I had similar symptoms on my '91 Westy recently. Turned out to be old,
cracking, leaking-under-pressure-when-hot rubber hose leading from right
head to the coolant tank.

Bob Stevens
http://groups.msn.com/BobsPhotoShare

Steven Dodson wrote:
 >
 > I need some advice. I live 6 miles up a mountain road, it's quite steep
in
 > some places on the way up, especially the last half mile. A couple days
ago
 > I noticed a small (6" dia) puddle of coolant under the rear bumper. I
could
 > find no wet spots on the van. I ran some errands yesterday afternoon (it
was
 > warm out) and in the evening I saw a larger puddle, same area but now
much
 > larger (6 x 18"). I checked the coolant level and it looked fine. I did
find
 > some wet spots on sheet metal, directly under the pulleys. I could not
see a
 > source.
 >

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