Ben

Given all the dire warnings about keeping some flow through the rear core, I
was wondering, why everyone, in any car, didn't experience the same rotting
heater core if they didn't keep the flow on all the time.  It's always good
to question the accepted wisdom and get people thinking.  Usually the wisdom
stands on good reason, but sometimes not.

Raymond

On 8/4/07, Benny boy <huotb@videotron.ca> wrote:
>
> 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.
>