Subaru Legacy III (2000-2003 year). Service 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.
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