When I parked my '85 Westy at the campground for Buses by the Buoy
(Family and Friends Campground, Standish, Maine), I smelled the
unmistakable smell of coolant on the exhaust.  Crawling under confirmed
that one of the metal pipes (early '85 style), that runs forward under
the van, was "Weeping" due to rust.  The rusty portion was near the
engine, of course.

While there, I obtained from David Beierl, some Silicone Rescue Tape,
the stuff that stretches and moulds to itself but has no sticky of it's
own.  It's designed to work with coolant hoses among other things.  Any
way, I wrapped the rusty portion of that coolant pipe, and while
wrapping, the weep turned into a trickle that went away as I continued.
  I drove the van back to Houlton, Maine with the coolant system
pressurized (250 miles) and had no coolant loss.

That Rescue tape has earned a permanent place in my parts and tools stash!

Mike