Subaru Legacy IV (2008 year). Manual - part 85

CO(H4SO)-26

Radiator Sub Fan and Fan Motor

COOLING

9. Radiator Sub Fan and Fan 

Motor

A: REMOVAL

1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.

3) Lift up the vehicle.
4) Remove the under cover.
5) Remove the connector (B) of radiator sub fan
motor.

6) Remove the heat shield cover. (AT model)

7) Remove the ATF hose from the clip of the radia-
tor sub fan motor assembly. (AT model)
8) Lower the vehicle.
9) Remove the air intake duct (rear). <Ref. to
IN(H4SO)-8, REMOVAL, Air Intake Duct.>
10) Drain approximately 2.0 

2 of coolant. <Ref. to

CO(H4SO)-13, DRAINING OF ENGINE COOL-
ANT, REPLACEMENT, Engine Coolant.>

11) Disconnect the radiator inlet hoses from the en-
gine.

12) Remove the bolts which hold the radiator sub
fan shroud to the radiator.

13) Remove the radiator sub fan motor assembly
from underneath the vehicle.

IN-00203

CO-02466

(B)

CO-02355

CO-00277

CO-00101

CO(H4SO)-27

Radiator Sub Fan and Fan Motor

COOLING

B: INSTALLATION

Install in the reverse order of removal.

Tightening torque:

7.5 N·m (0.8 kgf-m, 5.5 ft-lb)

Tightening torque:

3 N·m (0.3 kgf-m, 2.2 ft-lb)

C: DISASSEMBLY

1) Remove the clip which holds the fan motor con-
nector to the shroud.
2) Remove the nuts which hold the fan motor.

3) Remove the bolts which hold fan motor onto shroud.

D: ASSEMBLY

Assemble in the reverse order of disassembly.

Tightening torque:

5 N·m (0.5 kgf-m, 3.7 ft-lb)

Tightening torque:

3.4 N·m (0.3 kgf-m, 2.5 ft-lb)

CO-00101

CO-02355

CO-00097

CO-00098

CO-00098

CO-00097

CO(H4SO)-28

Reservoir Tank

COOLING

10.Reservoir Tank

A: REMOVAL

1) Disconnect the over flow hose connecting to the
radiator from the reservoir tank.
2) Push in the hook (A), and pull the reserve tank in
the direction of the arrow to remove.

B: INSTALLATION

Install in the reverse order of removal.

C: INSPECTION

Make sure the engine coolant level is between
“FULL” and “LOW”.

(A)

CO-00279

CO(H4SO)-29

Engine Cooling System Trouble in General

COOLING

11.Engine Cooling System Trouble in General

A: INSPECTION

Trouble

Possible cause

Corrective action

Overheating

a. Insufficient engine coolant

Replenish engine coolant, inspect for leakage, and 
repair it if necessary.

b. Loose timing belt

Repair or replace timing belt tensioner.

c. Oil on timing belt

Replace.

d. Malfunction of thermostat

Replace.

e. Malfunction of water pump

Replace.

f. Clogged engine coolant passage

Clean.

g. Improper ignition timing

Inspect and repair ignition control system.
<Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>

h. Clogged or leaking radiator

Clean, repair or replace.

i. Engine oil mixed in engine coolant

Replace the engine coolant. If defective is not improved, 
check, repair and replace the engine parts.

j. Air/fuel mixture ratio too lean

Inspect and repair the fuel injection system. <Ref. to 
EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>

k. Excessive back pressure in exhaust system

Clean or replace.

l. Insufficient clearance between piston and cylinder

Adjust or replace.

m. Slipping clutch

Repair or replace.

n. Dragging brake

Adjust.

o. Defective radiator fan

Inspect the radiator fan relay, engine coolant tempera-
ture sensor or fan motor and replace them.

Over-cooling

a. Ambient 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 cylinder block Repair or replace.

f. Damaged or cracked thermostat cover

Repair or replace.

g. Leakage from radiator

Repair or replace.

Noise

a. Timing belt problem

Replace.

b. Defective radiator fan

Replace.

c. Defective water pump bearing

Replace water pump.

d. Defective water pump mechanical seal

Replace water pump.