I was driving home today, 25 miles, and noticed an exhaust leak coming
from under the hood.  When I got home and looked, there was a wad of
melted hoses on the passenger side of the engine.  No exhaust manifold
leak I can find, just a noise coming from a hose that goes to the
catalityc converter.  The combination valve is melted and the hoses
going to the air pump and up to the check valve are melted.  Any idea
what could cause this?  What should I do to start the repair.

                                               Thanks for your
assistance,

Louie