The coolant temperature sensor on a 2008 Chevy Impala is situated on the back of the motor close to the water siphon. A coolant temperature sensor (CTS) (otherwise called an ECT sensor or ECTS (motor coolant temperature sensor) is utilized to quantify the temperature of the coolant/radiator fluid blend in the cooling framework,giving a sign of how much intensity the motor is giving off.Coolant temperature sensors are utilized by the fuel the board framework to identify the motor's working temperature. Contingent upon the sensor data,the control unit adjusts the infusion time and terminating point to the working circumstances. The sensor is a temperature sensor with a negative temperature coefficient.