You could still do it with the right valves. The blowoff part might be
harder than the vacuum but I bet there's something on a shelf out there
that would work for years and years.

On Wed, Oct 14, 2015 at 3:44 PM Eric Wunrow <VW@ericwunrow.com> wrote:

> (only I got this, so re-sent to entire list — I often do the same thing
> meownself, gotta hit "Reply All…")
>
> Dang… he's gotta be right!
>
>
> Anywho, when mine doesn't work, you can draw or blow air… this part's
> impossible to misinterpret.
>
>  Eric
>  Eric Wunrow Pictures
>
>  303. 988. 8717
>  VW@EricWunrow.com
>
>
>
>
> On Oct 14, 2015, at 11:45 AM, David Baronet <1947al@gmail.com> wrote:
>
> > Guys,....not a one way device. It pops off under overpressuring but
> sucks coolant back into the system when cooling off. Aone way "check" valve
> won't accomplish that.   David
> >
> > On Wed, Oct 14, 2015 at 12:25 PM, Eric Wunrow <VW@ericwunrow.com> wrote:
> > > Yes, mine are from Meyle.
> > >
> > > Jim, your inline valve idea is great!
> > >
> > >  Eric
> > >  Eric Wunrow Pictures
> > >
> > >  303. 988. 8717
> > >  VW@EricWunrow.com
> > >
> > >
> > > <EW Email Sig.gif>
> > >
> > > On Oct 14, 2015, at 8:08 AM, Jim Felder <jim.felder@GMAIL.COM> wrote:
> > >
> > >> You are exactly right, the one-way feature on the valve is something
> I have
> > >> know VW shops to argue about. When I had a 2.1, I would test them
> before
> > >> leaving the parts place because so many of them didn't work out of
> the box.
> > >> The "good" ones didn't last long, either. I suspect you might be
> buying a
> > >> brand called "Meyle Germany" but that is just the brand name some
> company
> > >> bought, and they could be made absolutely anywhere. You might try the
> > >> dealers but good luck with that.
> > >>
> > >> One of these days, all vanagon drivers are going to be using that cap
> > >> simply as a connection to a one-way valve from a third party, inline
> > >> between the reservoir tank and the overflow tank.
> > >>
> > >> Jim
> > >>
> > >> On Wed, Oct 14, 2015 at 2:41 AM Eric Wunrow <VW@ericwunrow.com>
> wrote:
> > >>
> > >>> I'm a total rookie compared to you guys, but wanted to note I've had
> at
> > >>> least three expansion tank (blue) cap failures in 23,000, full-time
> miles
> > >>> over 26 months on the road. I believe the failures are somewhat
> related to
> > >>> how many heating/cooling cycles they're asked to do.
> > >>>
> > >>> I only buy the German ones, and my test is if you can both suck and
> blow
> > >>> on the cap, it's toast (please keep the jokes to yourself).
> > >>>
> > >>> My understanding is the cap should only release pressure one
> direction —
> > >>> not two.
> > >>>
> > >>> Eric
> > >>> Eric Wunrow Pictures
> > >>>
> > >>> 303. 988. 8717
> > >>> VW@EricWunrow.com
> > >>>
> > >>>
> > >>>
> > >>>
> > >>> On Sep 28, 2015, at 3:27 PM, Stuart MacMillan <stuartmacm@GMAIL.COM>
> > >>> wrote:
> > >>>
> > >>>> Thanks Jim, the cap was replaced with an OEM cap when the water
> pump was
> > >>> done 13,000 miles ago, and the overflow tank doesn’t show any
> evidence of
> > >>> any spillage on or under it.  I’m thinking small leaks too, but I’d
> like to
> > >>> narrow it down.  The 2.1 has a lot more hoses than my 1.9!
> > >>>>
> > >>>>
> > >>>>
> > >>>> Stuart
> > >>>>
> > >>>>
> > >>>>
> > >>>> From: Jim Felder [mailto:jim.felder@gmail.com]
> > >>>> Sent: Monday, September 28, 2015 2:21 PM
> > >>>> To: Stuart MacMillan; vanagon@gerry.vanagon.com
> > >>>> Subject: Re: Missing coolant
> > >>>>
> > >>>>
> > >>>>
> > >>>> Old hoses leak microscopic amounts of coolant. Ive had it spray
> onto the
> > >>> engine in such small quantities that it would evaporate before you
> could
> > >>> see it. Tighten hoses, replace hoses is about all you can do. But you
> > >>> didn't mention testing the pressure cap. That can send a good deal of
> > >>> coolant into the expansion tank, which can drip on the road through
> the
> > >>> overflow and you won't know it.
> > >>>>
> > >>>>
> > >>>>
> > >>>> Jim
> > >>>>
> > >>>>
> > >>>>
> > >>>> On Mon, Sep 28, 2015 at 4:11 PM Stuart MacMillan <
> stuartmacm@gmail.com>
> > >>> wrote:
> > >>>>
> > >>>> Just when everything seems to be sorted out, it isn't.  Son's '87 is
> > >>> losing
> > >>>> over a quart of coolant every 400 miles, and I can't find any leaks.
> > >>> Rear
> > >>>> heater has been removed, and there is no odor from the front
> heater.  No
> > >>>> drips anywhere-engine plumbing, heads, transmission cooler,
> radiator, or
> > >>>> front heater valve.  No evidence of coolant mixing with either the
> > >>>> transmission fluid or engine oil, and that much coolant would
> certainly
> > >>> foam
> > >>>> oil.
> > >>>>
> > >>>>
> > >>>>
> > >>>> I'm wondering if it's burning coolant, but in my experience failed
> > >>> sealing
> > >>>> rings in Vanagons lead to over pressurization of the system, and
> that's
> > >>> not
> > >>>> happening. It also runs great. I sometimes notice a faint smell of
> > >>> burning
> > >>>> coolant at the engine compartment vents, but I can't find anything
> > >>> dripping
> > >>>> on the exhaust when the system is pressurized.
> > >>>>
> > >>>>
> > >>>>
> > >>>> Would investing in a UV leak detection kit tell me anything?  It
> would
> > >>> seem
> > >>>> losing this much coolant would show up somewhere.
> > >>>>
> > >>>>
> > >>>>
> > >>>> Any ideas?
> > >>>>
> > >>>>
> > >>>>
> > >>>> Stuart
> > >>>>
> > >>>
> > >>
> > >
> >
>