Date registered: May 2013
Vehicle: 1961 190SL
Location: Northern California, USA
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"My car a/c compressor says it has r12a in it.
I want to fill up as it is not cooling off (clutch is coming on).
What refrigerant can I use as I don't think r12a is available for sale"
From the questions you have posted it seems that you are willing to take on some challenging mechanical tasks involving brakes, carburetors and air conditioning. I may be wrong (I often am) but I believe that in order to service any of these systems, air conditioning for example, 2 things are required. One is an understanding of how the system works and the other is some essential tools. In the case of air conditioning you will need a couple of special tools, a vacuum pump to evacuate the system of air and water vapor and manifold gauge set to charge the system with the correct amount of the correct refrigerant.
R12 is available for sale, even on ebay, but it is expensive. Because it is expensive it is important to verify that the system is leak free or that expensive R12 will be gone soon. The manifold gauge set will check for leaks. If the system will hold a high vacuum it is leak free.
In my amateur opinion it's not wise to "tinker" with things like air conditioning and brakes. If you learn how these systems work, how to service them and get some basic tools, in the case of brakes brake spring pliers, a hydraulic cylinder hone and a flare nut wrench set, you will have the satisfaction of learning new skills and ending up with the job(s) done properly.
Also on the subject of brakes, if you can find asbestos pads/shoes it is way superior to the "organic" friction manufactured in the last 30 years. Like R12, asbestos friction is out there but you have to shake the tree. Knowledgable brake parts suppliers have sources who can reline your pads/shoes with asbestos if new asbestos pads/shoes are too scarce or unavailable.