This thermostat switch is a replacement part designed for Audi 100 and Audi 200 models equipped with engine codes CN, WJ, WS, WK or KJ, with switching thresholds at 112 °C and 105 °C. In the context of restoration or maintenance of a classic vehicle, the proper operation of this thermal switch is essential to ensure correct regulation of the cooling circuit. A faulty thermostat switch can lead to engine overheating or fan malfunction, compromising the reliability of the system. Replacing this part with a new and compliant reference is a key step in keeping these automobiles in optimal working order.