what causes dirty sock syndrome in my car is it under warranty
Most experts agree that dirty sock syndrome is caused by bacteria forming, although some people suggest that it is a fungal problem. The microbe grows on the heat pump coils and propagates because the coils are usually wet with condensation. The smell is most noticeable during the defrost cycle.
Dirty Sock Syndrome is actually caused by a combination of bacterial slime (biofilm) and mold, such as yeasts, that typically grow on the coils of the unit. The biofilm has been described as being like the slippery, slimy surface that develops inside a pet's water bowl.