T-stat bro.

As was already posted - you need a new thermostat.

Just making sure.

Im thinking that 10 years and 100k miles have put a lot of wear on the sensor and its a little off...

will be replacing and posting write up soon.

Thermostat. I kept getting low coolant warnings, and when I would check coolant, it would be filled to the top. Your T-stat is sticking in the open position, allowing coolant to flood the engine