[urq] Good news for R12 A/C people

[djdawson2 at aol.com]

The hoses "don't care" what the refrigerant is, but in theory they can become contaminated with both non-compatible oil and refrigerant.  This is why some conversions suggest replacement of all components.

You can still get R12 if you are so inclined, but the price is high.  I don't know about availability in Europe.  In the US, I can still buy it because I'm certified and have the credentials to purchase it.  However, based on my recent experience with RS24, I don't see the point.

I do see, however, that RS24 appears to be available in at least the UK.  Also, RS24 is OK with just about any available lubricant, so that shouldn't be an issue.

BTW, it is said that original R12 hoses were designed to "seep" the refrigerant.  The newer hoses are supposed to be free of this "feature."

Dave

 

 

 

-----Original Message-----
From: Patrick Carlier <p.carlier at pandora.be>
To: urq <urq at audifans.com>
Sent: Mon, Jul 8, 2013 1:59 am
Subject: Re: [urq] Good news for R12 A/C people


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
>
>
>
>
>
> _______________________________________________
> Audifans urq mailing list
> Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
> http://www.audifans.com/kb/List_information
>
> Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/
> 

_______________________________________________
Audifans urq mailing list
Manage your list connection: http://www.audifans.com/mailman/listinfo/urq
http://www.audifans.com/kb/List_information

Pictures/Polls/Database at: http://autos.groups.yahoo.com/group/urquattro/