https://www.audiforums.com/forum/sho...d.php?t=161746

 

Okay, I don't have an avant, so I haven't really dealt with this, but I'll try to help anyway.

Is that a rubber hose that the ribbed hose connects to at the bottom? If so, pull it out and get a hard plastic (or metal) hose coupling and add some more rubber hose, and then connect the plastic hose to that, either by insertion or by another coupling and clamps.

Otherwise, you can just get the coupling and clamps and connect the two pieces of the plastic hose together if the hose is in good enough shape. Might want to cut a little bit off of each side. I see you tried this and said it leaked but I don't know exactly what you did. I'd use sealant, clamps and I'd cut a little back...

 

There is a rubber hose that the ribbed hose is housed in. It usually surrounds the whole ribbed hose but I had to cut it away to gain access to the broken section. Think of the rubber hose as a slightly larger housing for the ribbed hose. The ribbed hose easily slides in and out of the rubber hose. They must have used the rubber hose to protect the headliner in case the ribbed hose broke. It also would serve as a channel to fish a whole new hose through the roof system, but that seems to risky to me.