It looks like one problem has caused an even larger one. You may have already repaired the cause of the original overheat but the fact that you overheated it that severely has now caused severe internal damage like a cracked head or blown head gasket.
I would remove all the spark plugs and do a cooling system pressure test for a long period of time and see if any coolant gets into any of the cylinders or for that fact leaks anywhere.
Make sure you are installing the thermostat facing the correct way with the spring facing the engine side.
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Monday, December 25th, 2017 AT 9:22 AM