96 Audi a6 what is the sensor on bottom of radiator?

The sensor located at the bottom of the radiator on a 1996 Audi A6 is typically the coolant temperature sensor. This sensor monitors the temperature of the coolant as it exits the radiator and sends this information to the engine control unit (ECU) to help regulate engine performance and prevent overheating. If this sensor fails, it can lead to inaccurate temperature readings and potential engine issues.