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 - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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