Foul HVAC odor

[Mellowmann]

Hello I'm a new member on this website and i didn't want to make my first post a complaint but I had this issue since the first week of purchase.

I bought a used 2008 2-dr hatch about two weeks ago and I just have this awful odor blowing out of the vents. It seems to be far more pronounced either after it rains and/or after I use the AC. The odor varies from light mustiness to a nasty stench.

I've been reading that apparently debris slowly collects on the evaporator assembly due to no cabin filter. or water not draining out of the container due to blockage and stagnating etc; possibly the evaporator being replaced. (I cannot hear any water sloshing around and didn't see any when i pulled back the carpet when checking the reservoir.) I don't know much about the TSB I heard about either. Is there any place where i could read up about it and what specifically it addresses and to solve this issue? Apparently a lot of people are having the same problem?

I just would like to stop smelling hobo odor every time I have to use the vents