[RJLipscomb]

2006 LS V8 95k miles
This morning my wife told me that the check engine temp warning was displayed.
Mid day, while driving to downtown DC, the engine fan started humming and then the temp gauge started climbing to RED and the same warning came on. I could not just stop the car, so I made a few turns and hit a red light... turned off the engine, green light started the car and drove to the next light, engine off. I did this three times and then suddenly, temp gauge read normal and warning message was gone.

When I got home, checked the coolant level and it was low, added some fluid (too much) ran the engine for awhile and all was good. When the fan finally came on, it was very loud.

Any ideas? Replace thermostat? (will do this over the weekend).

Thanks