What changes did you make last before it started?
Since you change the stat, maybe coolant mixture too rich?
How about air pocket. Sometimes it a PITA to get all of the air out. I like to drill two small holes in the stat before I put it in. Stat pointing right direction?
Fan in good shape?
No oil in water, or oil in antifreeze?
Losing water?
Bad cap.
Add water wetter.
__________________
Frank
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