[Vwdiesel] AC woes

[Shirley, Mark R]

Like I mentioned to Loren, be carefull using PAG oil in an old
R12 system.  PAG oil is destroyed by free chlorine atoms that
came from the R12.  Ester may not work WELL, but it doesn't break
down from chlorine, and is still carried by the R134A.  To learn
a lot about AC systems, check out www.aircondition.com or contact
George Goble at Indiana Welding Supply.  That guy knows more about
AC systems than anyone I've ever run into.  He holds a patent on a
trinary compound refridgerant that's a drop in for R12 with mineral
oil.  Not as cheap as R134A, but does a great job and no changes required
other than your ports.

> -----Original Message-----
> From: Fernando Fiore [mailto:ecodiesel1 at hotmail.com]
> Sent: Wednesday, August 06, 2003 4:55 AM
> To: vwdiesel at vwfans.com
> Subject: Re: [Vwdiesel] AC woes
>
>
> Well,
>
> Flushing is done with a flush solution, easy enough.  As far
> as the method
> of changing out the oil, we do exactly what you said.
> Flushing through the
> compressor, I gave it more thought, is bad solely because of possible
> crud/old oil that can be trapped in the compressor, that
> would not flow out
> the other way freely (same goes with expansion valve, because of the
> orifice).  Flushing an A/C system is done with a flush kit,
> which consists
> of a air-pressurised bottle of flush that you push through
> the condenser and
> available lines.
> As far as the compatibility of oils, the problem (as I have
> been taught so
> far) is the compatability of mineral oil with 134a.  The oils
> I know of for
> 134a are Ester oil and PAG.  Through our time of service, as
> we started to
> do conversions fairly early in the game, we have found that ester oil
> sometimes does not do a very good job, and possibly has caused some
> premature compressor failures.  I recommend PAG oil for all
> conversions, but
> do look up what viscocity oil you need for your compressor
> (can find it
> online in a pinch).  Also, the most important property of
> these oils is to
> be able to mix with residual mineral oil... and they are
> advertised as such.
>   When this stuff started, the procedure stated that you must
> remove all
> traces of mineral oil from the system.  It has gotten only
> more lax from
> there.  I know of many conversions that included installing 2
> fittings,
> shooting some oil and refrigerant, and it cools.  But, flukes
> occur, and I
> wouldn't want to buy another compressor in a few years.  I
> know the right
> way to do it, and I see no reason to stray far from that.  I
> would say I did
> my conversion 50,000 miles ago. haven't touched it since.
>
>
>
> Fernando Fiore, "Nando"
>
> 84 VW Rabbit Diesel "GTI"
> 1/4= 21.249 @ 60.95mph
>
> 81 Audi 5000S Diesel
> 1/4= N/A
>
>
>
>
>
> >From: LBaird119 at aol.com
> >To: vwdiesel at vwfans.com
> >Subject: Re: [Vwdiesel] AC woes
> >Date: Wed, 6 Aug 2003 01:33:28 EDT
> >
> > > I was very meticulous with what
> > >  oil to use and the amount, as well as flushing
> everything I could (not
> >the
> > >  compressor, never flush into the compressor or exp.
> valve, that was my
> > >  teachings).
> >
> >   Two questions.  Ive wondered this since the "non
> compatible" oil issue
> >came up.  What do you flush it with?  Second is why not the
> compressor?
> >I'd think a dump, right oil, turn over some, dump and refill would be
> >acceptable.
> >This thn brings up the conversion factor.  If many say the
> oils are not
> >compatable then how are most conversions done since nearly none of
> >them do a flush?  :)
> >   Inquiring minds ya know.
> >      Loren
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