You are correct, in that I am not too well read on HC-12a. The last time I
attended GM Training School was 1985 or so. HC-12a was verboten in the USA
at that time. Still might be in certified AC shops, which I was. Don't
know if propane based refrigerants are compatible with synthetic
oils except as I already stated. That's all I know about that.
Jim Hupy
Salem, Oregon
On Sat, Jul 17, 2021, 8:43 AM Emery Stora via Gmclist <
> James
> I still have to disagree with you on this.
> If you go to
www.duracool.com in their technical facts area you will find
> the statement “compatible with mineral and synthetic oils including PAG and
> ester oils”.
> I am very familiar with PAG and I have been installing Duracool in GMC
> Motorhome for many years including conversions to R134a and have had no
> problems with Duracool and PAG oil.
>
> Not sure when you had GM training school but I don’t think Duracool was
> around way back then.
>
>
> Emery Stora
>
> > The one oil that both refrigerants ARE compatible with is called POE,
> > which is Polyol Ester Oil.
> > If, when the R-134a was introduced into Dave's GMC that oil was used,
> then
> > HC-12a can be added to replace R-134a with no ill effects. Just Sayin,
> that
> > is a big IF.
> > Jim Hupy
> > Salem, Oregon
> >
> >
> >> Au Contraire' Emery.
> >> R-12 lube is mineral based.
> >> R-134a lube is not mineral oil, but is something called PAG which is a
> >> synthetic lube. According to the Rules and Laws, R-134a and R-12 cannot
> be
> >> mixed, that goes for HC-12a or "duracool" as well. Emery, you can do as
> >> you wish, but those are the facts as I learned them from GM Training
> >> School. Still have the books. I went and looked them up. Just what I was
> >> taught.
> >> Jim Hupy
> >> Salem, Oregon
> >>
> >> On Sat, Jul 17, 2021, 7:05 AM Emery Stora via Gmclist <
> >>
> >>> James
> >>> Duracool is compatible with the oil used with R12 and also compatible
> >>> with the oil used with R134a.
> >>> If the system was properly converted for R134a then Duracool can be
> >>> installed without changing anything.
> >>> Emery STORA
> >>> 77 Kingsley
> >>> Frederick CO
> >>>> If you have R-134a, and it was professionally installed, they used an
> >>> oil
> >>>> specifically compatible with that refrigerant. It will NOT BE
> compatible
> >>>> with either R-12 or Duracool type refrigerants. The system must be
> >>> pumped
> >>>> down, the dessicant/dryer replaced, and thoroughly flushed of all that
> >>> old
> >>>> lubricant. If you have an OEM compressor, it should be drained and
> >>> flushed,
> >>>> and new lube filled. If you don't flush and replace the lube, be
> >>> prepared
> >>>> for a system full of sludge.
> >>>> Jim Hupy
> >>>> Salem, Oregon
> >>>>> This coach was restored in 2013 and then sat for seven years. I've
> been
> >>>>> slowly recommissioning it.
> >>>>> The AC worked. Now it doesn't. Apparently a very slow leak. It has
> >>> no
> >>>>> pressure but it holds vacuum.
> >>>>> It had been converted to R134. I have a case of duracool.
> >>>>> So what do i need to know besides adding duracool and crossing
> fingers
> >>> ?
> >>>>> --
> >>>>> Dave & Ellen Silva
> >>>>> Hertford, NC
> >>>>> 76 Birchaven, 1-ton and other stuff
> >>>>> Currently planning the Great american Road Trip Summer 2021
> >>>>> It's gonna take a lot of Adderall to get this thing right.
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