watertemperaturesensororenginecoolanttemperature(ECT)sensorisscrewedintotheengine'sblock,cylinderheadorradiatorandisusedtodeterminethetemperatureoftheenginecoolant.AboutWaterTemperatureSensors.Thesensorisbasicallyathermistorthatchangesresistancewithtemperature. GENSET/GENERATOR parts water temperature sensor