Subaru Impreza 2003, Service Manual

Page: 1110 / 3610

CO(H4DOTC)-2
COOLING
GENERAL DESCRIPTION
1. General Description
A: SPECIFICATIONS
Model DOHC TURBO
Cooling system Electric fan + Forced engine coolant circulation system
Total engine coolant capacity
2
(US qt, Imp qt)
AT: Approx. 7.6 (8.03, 6.69)
MT: Approx. 7.7 (8.14, 6.78)
Water pump
Type Centrifugal impeller type
Discharge perfor-
mance I
Discharge 20
2
(5.3 US gal, 4.4 Imp gal)/min.
Pump speed—Discharge
pressure
760 rpm — 2.9 kPa (0.3 mAq)
Engine coolant temperature 85
°
C (185
°
F)
Discharge perfor-
mance II
Discharge 100
2
(26.4 US gal, 22.0 Imp gal)/min.
Pump speed—Discharge
pressure
3,000 rpm — 49.0 kPa (5.0 mAq)
Engine coolant temperature 85
°
C (185
°
F)
Discharge perfor-
mance III
Discharge 200
2
(52.8 US gal, 44.0 Imp gal)/min.
Pump speed—Discharge
pressure
6,000 rpm — 225.4 kPa (23.0 mAq)
Engine coolant temperature 85
°
C (185
°
F)
Impeller diameter 76 mm (2.99 in)
Number of impeller vanes 8
Pump pulley diameter 60 mm (2.36 in)
Clearance between
impeller and case
Standard 0.5 — 0.7 mm (0.020 — 0.028 in)
Limit 1.0 mm (0.039 in)
“Thrust” runout of impeller end 0.5 mm (0.020 in)
Thermostat
Type Wax pellet type
Starts to open 76 — 80
°
C (169 — 176
°
F)
Fully opened 91
°
C (196
°
F)
Valve lift 9.0 mm (0.354 in) or more/91
°
C (196
°
F)
Valve bore 35 mm (1.38 in)
Radiator fan
Motor
Main fan 120 W
Sub fan 120 W
Fan diameter
×
Blade
320 mm (11.81 in)
×
5 (main fan)
320 mm (11.81 in)
×
7 (sub fan)
Radiator
Type Down flow, pressure type
Core dimensions Width
×
Height
×
Thickness
AT: 691.5
×
340
×
16 mm (27.22
×
13.39
×
0.63 in)
MT: 691.5
×
340
×
27 mm (27.22
×
13.39
×
1.06 in)
Pressure range in
which cap valve is
open
Coolant filler tank side
Above: 108
±
15 kPa
(1.1
±
0.15 kg/cm
2
, 16
±
2 psi)
Below:
−
1.0 to
−
4.9 kPa
(
−
0.01 to
−
0.05 kg/cm
2
,
−
0.1 to
−
0.7 psi)
Radiator side
Above only: 137
±
14.7 kPa
(1.40
±
0.15 kg/cm
2
, 20
±
2.1 psi)
Fins Corrugated fin type
Reservoir
tank
Capacity 0.5
2
(0.5 US qt, 0.4 Imp qt)