Engine Cooling System (H4SO): Diagnosis Subaru Outback BP

INSPECTION

Note. Radiator sub fan system is for model with A/C.

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1. DETECTING CONDITION: Condition (1): Engine coolant temperature is below 95°C (203°F) A/C switch is turned ON. Vehicle speed is below 19 km/h (12 MPH). Condition (2): Engine coolant temperature is above 100°C (212°F) A/C switch is turned OFF. Vehicle speed is below 19 km/h (12 MPH).
2. TROUBLE SYMPTOM: Radiator sub fan does not rotate under conditions (1) and (2) above.

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1. Lift-up the vehicle.
2. Remove under cover.
3. Remove drain cock to drain engine coolant from radiator. NOTE: Remove radiator cap so that engine coolant will drain faster.

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1. Fill engine coolant into radiator up to filler neck position. Engine coolant amount for refill: MT model; Approx. 6.8 l (7.2 US qt, 6.0 Imp qt) AT model; Approx. 6.7 l (7.1 US qt, 5.9 Imp qt) CAUTION: The SUBARU Genuine Coolant containing antifreeze and anti-rust agents is especially made for SUBARU engine, which has an aluminum crankcase. Always use SUBARU Genuine Coolant, 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 properly.
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 engine 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 properly.

Replace the thermostat if the valve does not close completely at an ambient temperature or if the following test shows unsatisfactory results.

Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and measure 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 temperature distribution. If the measured temperature is within the specified range, the condition of thermostat is normal.

1. Specified value: Starts to open: 76.0 - 80.0°C (169 - 176°F) Fully opens: 91°C (196°F)

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1. Disconnect battery ground cable.
2. Lift-up the vehicle.
3. Remove under cover.
4. Drain engine coolant completely. Refer to , Engine Coolant.
5. Disconnect connectors of radiator main fan (A) and sub fan (B) motor.
6. Disconnect radiator outlet hose from thermostat cover.
7. Disconnect ATF cooler hoses from radiator. (AT vehicles only)
8. Lower the vehicle.
9. Remove air intake duct.
10. Disconnect overflow hose.
11. Remove reservoir tank.
12. Disconnect radiator inlet hose from engine.
13. Remove radiator upper brackets.
14. Detach power steering hose from the clip on the radiator.
15. While slightly lifting radiator, slide it to left.
16. Lift radiator up and away from vehicle.

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1. Attach radiator mounting cushions to holes on the vehicle.
2. Install radiator while fitting radiator pins to cushions. NOTE: Fit pins on lower side of radiator into cushions on body side.
3. Install radiator brackets and tighten bolts. Tightening torque: 18 N.m (1.8 kgf-m, 13.0 ft-lb)
4. Attach power steering hose to the radiator.
5. Connect radiator inlet hose.
6. Install reservoir tank. Tightening torque: 4.9 N.m (0.50 kgf-m, 3.6 ft-lb)
7. Install air intake duct.
8. Lift-up the vehicle.
9. Connect ATF cooler hoses. (AT vehicles only)
10. Connect connectors to radiator main fan motor (A) and sub fan motor (B).
11. Connect radiator outlet hose.
12. Install under cover.
13. Lower the vehicle.
14. Connect battery ground cable.
15. Fill coolant. Refer to «ENGINE COOLANT»(ref-208362-S36705941042005120700000) .
16. Check ATF level. Refer to «INSPECTION»(ref-208395-S08573280712005120700000) .

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1. Remove radiator cap, top off radiator, and attach tester to radiator in place of cap.
2. Apply a pressure of 157 kPa (1.6 kg/cm 2 , 23 psi) to radiator to check if: Engine coolant leaks at/around radiator. Engine coolant leaks at/around hoses or connections. CAUTION: Engine should be off. Wipe engine coolant from check points in advance. Be careful to prevent engine coolant from spurting out when removing tester. Be careful not to deform filler neck of radiator when installing or removing tester.

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1. Attach radiator
2. Increase pressure until tester gauge pointer stops. Radiator cap is functioning properly if it holds the service limit pressure for five to six seconds. Standard pressure: 93 - 123 kPa (0.95 - 1.25 kg/cm 2 , 14-18 psi) Service limit pressure: 83 kPa (0.85 kg/cm 2 , 12 psi) CAUTION: Be sure to remove foreign matter and rust from the cap before installing tester. Otherwise, results of pressure test will be incorrect.

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1. Disconnect battery ground cable.
2. Lift-up the vehicle.
3. Remove under cover.
4. Disconnect connector of main fan motor.
5. Lower the vehicle.
6. Remove air intake duct.
7. Disconnect overflow hose.
8. Remove reservoir tank.
9. Remove radiator main fan motor assembly.

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

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