Radiator cap
I think one important item to change frequently is the radiator cap. If the coolant system is not pressurized properly the engine does not cool right.
When I got my SVX the cooling fans would run constantly after the engine warmed up. I changed the cap and now the fans run for a minute or two and then shut off.
Feel the top radiator hose when the car is running it should be stiff.
I had to replace an engine recently on a 99 Outback which had blown head gaskets. Sure signs are bubbling in the overflow tank, and oil residue in the overflow tank as well.
Good luck. I think you are OK if it did not push fluid into the overflow again. Hopefully, you do not have head gasket problems.
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