I had a huge crack in my radiator and replaced the radiator around 2 months ago.
Ever since when the engine got warm the low water indicator comes on.
I see no loss of fluid.
No drips no runs.
Also when the car cools and I check the water level it is fine.
I figure it MIGHT be the radiator cap letting coolant out when the engine gets warm.
Either that or perhaps the sensor itself.
I checked the wiring and that looks good.

Does anyone else have any other ideas of what might be causing this problem?

Thanks!