The ECT or engine coolant temperature sensor determines and measures the engine's temperature for proper engine operation and fuel economy. And it can also regulate the vehicle's engine's temperature. This temperature sensor works by measuring the temperature that the thermostat or coolant is giving off.
This is an OEM Cummins replacement part that is back by the Cummins Warranty.
NOTE: This Cummins 39203634 Coolant Temperature Sensor for the 1998 Dodge Ram trucks will not work on the 1998.5 to 2002 24 Valve 5.9L Cummins engine.