List,

I will take this a step in another direction.  I have replace plenty of
Vanagon head gaskets as I am now running my 19th.  I don't see any
indication that the coolant corrodes the heads at all.  I have never
seen any corrosion in the water jacket areas of the heads.  I have seen
corrosion under the rubber head gasket which leads me to believe that it
is condensation that corrodes the heads.  I think that a bus that has
made more short trips than long trips is affected more.

Walt

gary hradek wrote:
snip:

>Dex-col is a organic based coolant which makes it
>phosphate free and it will not corrode the heads on a
>vanagon.
>
snip: