Cooling System: Service and Repair
Engine CoolantREPLACEMENT
DRAINING OF ENGINE COOLANT
1. Lift-up the vehicle.
2. Remove the under cover.
3. Remove the drain plug to drain engine coolant into container.
NOTE: Remove the radiator cap so that engine coolant will drain faster.
4. Install the drain plug.
FILLING OF ENGINE COOLANT
1. Pour cooling system conditioner through the filler neck.
Cooling system protective agent: Cooling system conditioner (part number SOA6350G71)
2. Pour engine coolant into the radiator up to the filler neck position.
Coolant capacity (fill up to "FULL" level):
MT model: 6.4 L (6.8 US qt, 5.6 Imp qt)
AT model: 6.3 L (6.7 US qt, 5.5 Imp qt)
NOTE: 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.
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 less than 3,000 rpm, then stop the engine. (Complete this operation within 40 seconds.)
5. Wait for one minute after the engine stops, 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 at 44LO"
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.
^ If the radiator hose becomes harden with the pressure of engine coolant, air bleeding operation seems to be almost completed.
10. Stop the engine and wait until the engine coolant temperature lowers to 30°C (86°F).
11. Open the radiator cap. If the engine coolant level drops, add engine coolant into radiator up to the filler neck position and reservoir tank to the "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 less than 3,000 rpm. If the flowing sound is heard at this time, perform the procedures from 9) again.
INSPECTION
RELATIONSHIP OF SUBARU COOLANT CONCENTRATION AND FREEZING TEMPERATURE
The concentration and safe operating temperature of 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).
PROCEDURE TO ADJUST THE CONCENTRATION OF THE COOLANT
To adjust the concentration of coolant according to temperature, find the proper fluid concentration in the above diagram and replace the necessary amount of coolant, using an undiluted solution of SUBARU genuine coolant (concentration 50%).
The amount of engine coolant that should be replaced can be determined using the diagram.
[Example]
Assume that the engine coolant concentration must be increased from 25% to 40%. Find point A, where the 25% line of engine coolant concentration intersects with the 40% curve of the necessary engine coolant concentration, and read the scale on the vertical axis of the graph at height A. The quantity of coolant to be drained is 2.1 L (2.2 US qt, 1.8 Imp qt). Drain 2.1 L (2.2 US qt, 1.8 Imp qt) of coolant from the cooling system and add 2.1 L (2.2 US qt, 1.8 Imp qt) undiluted SUBARU coolant solution.
If a coolant concentration of 50% is needed, drain all the coolant and refill with the undiluted solution only.
