I don't agree at all on the flow/no flow thing, hot VS cold coolant running
or not in the rear heater core, or front for that matter. I have a brand new
rear valve and heater in front of me, i can not blow air in it when close.

If any chemist on the list, speak!

Those heater core are simply old and if i may add, not so well located (they
always leak at the bottom), everytime i fix one or remove one it's full
of... stuff under this one, water, salt, coolant, coke, coffe.

Anyway, what is the purpose of that thread? if it leak, change it or remove
it. You will be good for another 15 years.

Ben

On Sat, 4 Aug 2007 11:21:31 -0400, John Meeks <vanagon@GMAIL.COM> wrote:

>Scott,
>I recall when I had my rear heater core apart that the valve had a
>small bypass groove or hole to allow some coolant to flow even with
>the valve in the off position. Can anyone else confirm this?
>John Meeks
>
>Vanagon Rescue Squad
>http://www.vanagonauts.com/Vanagon_Rescue_Squad74.htm
>
>'91 Multivan, '85 GL
>Northern Michigan
>KC8ZFN
>
>On 7/31/07, Scott Daniel - Shazam <scottdaniel@turbovans wrote:
>> It MUST either have the valve under the rear seat at least half on to keep
>> coolant circulating, or the rear heater should be disconnected.
>> LOTS of vanagons have the rear heater water valve closed, the coolant sits
>> in there and rots out the rear heater core.