[s-cars] Good news for R12 A/C people

[Steve Marinello]

Been trying to find that solution myself, John.  My mini York gave up and
no one will rebuild it, so I figure it's time to go with the compressor
conversion.  I think they are not that difficult to come by, although I
don't remember the name right now, but the mounting bracket and other
fitting mods are another story.  Somewhere on a long dead computer, that
information exists, but it's probably outdated by now.

But at least the RS24 seems to be a great path to go to.  Thanks, Dave.


Steve


On Sun, Jul 7, 2013 at 11:27 PM, John <johnkarasaki at msn.com> wrote:

> Hey Dave,
>
> This is great information. Thanks!
>
> On a related note, do you know of a lighter, smaller, more efficient
> compressor to replace the heavy York urq compressor.
>
> John
>
> djdawson2 at aol.com wrote:
>
>
>
>
> Always been a quandary what to do with R12 cars as the refrigerant becomes
> less available and more expensive.
>
> I've never been a fan of converting R12 systems to R134... the pressure
> set points on the R12 system compressors and the phase change points for
> the R134 refrigerant are not optimally compatible, leading to less than
> great performance overall.  On top of that you have to go through the
> exercise and expense of changing out all your o-rings and attempting to
> purge all of the system's non-compatible oil, sometimes hoses, etc...
>
> In the past, a drop-in replacement has been a product called Autofrost,
> also known as R406A.  I've used this product over the years, and it
> performed quite well.  Additionally, it could be used to top off a low
> charge situation without removing the old R12.
>
> I recently depleted my remaining supply of the R406A, and when I attempted
> to order another cylinder, I found that it was no longer available.  The
> supplier advised that I try RS24, also known as R426A.
>
> I had just received my cylinder of RS24 when a fellow lister (Justin
> Riley) needed some help with the A/C in his freshly renovated '85 urq.  He
> had just replaced his receiver/dryer and compressor.  We evacuated his
> system for about an hour, and then charged it with the RS24.  Very quickly
> we were seeing vent temps in the 33-37 degree range, depending on engine
> speed (a little more speed = colder).
>
> Bottom line - impressive, and a viable alternative to those with R12 cars.
>
> You can read up on RS24 - but here are some highlights:
>
> - You can NOT top off a low R12 system with the RS24.  It must be
> completely evacuated and recharged.  Very strongly recommended that you
> replace the receiver/dryer when doing this
> - You do not have to worry about oil compatibility
>
> You can go here  http://www.rscool.com/RS-24.html ; to see the product
> charts, MSDS, etc..  Also available is a pressure chart which shows
> performance side by side of R12, R134, and RS24... clearly indicating why
> the RS24 is a far superior solution to converting to R134.
>
> Anyway... thought this might be interesting to folks like me - with a
> garage full of R12 cars.
>
> Dave
>
>
>
>
>
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