i would check thermostat and water pump,
if you are adding coolant to it , than you have to check for blown head gasket
you can run a test on that and see.
i doubt at the 114k, unless you rant hot, and it went in the red and drove on it .
Most possible reasons
2- water pump
3- radiator check for good flow
4- make sure the coolant fans si not turning off intermittently
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