Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 92
EX(STI)-16
Muffler
EXHAUST
COOLING
CO(STI)
Page
General Description . . . . . . . . . . . . . . . . . . . . ...2
Radiator Fan System . . . . . . . . . . . . . . . . . . . . .7
Engine Coolant . . . . . . . . . . . . . . . . . . . . . . .13
Water Pump . . . . . . . . . . . . . . . . . . . . . . . .15
Thermostat . . . . . . . . . . . . . . . . . . . . . . . ...17
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . 19
Radiator Cap . . . . . . . . . . . . . . . . . . . . . . . 22
Radiator Main Fan and Fan Motor . . . . . . . . . . . . . . ...23
Radiator Sub Fan and Fan Motor . . . . . . . . . . . . . . . .25
Reservoir Tank . . . . . . . . . . . . . . . . . . . . . . .27
Coolant Filler Tank . . . . . . . . . . . . . . . . . . . . ...28
Engine Cooling System Trouble in General . . . . . . . . . . . .29
CO(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. 7.7 (8.1, 6.8)
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
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)
Positive pres-
sure 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 pres-
sure 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(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
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