Julianna, what state is your brother in?

On Fri, Sep 30, 2016 at 9:58 PM, Julianna Elligsen <mumbrue@gmail.com>
wrote:

> Hi John,
> My brother is a certified air conditioning mechanic.  I will forward your
> message to him, as he will I'm sure know.  I know he has worked on Vanagons
> before.
>
> Julianna
> 1991 VW Vanagon Westfalia (Ophelia)
> 1987 VW Vanagon Tintop (Armand)
>
>
>
> > On Sep 30, 2016, at 1:38 PM, John Rodgers <jrodgers113@GMAIL.COM> wrote:
> >
> > I have done some more thinking on this, and now have more questions.
> >
> > When the trinary switch failed, the AC system was not running. In fact,
> it
> > had never run while in my posession, even though I had serviced it to get
> > the compressor to run . I had it flushed, then put on  a new receiver
> > dryer, added a 134a conversion kit, pulled a vacuum check, and then put
> in
> > PAG 46 (I think that is the number recommended, and one  can of
> > refrigerant. The compressor should have turned om. It did not. I checked
> > the clutch, and it did not engage. I jumpered it and it worked fine.
> Also
> > turned the compressor  by hand with clutch engaged. Compressor turned
> fine.
> > I assume an electrical problem. And never turned the system on again. For
> > whatever reason, the shrader valve under the trinary switch failed,
> > allowing the refrigerant to blow out,  which in turn also blew out the
> > switch. Replacing the shraeder valve with another supposed good one from
> a
> > 134a converstion kit was not sufficient. It blew out as well, causing the
> > loss of refrigerant again.
> >
> > There was only the pressure of one can of refrigerant present, and the
> > system had not yet been run. So this shraeder valve failure really
> puzzles
> > me. As I see it, there was not enough pressure there to cause a failure,
> if
> > the valve seals were good.
> >
> > The fact of a failed trinary switch may have created the illusion of a
> > failed shraeder valve. The switch could have failed pressing on the valve
> > much like a thermostat will hot instead of cold. I am thinking of
> removing
> > the trinary switch again, replacing the shraeder valve and just leaving
> the
> > trinary switch off until it is recharged with one can of refrigerant. If
> it
> > holds, then I will install my new switch, and see if that holds. I'll
> turn
> > the system on, and  if  the compressor kicks on(it should - it did on my
> > '88 model), then I will finish recharging the system.
> >
> > I know a blockage somewhere could cause a problem, but the flush was done
> > with receiver/drier removed, and the crud wash out of the hoses in all
> both
> > directions intil it was clear.  The condenser section was done separately
> > from the evaporator section. I was right there when this was done, so I'm
> > fairly certain the system is clean.
> >
> > In preparing to do this again, if anyone feels I've missed something, I
> > would appreciate hearing about it.  Around here locally there's only one
> > guy  to talk to about this and his is a system he built, so its very much
> > not VW, and the  nearest shop is over in the big city.
> >
> > Any comments would sure be appreciated.
> >
> > Regards,
> >
> > John
>

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