Most likely, your first "dump" resulted in and air pocket in the cooling system, which is still haunting you. You need to either get the car on a vacuum fill system while cold and get the air out, or search the terms "coolant system burp" and you will find info on how to get the air out of the system before it causes damage.
Good luck.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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