Every rear heater core I've had leak, was followed by a set of head
gaskets....  :(

Jason

On Sun, May 11, 2014 at 10:43 PM, Dennis Haynes <d23haynes57@hotmail.com>wrote:

> Keep in mind the valve only reduces/stops flow. The core sees full system
> pressure. Pull it out of the housing. The leak is usually obvious where the
> tubes eroded through or the side tanks separated. If you must test, use
> some
> hoses and fittings and connect to a regulated air supply. Pressurize to 20
> pi and submerge in water. You will find the leak. Other common leak spots
> are the gasket between the core and valve and the bleeder screw breaking at
> the head.
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> JRodgers
> Sent: Sunday, May 11, 2014 10:37 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: 88 GL - Rear Heater Leak Test
>
> Have a leak in the rear heater. Made an absolute mess of the carpet and
> padding.
>
> I have it out of the vehicle. Any suggestions as to how to  leak test this
> thing. The summer/winter valve is new and has been working just fine with
> no
> leaks. Doesn't appear to leak there now.
>
> Open to ideas.
>
> Thanks.
>
> John
>