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I know that this question has been asked a hundred times,but I still don't know the right answer.I,m planing to convert the a/c in my 81 633 to the new R134 refridgerant.Which,if any, of the a/c components to I have to replace?If the compressor has to be replaced what would be a good unit to use?Also,after I recharge the system with the R134 what,s the best way to check for leaks? Thanks for your help. Fred