1. REPLACEMENT OF ENGINE COOLANT
WARNING:
The radiator is of the pressurized type. Do not attempt to open the radiator cap immediately after the engine has been stopped.
1. Lift up the vehicle.
2. Remove the under cover.
3. Place a container under drain pipe.
4. Loosen and remove the drain plug to drain engine coolant into container.
5. For quick draining, open the radiator cap.
CAUTION:
• For turbo models, make sure to open the radiator cap on the filler tank side.
• Be careful not to spill coolant on the floor.
• Be careful not to spill engine coolant on the exhaust pipe. If the engine coolant is spilled on the exhaust pipe, wipe it off completely.
6. Drain the coolant from reservoir tank.
7. Tighten the radiator drain plug securely after draining coolant.
8. Pour the engine coolant into the radiator (or the coolant filler tank on turbo models) up to the filler neck position.
9. Fill engine coolant into the reservoir tank up to “FULL” level.
Recommended engine coolant:
Refer to “RM” section. 
Coolant capacity (fill up to “FULL” level)
10. Close the radiator cap (or the coolant filler tank cap on turbo models), and start the engine. Race 5 to 6 times at 3,000 rpm or less, then stop the engine. (Complete this operation within 40 seconds.)
11. Wait for one minute after the engine stops, then open the radiator cap (or the coolant filler tank cap on turbo models). If the engine coolant level drops, add engine coolant into the radiator (or the coolant filler tank on turbo models) up to the filler neck position.
12. Perform the procedures 10) and 11) again.
13. Install the radiator cap (or the coolant filler tank cap on turbo models) and reservoir tank cap properly.
14. Start the engine and operate the heater at maximum hot position and the blower speed setting to “LO”.
15. 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 by engine coolant pressure at this time, air purge seems to be mostly completed.
16. Stop the engine and wait until the engine coolant temperature drops to 30°C (86°F) or less.
17. Open the radiator cap (or the coolant filler tank cap on turbo models). If the engine coolant level drops, add engine coolant into the coolant filler tank up to the filler neck position and the reservoir tank to “FULL” level.
18. Install the radiator cap (or the coolant filler tank cap on turbo models) and reservoir tank cap properly.
19. Set the heater setting to maximum hot position and the blower speed setting to “LO” and start the engine. Perform racing at 3,000 rpm or less. If the flowing sound is heard from heater core, repeat the procedures from step 15).
2. RELATIONSHIP OF SUBARU COOLANT CONCENTRATION AND FREEZING TEMPERATURE
The concentration and safe operating temperature of the 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).
|
(1) |
Engine coolant specific gravity |
|
(2) |
Safe operating temperature |
|
(3) |
Concentration of coolant |
|
(4) |
Freezing temperature |
|
(5) |
Engine coolant temperature |
3. PROCEDURE TO ADJUST THE CONCENTRATION OF THE COOLANT
To adjust the concentration of coolant according to temperature, find the proper coolant concentration in the above diagram and replace the necessary amount of coolant with 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) of the undiluted solution of SUBARU coolant.
If a coolant concentration of 50% is needed, drain all the coolant and refill with the undiluted solution only.
|
(1) |
Amount of engine coolant |
|
(2) |
Necessary concentration of coolant |
|
(3) |
Concentration of coolant in the vehicle cooling system |