Subaru Legacy III (2000-2003 year). Manual - part 74

CO(H4SO)-4

COOLING

GENERAL DESCRIPTION

2. RADIATOR AND RADIATOR FAN

(1) Radiator lower cushion

(12) Main fan shroud

(19) ATF inlet hose B (AT vehicles 

only)

(2) Radiator

(13) Radiator main fan and main fan 

motor ASSY

(3) Radiator upper cushion

(20) Radiator outlet hose

(4) Radiator upper bracket

(14) ATF hose clamp (AT vehicles 

only)

(21) Radiator drain plug

(5) Clamp

(22) O-ring

(6) Radiator inlet hose

(15) ATF inlet hose A (AT vehicles 

only)

(23) Radiator lower bracket

(7) Engine coolant reservoir tank cap

(8) Overflow hose

(16) ATF outlet hose A (AT vehicles 

only)

Tightening torque: N·m (kgf-m, ft-lb)

(9) Engine coolant reservoir tank

T1: 4.4 (0.45, 3.3)

(10) Sub fan shroud

(17) ATF pipe (AT vehicles only)

T2: 12 (1.2, 8.7)

(11) Radiator sub fan and sub fan 

motor ASSY

(18) ATF outlet hose B (AT vehicles 

only)

T3: 18 (1.8, 13.0)

T4: 3.4 (0.35, 2.5)

T5: 4.9 (0.50, 3.6)

(19)

(15)

(14)

(14)

(14)

(14)

(14)

(14)

( 7 )

( 8 )

CO-00081

T5

T5

T2

T2

T1

T1

T4

T4

T3

T5

( 1 )

( 2 )

( 3 )

( 4 )

( 5 )

( 5 )

( 5 )

( 5 )

( 6 )

( 9 )

(10)

(11)

(12)

(13)

(16)

(17)

(18)

(20)

(21)

(22)

(23)

CO(H4SO)-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.

D: PREPARATION TOOL

ILLUSTRATION

TOOL NUMBER

DESCRIPTION

REMARKS

499977100

CRANKSHAFT PUL-
LEY WRENCH

Used for fixing crankshaft pulley when loos-
ening and tightening crankshaft pulley bolts. 
(2500 cc model)

499977400

CRANKSJAFT PUL-
LEY WRENCH

Used for fixing crankshaft pulley when loos-
ening and tightening crankshaft pulley bolts. 
(2000 cc model)

18231AA010

CAMSHAFT 
SPROCKET 
WRENCH

• Used for removing and installing camshaft 
sprocket.
• Camshaft sprocket wrench (499207100) is 
also available. 

ST-499977100

ST-499977400

ST18231AA010

CO(H4SO)-6

COOLING

RADIATOR MAIN FAN SYSTEM

2. Radiator Main Fan System

A: SCHEMATIC

CO-00169

2

1

4

3

21

22

24

20

8

7

5

9

20A

20A

SUB FAN

RELAY

AIR CONDITIONING RELAY HOLDER

SUB FAN

MOTOR

MAIN FAN

MOTOR

MAIN FAN

RELAY

F28

F16

F66

F27

1

2

F17

B100

F2

B72

1

2

NO. 18

NO. 17

SBF-4

SBF-1

IGNITION 
SWITCH

B72

3 4

1 2

B134

1 2

3 4

5 6

7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

24 25

26 27 28 29

30 31 32 33

34 35

BATTERY

B134

ECM

F16

F17

2 1

F27

1

2

3

4

5 6 7

8
9

11

10

13

12

14

21

20

23

22

24

31

30

33

32

34

16

15

17

18
19

26

25

27

28
29

35

36

F66

F28

: 14
: 3

: 13
: 12

WITH OBD
WITHOUT OBD

1

*

2

*

WITH OBD
WITHOUT OBD

1

*

2

*

7

6

F2

3 4

1 2

8 9 10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

5 6

7

CO(H4SO)-7

COOLING

RADIATOR MAIN FAN SYSTEM

B: INSPECTION

DETECTING CONDITION:
Condition:
• Engine coolant temperature is above 95

°

C (203

°

F).

• Vehicle speed is below 19 km/h (12 MPH).
TROUBLE SYMPTOM:
• Radiator main fan does not rotate under the above conditions.

Step

Value

Yes

No

1

CHECK POWER SUPPLY TO MAIN FAN MO-
TOR.

CAUTION:

Be careful not to overheat engine during re-
pair.

1) Turn ignition switch to OFF.
2) Disconnect connector from main fan motor.
3) Start the engine, and warm it up until 

engine coolant temperature increases over 
95

°

C (203

°

F).

4) Stop the engine and turn ignition switch to 

ON.

5) Measure voltage between main fan motor 

connector and chassis ground.

Connector & terminal

(F17) No. 2 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 2.

Go to step 5.

2

CHECK GROUND CIRCUIT OF MAIN FAN 
MOTOR.
1) Turn ignition switch to OFF.
2) Measure resistance between main fan 

motor connector and chassis ground.

Connector & terminal

(F17) No. 1 — Chassis ground:

Is the measured value less than the speci-
fied valve?

5 

Ω

Go to step 3.

Repair open circuit 
in harness 
between main fan 
motor connector 
and chassis 
ground.

3

CHECK POOR CONTACT.
Check poor contact in main fan motor connec-
tor.
Is there poor contact in main fan motor con-
nector?

There is poor contact.

Repair poor con-
tact in main fan 
motor connector.

Go to step 4.

4

CHECK MAIN FAN MOTOR.
Connect battery positive (+) terminal to termi-
nal No. 2, and negative (

−

) terminal to terminal 

No. 1 of main fan motor connector.
Does the main fan rotate?

The main fan rotates.

Repair poor con-
tact in main fan 
motor connector.

Replace main fan 
motor with a new 
one.

5

CHECK POWER SUPPLY TO MAIN FAN RE-
LAY.
1) Turn ignition switch to OFF.
2) Remove main fan relay from A/C relay 

holder.

3) Measure voltage between main fan relay 

terminal and chassis ground.

Connector & terminal

(F66) No. 8 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 6.

Go to step 7.