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Freon does not wear out. If your car is full of R12 and the AC works, leave it alone.
If your system starts to leak, then, instead of refilling with R12 you can convert to R-134A.
By the way, before long R-134A will be replaced by a new refridgerant called R-1234YF. That is really the name, I didn't make that up, lol.
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