . . . . . . . . ...23
9.
Radiator Sub Fan and Fan Motor . . . . . . . . . . . . . . . .25
10.
Reservoir Tank . . . . . . . . . . . . . . . . . . . . . . .27
11.
Coolant Filler Tank . . . . . . . . . . . . . . . . . . . . ...28
12.
Engine Cooling System Trouble in General . . . . . . . . . . . .29
CO(w/o STI)-2
General Description
COOLING
1. General Description
A: SPECIFICATION
Cooling system
Electric fan + Forced engine coolant
circulation system
Total engine coolant capacity
L (US qt, Imp qt)
Approx. 7.4 (7.8, 6.5)
Water
pump
Type
Centrifugal impeller type
Discharge
performance
Discharge
rate
L (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 pump case
mm (in) Standard
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
318.5 mm (12.54 in)/9
Sub fan
318.5 mm (12.54 in)/11
Radiator
Type
Down flow
Core dimen-
sions
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)
Positive pressure
side
Standard
93 — 123 (0.95 — 1.25, 14 — 18)
Limit
83 (0.85, 12)
Negative
pressure side
Standard
–1.0 — –4.9
(–0.01 — –0.05, –0.1 — –0.7)
Radiator
side
kPa (kg/cm
2
, psi)
Positive pressure
side only
Standard 122 — 152 (1.24 — 1.55, 18 — 22)
Limit
112 (1.14, 16)
Fins
Corrugated fin type
Reservoir
tank
Capacity
L (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)
K0670Y0001
Water for dilution
Distilled water
—
Soft water or tap water
Cooling system protective agent
Cooling system conditioner
SOA345001
—
CO(w/o STI)-3
General Description
COOLING
B: COMPONENT
1. WATER PUMP
(1)
Water pump ASSY
(6)
Thermostat cover
Tightening torque: N·m (kgf-m, ft-lb)
(2)
Gasket
(7)
Coolant filler by-pass hose
T1: First 12 (1.2, 8.9)
(3)
Heater by-pass hose
(8)
Clip
Second 12 (1.2, 8.9)
(4)
Thermostat
(9)
Water pump sealing
T2: 12 (1.2, 8.9)
(5)
Gasket
CO-02779
(6)
(4)
(1)
(5)
(2)
T2
(3)
(7)
(8)
(8)
(9)
T1
CO(w/o STI)-4
General Description
COOLING
2. RADIATOR & RADIATOR FAN
(1)
Radiator lower cushion
(12) Radiator main fan shroud
(23) Over flow hose B
(2)
Radiator
(13) Radiator sub fan
(24) Main fan motor
(3)
Radiator upper cushion
(14) Radiator main fan
(25) Sub fan motor
(4)
Radiator upper bracket
(15) Radiator outlet hose
(26) Clip
(5)
Clip
(16) Radiator drain plug
(6)
Radiator inlet hose
(17) O-ring
Tightening torque: N·m (kgf-m, ft-lb)
(7)
Engine coolant reservoir tank cap
(18) Coolant filler tank
T1: 3.4 (0.3, 2.5)
(8)
Over flow hose A
(19) Radiator cap (coolant filler tank
cap)
T2: 4.41 (0.45, 3.25)
(9)
Engine coolant reservoir tank
(20) Engine coolant hose A
T3: 7.5 (0.8, 5.5)
(10) Over flow pipe
(21) Engine coolant hose B
T4: 12 (1.2, 8.9)
(11) Radiator sub fan shroud
(22) Radiator lower bracket
(21)
(20)
(26)
(26)
(19)
(18)
CO-03314
(14)
T1
T3
T3
(9)
(7)
(10)
(8)
(23)
(25)
(24)
(12)
(11)
T2
T2
(5)
(6)
(5)
T3
(1)
(22)
(15)
(5)
(5)
(13)
T1
(2)
(16)
(17)
(3)
(4)
T4
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