Subaru Legacy BN/BS (2015-2019) Service Manual: Replacement

1. Lift up the vehicle.

2. Remove the under cover. Front Under Cover > REMOVAL

3. Connect a hose with inner diameter of φ8 mm (0.315 in) to the drain outlet of the radiator.

4. Loosen the drain plug to drain engine coolant into a container.

NOTE:

5. Tighten the drain plug.

NOTE:

6. Remove the hose from the drain outlet of the radiator.

7. Install the under cover. Front Under Cover > INSTALLATION

During work, set the select lever to “P” or “N” range and do not shift the lever.

1. Pour cooling system conditioner through the filler neck.

2. Pour engine coolant into the radiator up to the filler neck position.

NOTE:

3. Fill engine coolant into the reservoir tank up to “FULL” level.

4. Close the radiator cap and start the engine. Race 5 to 6 times at 3,000 r/min or less, then stop the engine. (Complete this operation within 40 seconds.)

5. Wait for one minute after the engine stops, and open the radiator cap. If the engine coolant level drops, add engine coolant into radiator up to the filler neck position.

6. Perform the procedures 4) and 5) again.

7. Attach the radiator cap and reservoir tank cap properly.

8. Start the engine and operate the heater at maximum hot position and the blower speed setting to “LO”.

9. Run the engine at 3,000 r/min or less until radiator fan starts and stops.

NOTE:

10. Stop the engine and wait until the engine coolant temperature lowers to 30°C (86°F) or less.

11. Open the radiator cap. If the engine coolant level drops, add engine coolant into the radiator up to the filler neck position and the reservoir tank to “FULL” level.

12. Attach the radiator cap and reservoir tank cap properly.

13. Set the heater setting to maximum hot position and the blower speed setting to “LO” and start the engine. Perform racing at 3,000 r/min or less. If the flowing sound is heard from the heater core, repeat the procedures from step 9).