From posts made before (search...) it is a PITA. From what I recall, you have to take at least a portion of the dash out to get to it as it's replaced from the inside. There was a post made once about how a guy jerry-rigged a new piece on the core to reconnect the hose, but IIRC, it didn't turn out well and leaked.

In any event, check junkyards for the part, it's not a cheap part to get new.

Good luck and let us know how it turns out.

-Gonzo