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That statement wasn't made around the time they change over to R134 is it ?
I remember that time when we have to switch to R134 ,they that to convert to R134 from R 12 you do have a lot off thing to do, like completely flush the system and repalce all the O ring and make sure there is no trace off R12 in the system or it my explode.
But now a day nobody does that anymore, Just recover the reminder off the R12, vacuum the system and change all the fitting(R134 fitting). Vacuum it again with R134 machine and recharge.
And you are done.
I remember I have to go to school for that BS when I want to work on the A/C
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Bud
87 930 Black R-12
86 951 Black R 134
86 944 N/A Red R 134 (part Car)
87 944 S White R 134
83 944 N/A Black R 134
83 944 N/A White Auto R 134
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