Here's my approach to lessening the heat coming from the front floor of the
Vanagon.  Instead of layering sound deadening material under the carpet,
which I'm sure is quite effective, I decided to take the simples approach. I
used quality pipe insulation of two different sizes to wrap the coolant and
heater pipes under the floor.  Which insulation?  When you go to Home Depot
they'll have the lighter, cheaper kind that compresses and doesn't bounce
back, and the more expensive kind.  Get the more expensive kind.  Also, get
the largest size for the coolant pipes and the next larges size for the
heater pipes.  Pick a bag of long, wide zip ties while you're there.  When
you get home, drop the spare tire,  crawl under the van with a working light
and do this:

http://i16.photobucket.com/albums/b7/misterpolak/WBX_transplant/HotFootFix.jpg

It takes about 15 minutes, and that includes the time to get a Warsteiner
from the fridge.

As you can see I also used couple of sheets of bitumenous shiny sticky
stuff.  I'm sure it will help some to reduce the transmission of noise
coming from the screaming neighborhood squirrels as they're dodging my
Westy.  Squirrels are evil, you know.

Ok, now.. back to the last few more things I need to do before my 2.1L
transplant is running.

Cheers!

--
Chris S.
"Beware the Subie Vultures"