Subaru Legacy IV (2008 year). Manual - part 289

CO(H4DOTC)-18

Thermostat

COOLING

5. Thermostat

A: REMOVAL

1) Set the vehicle on a lift.
2) Lift up the vehicle.
3) Remove the under cover.
4) Drain engine coolant completely. <Ref. to
CO(H4DOTC)-14, DRAINING OF ENGINE COOL-
ANT, REPLACEMENT, Engine Coolant.>
5) Disconnect the radiator outlet hose from thermo-
stat cover.

6) Remove the thermostat cover, and then remove
the gasket and thermostat.

B: INSTALLATION

1) Install a gasket to thermostat.

NOTE:
Use a new gasket.
2) Install the thermostat and thermostat cover.

NOTE:
Install with the jiggle pin facing upward.

Tightening torque:

12 N·m (1.2 kgf-m, 8.9 ft-lb)

3) Connect the radiator outlet hose to thermostat
cover.
4) Install the under cover.
5) Lower the vehicle.
6) Fill engine coolant. <Ref. to CO(H4DOTC)-14,
FILLING OF ENGINE COOLANT, REPLACE-
MENT, Engine Coolant.>

(A) Thermostat cover

(B) Gasket

(C) Thermostat

CO-02124

CO-02336

(A)

(C)

(B)

(A) Thermostat cover

(B) Gasket

(C) Thermostat

(D) Jiggle pin

CO-02337

(A)

T

(B)

(C)

(D)

CO(H4DOTC)-19

Thermostat

COOLING

C: INSPECTION

Replace the thermostat if the valve does not close
completely at an ambient temperature or if the fol-
lowing test shows unsatisfactory results.
• Inspection method
Immerse the thermostat and a thermometer in wa-
ter. Raise water temperature gradually, and mea-
sure the temperature and valve lift when the valve
begins to open and when the valve is fully opened.
During the test, agitate the water for even temper-
ature distribution. The measured value should
meet the specification.

NOTE:

• Leave the thermostat in the boiling water for
five minutes or more before measuring the valve
lift.
• Hold the thermostat with a wire or the like to
avoid contacting with container bottom.

Opening start temperature:

76 — 80°C (169 — 176°F)

Full open temperature:

91°C (196°F)

Total valve lift:

9.0 mm (0.354 in) or more

(A) Thermometer

(B) Thermostat

CO-02420

(A)

(B)

CO(H4DOTC)-20

Radiator

COOLING

6. Radiator

A: REMOVAL

CAUTION:
The radiator is pressurized. Wait until engine
cools down before working on the radiator.
1) Set the vehicle on a lift.
2) Remove the collector cover.
3) Disconnect the ground cable from battery.

4) Lift up the vehicle.
5) Remove the under cover.
6) Remove the heat shield cover from radiator. (AT
model)

7) Drain engine coolant completely. <Ref. to
CO(H4DOTC)-14, DRAINING OF ENGINE COOL-
ANT, REPLACEMENT, Engine Coolant.>

8) Disconnect the connectors of main fan motor
connector (A) and sub fan motor connector (B).

9) Disconnect the radiator outlet hose from thermo-
stat cover.

10) Disconnect the ATF cooler hoses from ATF
pipes. (AT model)

NOTE:
Plug the ATF pipe to prevent ATF from leaking.

11) Lower the vehicle.
12) Remove the air intake duct. <Ref. to
IN(H4DOTC)-9, REMOVAL, Air Intake Duct.>
13) Remove the reservoir tank. <Ref. to
CO(H4DOTC)-29, REMOVAL, Reservoir Tank.>

IN-00203

CO-02355

CO-00251

(A)

CO-00252

(B)

CO-02124

CO-00253

CO(H4DOTC)-21

Radiator

COOLING

14) Disconnect the radiator inlet hose (A) from the
radiator.
15) Remove the hood stay holder (B).

16) Disconnect the two coolant filler tank hoses
from the radiator.

17) Remove the radiator upper brackets.

18) Move the radiator to the left while lifting it up-
ward.
19) Lift the radiator up and away from vehicle.

B: INSTALLATION

1) Attach the radiator lower cushion to the hole on
the radiator lower bracket.

2) Install the radiator to vehicle.

NOTE:
Make pins on the lower side of radiator be fitted into
the radiator lower cushions on body side.
3) Install the radiator upper brackets and tighten
the bolts.

Tightening torque:

12 N·m (1.2 kgf-m, 8.9 ft-lb)

4) Connect the two coolant filler tank hoses to the
radiator.

5) Connect the radiator inlet hose (A).

CO-00255

(A)

(B)

CO-00256

CO-00040

CO-00041

CO-00040

CO-00256