Cooling System (H4SO): Diagnosis Subaru Forester SG рестайлинг

INSPECTION

DETECTING CONDITION

1. Engine coolant temperature is above 95°C (203°F).
2. Vehicle speed is below 19 km/h (12 MPH). TROUBLE SYMPTOM

1. Radiator main and sub fans do not rotate under the above conditions.

SYMPTOM CHART

Scheme 33

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

Scheme 34

1. Fill cooling system conditioner into the filler neck of the radiator (the filler neck of the coolant filler tank on turbo models). COOLING SYSTEM PROTECTING AGENT: Cooling system conditioner (part number SOA345001)
2. Fill engine coolant into the filler neck of the radiator (the filler neck of the coolant filler tank on turbo models) up to the filler neck position. Coolant capacity (fill up to "FULL" level): SPECIFICATION GENERAL DESCRIPTION. > NOTE: The SUBARU Genuine Coolant containing antifreeze and anti-rust agents is especially made for SUBARU engine, which has an aluminum crank-case. Always use SUBARU Genuine Coolant, since other coolant may cause corrosion.
3. Fill engine coolant into the reservoir tank up to "FULL" level.
4. Close the radiator cap (on Non-turbo models) or the coolant filler tank cap (on turbo models), start the engine and race 5 to 6 times at less than 3,000 rpm, then stop the engine. (Complete this operation within 40 seconds.)
5. Wait for one minute after the engine stops, then open the radiator cap (on Non-turbo models) or the coolant filler tank cap (on turbo models). If the engine coolant level drops, add engine coolant into the radiator filler neck (on Non-turbo models) or the coolant filler tank filler neck (on turbo models) up to the filler neck position.
6. Perform the procedures 4) and 5) again.
7. Close the radiator cap (on Non-turbo models) or the coolant filler tank cap (on turbo models), and the reservoir tank cap.
8. Start the engine and operate the heater at maximum hot position and the blower speed setting to "LO"
9. Run the engine at 2,000 rpm or less until radiator fan starts and stops. NOTE: Be careful with the engine coolant temperature gauge to prevent overheating.
10. Stop the engine and wait until the engine coolant temperature lowers to 30°C (86°F).
11. Open the radiator cap (on Non-turbo models) or the coolant filler tank cap (on turbo models). If the engine coolant level drops, add engine coolant into the radiator filler neck (on Non-turbo models) or the coolant filler tank filler neck (on turbo models) up to the filler neck position. Then, pour the coolant into reservoir tank up to "FULL" level.
12. Close the radiator cap (on Non-turbo models) or the coolant filler tank cap (on turbo models), and the reservoir tank cap.
13. Set the heater setting to maximum hot position and the blower speed setting to "LO" and start the engine. Perform racing at less than 3,000 rpm. If the flowing sound is heard, repeat the procedures from 9) again.

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

1. Inspection method 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. The measured value should meet the specification.

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

Starting temperature to open

Non-turbo model 80 - 84°C (176 - 183°F)

Turbo model 76 - 80°C (169 - 176°F)

Fully opens

Non-turbo model 95°C (203°F)

Turbo model 91°C (196°F)

Valve lift: 9.0 mm (0.354 in) or more

Scheme 35

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

POSSIBLE CAUSE