I have had my A/C ducts creaking over every bump and decided to finally do
something about it.  I had to take the entire unit down to clean the stinky dry
rotted foam from around the evaporator and decided to put Teflon grease on all
the joints and on the body contact points for the front A/C duct to see if it
would quiet the noise...

Well, I have been on some bumpy roads here in AZ and the noise is gone.  Now
I have other noises I need to remove.

Robert