I have a 98 Pontiac Grand am se. Im seeing a low coolant sensor light come on my car. I see no water leaks under my car or signs of water coming out on the driveway? I checked the coolant area it was low on coolant, put some antifreeze and drove it and still seeing this light come on. They finally found out it was the sensor. They just charged me for changing the sensor. Other people would have changed many other things and charge me a lot.