You should really put winns or other brand flush in there
Run it to temp.
Empty refil with plain water upto temp again then flush threw with heater on high.
If your gona do the head have it checked at a proper shop.
could be the stat or the pump
but you are running a very very big risk of cooking the head letting it get to the high temps its only a matter of time
and for the price of a stat or wp the cost is going to be quite a lot more.
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