Where is the radiator cap of Audi A6L?

[OLorenzo]

The blue cap with white body on the right side of the engine is the high-level water tank, and the radiator is located behind the bumper. Method for draining the radiator: There is a drain screw at the bottom rear of the vehicle's radiator. Simply unscrew the drain screw to drain the water normally. It is important to note that the vehicle must be completely cooled before draining the radiator water to avoid the risk of burns. Function of the car radiator: The car radiator, also known as the heat exchanger, is a key component in the car's cooling system. Its function is to dissipate heat. The coolant absorbs heat in the water jacket, flows to the radiator to dissipate the heat, and then returns to the water jacket in a continuous cycle.