I hosed the piss out of the car and no water got in. I was super excited about that. Put the interior all back together and took it for a drive. Today was hot and humid. Got home and the car was full of water again.

I had no idea what you were talking about the drain hose over the transmission but omg thank you for saying that. I went looking and found that it was missing.... The insulation was still there so it wasn't obvious the hose was gone until I reached up in there.

WHAT A PAINFUL PLACE TO REACH!!!

I got some hose in there temporarily and it seems to have fixed the last of my water issues. But my question is, what is supposed to be there? The nipple coming out of the HVAC box has a weird barb on just one side and it's at a strange angle, not pointing right at the hole. I have some ideas on how to fix it, but what's the actual correct fix here?

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1984 300TD -- summer daily driver
Many others that aren't Mercedes...