Thread: How much to convert "old" ac system to the new stuff???

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Good suggestion Pope. Duracool is not available in a lot of markets. Max-Cool is the same stuff and might be more prevalant in other markets, Fridge-cool comes to mind also. I like this line of thinking because if the person doing the conversion is not experienced, It is a pndora's box of nightmares not for the faint of heart. Mineral oil will coagulate upon contact of the PAG or Esther oils therefore the complete flush must be complete or this is going to be a repeated process with servicable parts being replaced a few times and flushing repeats, etc. Don't forget to replace all o-rings with the "green" 134 rings. 134 has a more gaseous expandible rate and is harder to compress to the state of R-12. This leads to some systems not being as efficient in the cooling department at the evaporator.