low coolant light

ok my low coolant light is on, yet when i looked inside my radiator it was full, the light goes on and off, usually goes on when i start the car and after driving for a while it will go off, why is this happeneing? do i have to fill my overflow tank?

You might have a bad connector..... I would check your wires and make sure nothing is loose.

ok nevermind i found out the problem, my overflow tank is cracked. im glad it was something so simple.