Subaru Legacy III (2000-2003 year). Manual — part 437

CO(H4DOSTC)-2

COOLING

GENERAL DESCRIPTION

1. General Description

A: SPECIFICATIONS

Cooling system

Electric fan + Forced engine coolant circulation sys-

tem

Total engine coolant capacity

2

(US qt, Imp qt)

MT: Approx. 7.7 (8.1, 6.8)

AT: Approx. 7.6 (8.0, 6.7)

Water pump

Type

Centrifugal impeller type

Discharge performance I

Discharge

20

2

(5.3 US gal, 4.4 Imp gal)/min.

Pump speed—Discharge pres-
sure (pressure leak)

760 rpm — 2.9 kPa [0.3 mAq (1.0 ftAq)]

Engine coolant temperature

85

°

C (185

°

F)

Discharge performance II

Discharge

100

2

(26.4 US gal, 22.0 Imp gal)/min.

Pump speed—Discharge pres-
sure (pressure leak)

3,000 rpm — 49.0 kPa [5.0 mAq (16.4 ftAq)]

Engine coolant temperature

85

°

C (185

°

F)

Discharge performance III

Discharge

200

2

(52.8 US gal, 44.0 Imp gal)/min.

Pump speed—Discharge pres-
sure (pressure leak)

6,000 rpm — 225.4 kPa [23.0 mAq (75.5 ftAq)]

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 impel-
ler 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

Valve bore

35 mm (1.38 in)

Radiator fan

Motor

75 W (main fan)

75 W (sub fan)

Fan diameter

×

Blade

300 mm (11.81 in)

×

5 (main fan)

300 mm (11.81 in)

×

4 (sub fan)

Radiator

Type

Down flow, pressure type

Core dimensions

691.5

×

340

×

16 mm

(27.22

×

13.39

×

0.63 in)

Pressure range in which cap valve is open or closed

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)

Fins

Corrugated fin type

Reservoir
tank

Capacity

0.5

2

(0.5 US qt, 0.4 Imp qt)

CO(H4DOSTC)-3

COOLING

GENERAL DESCRIPTION

B: COMPONENT

1. WATER PUMP

(1) Thermostat case

(5) Gasket

Tightening torque: N·m (kgf-m, ft-lb)

(2) Gasket

(6) Heater by-pass hose

T1: First 12 (1.2, 8.7)

Second 12 (1.2, 8.7)

(3) Thermostat

(7) Coolant filler tank by-pass hose

(4) Water pump ASSY

(8) Water by-pass hose

T2: 6.5 (0.66, 4.8)

( 1 )

( 2 )

( 3 )

( 4 )

( 5 )

( 6 )

( 7 )

T2

( 8 )

T2

T2

T1

T1

CO-00201

CO(H4DOSTC)-4

COOLING

GENERAL DESCRIPTION

2. RADIATOR AND RADIATOR FAN

(1) Radiator lower cushion

(14) Radiator main fan and main fan

motor ASSY

(25) ATF outlet hose B (AT vehicles

only)

(2) Radiator

(3) Radiator upper cushion

(15) Radiator outlet hose

(26) ATF inlet hose B (AT vehicles

only)

(4) Radiator upper bracket

(16) Radiator drain plug

(5) Clamp

(17) Engine coolant filler tank

(27) ATF pipe (AT vehicles only)

(6) Radiator inlet hose

(18) Engine coolant filler tank cap

(7) Engine coolant reservoir tank cap

(19) Engine coolant hose

Tightening torque: N·m (kgf-m, ft-lb)

(8) Overflow hose

(20) Radiator lower bracket

T1: 3.4 (0.35, 2.5)

(9) Engine coolant reservoir tank

(21) O-ring

T2: 4.4 (0.45, 3.3)

(10) Overflow pipe

(22) ATF hose clamp (AT vehicles

only)

T3: 4.9 (0.50, 3.6)

(11) Sub fan shroud

T4: 18 (1.8, 13.0)

(12) Radiator sub fan and sub fan

motor ASSY

(23) ATF outlet hose A (AT vehicles

only)

T5: 12 (1.2, 8.7)

(13) Main fan shroud

(24) ATF inlet hose A (AT vehicles

only)

CO-00145

T3

(7)

(18)

(17)

(5)

(5)

(19)

(9)

T3

T3

T5

T2

T2

T1

(13)

(11)

(14)

(5)

(5)

(6)

(8)

T4

(5)

(15)

(1)

(2)

(20)

(16)

(3)

(4)

(10 )

(21)

(12)

T1

(24)

(25)

(22)

(22)

(22)

(22)

(22)

(22)

T5

(26)

(27)

(23)

CO(H4DOSTC)-5

COOLING

GENERAL DESCRIPTION

C: CAUTION

• Wear working clothing, including a cap, protec-
tive goggles, and protective shoes during opera-
tion.
• Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust or dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly, and replacement.
• Be careful not to burn your hands, because each
part in the vehicle is hot after running.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or safety stands at the specified
points.
• Before disconnecting electrical connectors of
sensors or units, be sure to disconnect ground ca-
ble from battery.