For this conversion to last a few years ,the system needs to be taken apart and flushed out with a solvent. Then get a rebuilt compressor, a new accumulator or dyer, orifice tube or expansion valve(depends on which system set up you have) and add proper oil and type of oil. Replace all orings. Also fix/repair leak then pull a vacuum,then pressure test with nitrogen to check for leaks and then charge system with R134a.
This system will hold about 80% R134a compared to R12. The system needs to be flushed cause the oil used in R12 reacts with oil used in R134a . Some of the older compressors will leak with the use of R134a. Its not that hard to DIY.
This is one of those things you can throw a lot of money at before you get all leaks and issues resolved ( do not ask how I know this). Go to half price books and get a AC repair manual and read and read some more. To pull a vacuum go to harbor freight and get a compressor operated vacuum device/puller. You can get gauges there too.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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