AC refrigerant question.

01ragtop · Apr 27, 2008

01ragtop said:
EDIT: So no one is mislead: The website that I posted the link to regarding the oil Miscibility is owned by Autofrost or R406a. While the samples are real what they fail to mention on that page is that r406a will eventually break down mineral oil and become very discolored. It is recommended that you use a AB( Alkyl Benzene) refrigerant oil with either r406a or r414b, but now we are right back to square one with the r134a issue. So considering the fact that the oils at least should be changed, R134a is the better choice because it is not a blend of refrigerants like the R12 replacements. The blended replacements can frationalize and the different refrigerants will leak at different rates. In the case of Autofrost(r406a), it can leave you with a flammable substance.

There is a reason EVERY major auto manufacturer uses R134a

I want to clarify something:

In the above I meant to write R406a (autofrost) will break down PAG oil, but I wrote mineral oil. R406a should be fine in mineral oil. All the different refrigerants out there nowadays get me confused. R414b (Hotshot) will not breakdown mineral oil, but it won't mix with it either. R414b should require an oil change from mineral to AB oil. It doesn't work with PAG or POE either only AB

Sorry for the confusion.

grainboy · May 1, 2008

Ford stopped using R-12 in 1993.

tx65coupe · Feb 19, 2010

My car is running a refurbished original underdash unit with a Sanden compressor and 134a. I changed the expansion valve to one for 134 and got a new condensor. It works fine. You need to run barrier type hoses, except for the low pressure side. The old system needs to be flushed and evacuated.

AC refrigerant question.

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AC refrigerant question.

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