A few weeks ago my "low coolant" light came on and I put some more coolant in after checking levels. I think whatever sensor that measures the level is broken because the light goes on and off regularly. It will stay on for about 10 mins and then go off for a little bit and then come back on agian. and it doesnt matter if im moving or not, i've had it turn off and on within the lenght of a red light. Am i right to replace the sensor and does anyone know where it is?