if you join the two hoses you create a short circuit ..reducing flow to
front heater core.
I have not seen that blocking the hoses at the heater core causes any
problems..
though changing the T's to straight connectors is really the right way
to remove or bypass a rear heater.

I happen to have a brand new rear heater core in stock, that I would sell.
Scott, Oregon

On 7/3/2013 9:22 AM, Stuart MacMillan wrote:
> 1/2" copper plumbing will work.  And you are doing the right thing
> connecting them together rather than plugging them, which creates air
> pockets in the system.
>
> Stuart
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> Jamie Auch
> Sent: Wednesday, July 03, 2013 8:55 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Sprung a leak!
>
> I started to hear hissing under the back seat of my '89 auto 2.1 Westy. Anti
> freeze was coming out of rear heater core. What is the size of the hoses so
> that I can splice them together? This is a repair while traveling. Thanks.
>
> Jamie Auch
>
> Sent from my iPhone=
>