The previous owner of my 1982 Westfalia informed me when I purchased the
vehicle that the fridge would not light.  When I unscrewed the drain pipe
located at the bottom of the front of the fridge, an avalanche of rust came
pouring out.  I connected the 12V power air pump I had received for
Christmas and blew the debris up and out of the drain pipe.  I think (and
hope) the debris all exited the external flue vent.  The fridge lit up right
away and has worked flawlessly since.

-bret

1982 Diesel Westfalia
Saint George, Utah