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 - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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