If you're referring to the sensor that triggers the low coolant light then I would say to not even worry about getting a new one. It doesn't ready accurately anyways. My car had essentially ZERO coolant in the system and the light turned off after I filled the reservoir to the "full" line. Little did I know that the radiator was practically empty. I now rely on the amount of coolant in the radiator itself by taking the cap off to figure out when to put more coolant in.