Why is the heater tank of Audi a6 so perishable?

Hello, the main reasons for the damage of the warm air water tank are: first, the water tank leaks due to the long-term aging of the sealing ring; Secondly, the quality of the warm air tank is not good; Thirdly, the added antifreeze is not good enough to corrode the water tank; One case is that the pump circulation is not good or the thermostat can't be opened, and the high water temperature and pressure lead to suffocation of the water tank. I want to answer your satisfaction with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.