Air Conditioner problems of the 2010 Mercedes Benz E350

Molds and mildew build up in the air condition ducts placing people who are susceptible for infection (people with weak immune system) at risk for fatal infection. The dealer stated that this is a known and common condition for this car because the ac box does not drain the condensed water. This is because the way the car was designed. The dealer recommended turning off the ac for 30 seconds while keeping just the fan on every time before turning off the car to dry up the condensed water on the ac coils, not practical. The dealer has a known service to disinfect the ac system but because of the car design could not guarantee that the condition will not return. There is no warning or any instructions in the manual regarding this potentially fatal condition for susceptible people.