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Put it together, fix anything that shows up, go for a drive ! stop by your local parts store and pickup some cooling system cleaner , I’ve used Prestone cleaner , follow the instructions
One of my modern’s had 270,000 miles 10 years all original cooling system, it started running hotter than normal. I used the prestone flush and after it was running way to cool 150*F . I thought maybe the thermostat was stuck open, I put antifreeze back in and after a week of driving it was back to the normal temperature 194*F