Another editon of "Name That Part"

[jassz]

We have recently purchased a 1981 300TD wagon. Today, while repairing another problem, we noticed this cracked hose. Not sure if you can see much in the picture, but it is about a 2in diameter hose leading in to the firewall. There is one on each side, and the one on the driver's side is cracked. I'm guessing this has something to do with heat to the cabin?? Any suggestions? And will good ole' duct tape do the trick??

Thanks!
(Great board, btw!)

PS... Ah nuts, it won't let me post the pic. I'll try and modify it and post it later!