1、Applicable Models and Part Number: Engine coolant thermostat housing is suitable for A6 A7 A8 Q5 Q7. The part number for reference is 06E121111AD, direct replacement. 2、Precise Temperature Control: Utilizing high accuracy temperature control technology, the thermostat housing enables highly accurate temperature regulation, ensuring a constant indoor temperature. 3、Improved Driving Comfort: By regulating the interior temperature and maintaining a constant temperature, the thermostat housing provides a more comfortable driving environment for the driver. 4、Environmentally Friendly: By precisely controlling the engine's operating temperature, excessive coolant circulation is avoided, resulting in reduced fuel consumption and lower carbon dioxide emissions. 5、Safety Protection: By preventing engine damage due to excessive operating temperatures or difficulties starting the engine caused by low operating temperatures, the thermostat housing ensures driving safety.