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Subarus (I realize we are talking Toyota here) are notorious for running hot because for some reason or another (ususally a bad head gasket) there isn't enough water in the system. So my first plan of attack would be to get the nose of the car elevated higher than the rest of the car i.e. make the radiator cap the high point of the entire cooling system and make sure it is full of water/coolant. Make sure it is full when cold, then run it until the thermostat should open then keep adding water until everything is hot.
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