Lengthy thread on Samba with lots of pro and con, as these things tend to go.  Searching on Coolant Pipe Repair gives you several threads, including a couple on non-GoWesty repairs that seem to work.  Before you spend the money...
TheSamba.com :: Vanagon - View topic - GoWesty Coolant Pipe Repair Kit - How Does It Work?
Stephen
  
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TheSamba.com :: Vanagon - View topic - GoWesty Coolant Pipe Repair Kit - Ho...
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    On Monday, March 19, 2018 6:37 PM, Jason <uberhare@GMAIL.COM> wrote:
 

 I have not tried this repair, but logically it should work well.
Personally I would try it long before the effort of changing the entire
pipes.

Jason

On Mon, Mar 19, 2018 at 1:45 PM, David McNeely <davmcneely40@gmail.com>
wrote:

> Has anyone used, know anything definitive (or at least more than I do)
> about the GoWesty product to repair the ends of the long coolant pipes
> under a Vanagon?  My 1991 Volkswagen Vanagon GL Campmobile with 2.1 L
> waterboxer and original plastic pipes has a leak at the end of one pipe.
> One mechanic shop recommended replacing with stainless.  But GoWesty has a
> repair kit with brass inserts for the hoses that is claimed on the GoWesty
> web site to be great.
>
> This one:
>
> http://www.gowesty.com/product/pipes-junctions/3643/
> coolant-pipe-repair-kit-?v=
>
> Another mechanic shop also recommended the stainless pipes, but when I
> showed the tech (very experienced long time VW including Vanagon
> professional) the kit on the GoWesty site, he thought it would serve quite
> well.
>
> At any rate, all comments will be welcome and hopefully useful.
>
> mcneely
>