[urq] Good news for R12 A/C people

[Patrick Carlier]

Speaking or R12   AC systems .

R12 hoses and o-rings are incompatible with fi R134 right ?.
How about the other way around ?
I have a bit of  R12 left , but need to replace some if not all 30 year 
hoses .
And "real"  R12 hoses are no longer made .
Can I use nowaday's hoses incombination with R12 ?

Same question for the lubricant .
R12 oil is nowhere  to be found in europe .
I do have a can of universal AC oil  .
Don't know if that would be any good .

Pat





----- Original Message ----- 
From: <djdawson2 at aol.com>
To: <urq at audifans.com>; <s-car-list at audifans.com>
Sent: Monday, July 08, 2013 4:39 AM
Subject: [urq] Good news for R12 A/C people


>
>
>
> 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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