Subaru Legacy III (2000-2003 year). Manual - part 284

CO(H6DO)-34

COOLING

RADIATOR SUB FAN AND FAN MOTOR

10.Radiator Sub Fan and Fan 

Motor

A: REMOVAL

1) Disconnect battery ground cable.

2) Lift-up the vehicle.
3) Remove under cover.

4) Disconnect connector of sub fan motor.

5) Lower the vehicle.
6) Remove air intake duct.

7) Remove bolts which hold sub fan shroud to radi-
ator.
8) Remove radiator sub fan shroud through the un-
der side of vehicle.

B: INSTALLATION

Install in the reverse order of removal.

NOTE:
Refer to “COMPONENT” for tightening torque.
<Ref. to CO(H6DO)-3, COMPONENT, General
Description.>

C: DISASSEMBLY

1) Remove clip which holds motor harness onto
shroud.

2) Remove nut which holds fan itself onto fan motor
and shroud assembly.

FU-00009

LU-00095

CO-00135

IN-00071

CO-00129

CO-00131

CO-00136

CO(H6DO)-35

COOLING

RADIATOR SUB FAN AND FAN MOTOR

3) Remove screws which install fan motor onto
shroud.

D: ASSEMBLY

Assemble in the reverse order of disassembly.

NOTE:
Refer to “COMPONENT” for tightening torque.
<Ref. to CO(H6DO)-3, COMPONENT, General
Description.>

E: INSPECTION

1) Connect battery as shown in the figure.

Terminal

No. 1 (+) — No. 4 (

−−−−

): Low speed

No. 1 (+), No. 2 (+) — No. 4 (

−−−−

): Middle 

speed
No. 1 (+), No. 2 (+) — No. 3 (

−−−−

), No. 4 (

−−−−

): 

High speed

2) Make sure the sub-fan motor operates properly.
Replace it if it doesn't.

CO-00133

4 3

2 1

CO-00197

CO(H6DO)-36

COOLING

RESERVOIR TANK

11.Reservoir Tank

A: REMOVAL

1) Disconnect over flow hose from radiator filler
neck position.
2) Remove bolts which install reservoir tank onto
radiator main fan shroud.
3) Remove reservoir tank.

B: INSTALLATION

Install in the reverse order of removal.

Tightening torque:

4.9N·m (0.50 kgf-m, 3.6 ft-lb)

C: INSPECTION

Make sure the engine coolant level is between full
and low.

CO-00121

CO-00121

CO(H6DO)-37

COOLING

ENGINE COOLING SYSTEM TROUBLE IN GENERAL

12.Engine Cooling System Trouble in General

A: INSPECTION

Trouble

Corrective action

Over-heating

a. Insufficient engine coolant

Replenish engine coolant, inspect for leakage, and 
repair.

b. Malfunction of thermostat

Replace.

c. Malfunction of water pump

Replace.

d. Clogged engine coolant passage

Clean.

e. Improper ignition timing

Inspect and repair ignition control system.
<Ref. to EN(H6DO)-2, Basic Diagnostic Procedure.>

f. Clogged or leaking radiator

Clean or repair, or replace.

g. Improper engine oil in engine coolant

Replace engine coolant.

h. Air/fuel mixture ratio too lean

Inspect and repair fuel injection system.
<Ref. to EN(H6DO)-2, Basic Diagnostic Procedure.>

i. Excessive back pressure in exhaust system

Clean or replace.

j. Insufficient clearance between piston and cylinder

Adjust or replace.

k. Slipping clutch

Repair or replace.

l. Dragging brake

Adjust.

m. Improper transmission oil

Replace.

n. Defective thermostat

Replace.

o. Malfunction of electric fan

Inspect radiator fan relay, engine coolant temperature 
sensor or radiator motor and replace there.

Over-cooling

a. Atmospheric temperature extremely low

Partly cover radiator front area.

b. Defective thermostat

Replace.

Engine coolant 
leaks.

a. Loosened or damaged connecting units on hoses

Repair or replace.

b. Leakage from water pump

Replace.

c. Leakage from water pipe

Repair or replace.

d. Leakage around cylinder head gasket

Retighten cylinder head bolts or replace gasket.

e. Damaged or cracked cylinder head and crankcase Repair or replace.

f. Damaged or cracked thermostat case

Repair or replace.

g. Leakage from radiator

Repair or replace.

Noise

a. Defective timing chain

Replace.

b. Defective radiator fan

Replace.

c. Defective water pump bearing

Replace water pump.

d. Defective water pump mechanical seal

Replace water pump.