r-12 is no longer produced in the united states, it can still be bought but its as expensive as liquid gold
i retrofitted my ac to r134 myself and it was ice cold. i did it because my system was completeley discharged because the schrader valve on the accumulator failed and discharged the whole system.
id reccomend replacing the accumulator tho some r-12 ones have parts in them that work with r-12 lubricants only and its a cheap part for our bonnie at autozone and easy to replace and u get new orings for it too which also kills another bird with one stone
where exactly are you located in wi (i was in wi on sunday twice
), next time im up there i could do it for ya, just get the kit, and youll be set