Re: [DML] Back to R12?

[Chris Almy <chris.almy@xxxxxxxxxxx>]

Do you know what type of oil they used during the conversion? If they used 
Ester oil, you are in luck as it's completely compatible with R-12 too. 
Just removing the R-134a fittings, vacuum and recharge with 2.2 pounds of 
R-12. If they used PAG oil, then you'll need to flush that out as it will 
not react well to R-12.

When I converted to R-134a, I switched out the hoses to the modern barrier 
ones and replaced the compressor at the same time (needed to be replaced 
anyway). The system stays nice and tight with no major leakage. You might 
want to consider doing this too because if you still have a slow leak, that 
R-12 is going to cost you a lot of money!

Chris

At 05:04 PM 4/18/2009 +0000, you wrote:
>A few years ago I had a leak in my AC which was repaired, then had the 
>system refilled with R134.  The oil was changed, new fittings installed, 
>and system vacuumed for over an hour.  The thing is, I have to refill 
>every year to two because the hoses leach 134 over time.  I am considering 
>going back to R12.  Has anyone done this after switching once?  Any 
>dangers or tips?
>
>My system always holds good vacuum, I think its just the smaller 134 
>molecules leak through the long hoses.
>
>Thanks,
>Andy


[Non-text portions of this message have been removed]



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