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I just recently did this and I can tell you that you will lose the majority of your coolant by changing both hoses. your best bet is to drain it completly, and fill with a new 50/50 mix of Subaru coolant, and distilled water. its VERY important to use subaru coolant, and it is highly reccomended to use distilled water which you can buy at any supermarket.
on the passenger side of the radiator at the bottom, there is a valve which will drain the system.
drain it completly, while the engine is cool.
replace the hoses making sure there is clearance between the upper hose and the radiator fans (this is why I had to replace mine)
fill the system NOT from the cap on top of the radiator, but from the small tank in front of the turbo, on the passenger side of the intake manifold. you can remove the cap on the radiator to get rid of the air pocket, but once the fluid reaches the top you will need to recap it, and there is still more fluid to add at the other reservoir.
you will need to "burp" the system, meaning once you fill the fluid to the top, you need to start the car & let it warm up. the thermostat will open, and you will need to add more coolant. top it off once again & then you are all set!
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