My thanks to all who responded regarding the black foam
that my camper's A/C is blowing out.  A couple of people
said it took as much as a year for theirs to finally stop
doing it, once it started, so it sounds like I've got to
open up the enclosure and at least check things out.
Views were mixed on whether the thing was actually useful,
but once I'm in there I suppose I may as well replace it.

I'll let the list know how it goes, assuming I actually get
around to it before it stops by itself.

                                      -Steven