Just an update in case anyone was curious. A few months back I had discount tire flush the whole system out since after several weeks my usual shop didn't seem too concerned with returning my calls. I haven't overheated since. There is still an overflow issue I believe, as the engine does heat up if I sit still too long. I can't remember how high it gets, if it reached 200 or not, and it's hard to test now that winter is here.
