Subaru Legacy III (2000-2003 year). Service manual — part 440
CO(H4DOSTC)-14
COOLING
RADIATOR SUB FAN SYSTEM
NOTE:
Inspection by distributor service is required, because probable cause is deterioration of multiple parts.
12
CHECK HARNESS BETWEEN SUB FAN RE-
LAY TERMINAL AND SUB FAN MOTOR
CONNECTOR.
Measure resistance of harness between sub
fan motor connector and sub fan relay termi-
nal.
Connector & terminal
(F16) No. 2 — (F28) No. 20:
Is the measured value less than the specified
valve?
1
Ω
Repair open circuit
in harness
between sub fan
motor and sub fan
relay connector.
13
CHECK HARNESS BETWEEN SUB FAN RE-
LAY AND ECM.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between
sub fan relay connector and ECM connec-
tor.
Connector & terminal
(F28) No. 22 — (B134) No. 13:
Is the measured value less than the speci-
fied valve?
1
Ω
Repair open circuit
in harness
between sub fan
relay and ECM.
14
CHECK POOR CONTACT.
Check poor contact in connector between sub
fan and ECM.
Is there poor contact in connector between sub
fan motor and ECM?
There is poor contact.
Repair poor con-
tact connector.
Contact with dis-
tributor service.
Step
Value
Yes
No
CO(H4DOSTC)-15
COOLING
ENGINE COOLANT
4. Engine Coolant
A: REPLACEMENT
1. DRAINING LOF ENGINE COOLANT
1) Lift-up the vehicle.
2) Remove under cover.
3) Remove drain cock to drain engine coolant into
container.
NOTE:
Remove radiator cap so that engine coolant will
drain faster.
2. FILLING OF ENGINE COOLANT
1) Fill engine coolant into radiator up to filler neck
position.
Engine coolant amount for refill:
MT model;
Approx. 7.7
2
(8.1 US qt, 6.8 Imp qt)
AT model;
Approx. 7.6
2
(8.0 US qt, 6.7 Imp qt)
CAUTION:
The SUBARU Genuine Coolant containing anti-
freeze and anti-rust agents is especially made
for SUBARU engine, which has an aluminum
crankcase. Always use SUBARU Genuine Cool-
ant, since other coolant may cause corrosion.
2) Fill engine coolant into reservoir tank up to upper
level.
3) Attach radiator cap and reservoir tank cap prop-
erly.
4) Warm-up engine completely for more than five
minutes at 2,000 to 3,000 rpm.
5) If engine coolant level drops in radiator, add en-
gine coolant to filler neck position.
6) If engine coolant level drops from upper level of
reservoir tank, add engine coolant to upper level.
7) Attach radiator cap and reservoir tank cap prop-
erly.
B: INSPECTION
1. RELATIONSHIP LOF SUBARU COOL-
ANT CONCENTRATION AND FREEZING
TEMPERATURE
The concentration and safe operating temperature
of the SUBARU coolant is shown in the diagram.
Measuring the temperature and specific gravity of
the coolant will provide this information.
[Example]
If the coolant temperature is 25
°
C (77
°
F) and its
specific gravity is 1.054, the concentration is 35%
(point A), the safe operating temperature is
−
14
°
C
(7
°
F) (point B), and the freezing temperature is
−
20
°
C (
−
4
°
F) (point C).
CO-00083
CO-00010
FULL
LOW
Full level
Low level
CO-00062
1.000
1.010
–40
(–40)
1.020
1.030
1.040
1.050
1.060
(1.054)
1.070
C
B
A
1.080
1.090
1.100
–30
(–22)
–20
(–4)
–10
(14)
0
(32)
10
10%
20%
30%
40%
50%
60%
(50)
20
25
˚C
(77
˚F)
(68)
30
(86)
40
(104)
50
(122)
Specific gravity
of coolant
Safe operating temperature
Concentration
of coolant
Freezing
temperature
Coolant temperature ˚C (˚F)
CO(H4DOSTC)-16
COOLING
ENGINE COOLANT
2. PROCEDURE LTO ADJUST THE CON-
CENTRATION OF THE COOLANT
To adjust the concentration of the coolant accord-
ing to temperature, find the proper fluid concentra-
tion in the above diagram and replace the
necessary amount of coolant with an undiluted so-
lution of SUBARU genuine coolant (concentration
50).
The amount of coolant that should be replaced can
be determined using the diagram.
[Example]
Assume that the coolant concentration must be in-
creased from 25% to 40%. Find point A, where the
25% line of coolant concentration intersects with
the 40% curve of the necessary coolant concentra-
tion, and read the scale on the vertical axis of the
graph at height A. The quantity of coolant to be
drained is 2.1 liters (2.2 US qt, 1.8 Imp qt). Drain
2.1 liters (2.2 US qt, 1.8 Imp qt) of coolant from the
cooling system and add 2.1 liters (2.2 US qt, 1.8
Imp qt) of the undiluted solution of SUBARU cool-
ant.
If a coolant concentration of 50% is needed, drain
all the coolant and refill with the undiluted solution
only.
CO-00063
10
0
1
(1.1,
0.9)
(2.1,
1.8)
(3.2,
2.6)
2
45%
40%
35%
30%
25%
20%
15%
10%
20
30
40
50
3
A
Quantity of coolant to be
drained (US qt, lmp qt)
Necessary concentration
of coolant
Concentration of coolant in
the vehicle cooling system %
Concentration of coolant in vehicle
and quantity to be drained
CO(H4DOSTC)-17
COOLING
WATER PUMP
5. Water Pump
A: REMOVAL
1) Disconnect ground cable from battery.
2) Lift-up the vehicle.
3) Remove under cover.
4) Drain engine coolant completely.
<Ref. to CO(H4DOSTC)-15, DRAINING LOF EN-
GINE COOLANT, REPLACEMENT, Engine Cool-
ant.>
5) Remove radiator under cover.
6) Disconnect connectors from radiator main fan
(A) and sub fan (B) motors.
7) Remove bolt and clamps, and then remove wa-
ter by-pass pipe. (MT model)
8) Disconnect radiator outlet hose (A) and heater
hose (B) from water pump.
9) Disconnect water by-pass hose (C) and oil cool-
er hose (D).
10) Lower the vehicle.
11) Remove air intake duct.
12) Disconnect overflow hose.
13) Remove reservoir tank.
14) Remove radiator main fan and sub fan assem-
blies. <Ref. to CO(H4DOSTC)-28, REMOVAL, Ra-
diator Main Fan and Fan Motor.> and <Ref. to
CO(H4DOSTC)-30, REMOVAL, Radiator Sub Fan
and Fan Motor.>
FU-00009
( A )
( B )
CO-00084
CO-00147
( A )
( B )
( C )
( D )
CO-00148
IN-00059
CO-00086
CO-00087
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