confab

I thought R12 was restricted to like, NASA scientists or something.. But I was looking on Amazon and saw R12a. It is billed as a direct replacement.


Is it any good? Anyone use it?

I know the R134 is popular now, but the molecule is smaller and it can cause leaks in cases where R12 would not. (I'm told hoses can become permeable and such if they aren't tip, top perfect.)

Is there a downside to the R12a and maybe that is why I'm not hearing everyone talking about using it to replace R12?

Any help is welcome.. I'm lost on these things.

billschroeder5842

What year is your car?

If your system was designed for R12, you can use it with no issue. If your system was designed for 134, then use that.

Some systems were originally R12 and then were converted to use 134. The conversions work reasonably well, bu not as good with the R12.

confab

Mine is an 85, designed for R12, I believe.

Someone mentioned one of these replacements being highly flammable. Is this the one? Is there a downside to it? Because all I see people doing with the old systems is converting them to 134, and often at considerable expense.

Why are they doing that if R12a is a direct replacement? Anyone?

gerardvg

Hi
R12 is just R12, not sure why the "a" is there.
R134A can be used however you will need the quick connect R134A fittings so everyone will know right away what refrigerant it has, they are cheap on ebay and screw right on to the standard R12 fittings.

R134A will need barrier type hoses, try your originals first they may be ok.

Empty all the oil from your compressor, replace with ESTER oil which is for R12 to R134A conversions. Good idea to replace all the rubber O rings To the new green / blue neoprene ones unless your system does not leak.

Replace the receiver drier, evacuate the system and charge to 80% of R12 charge with R134A.

Have done my 85 more than 10 years ago, no leaks all standard apart from new hoses and neoprene o rings.
She has nice cold a/c

Patsgarage

R12a is a "drop in" replacement for R12, but IS NOT the same. It is a mix if different refrigerants (sometimes propane, hence the flammable concern) that will work in a system designed for R12. If your system just needs a top off charge of a few oz. the R12a would be OK, but if your system is "flat" and has 0 psi standing pressure I would find and repair the leaks then find a shop that can charge your system with R12.

confab

This is scaring me a little bit.

Think I'll just do the R134 after all.

confab

Thanks to all for your assistance!

The forum is a fantastic resource.