It seems that every year, I'm spending a substantial amount of money to replace a now very expensive R12 refrigerant in my stock 72 Pantera air conditioning system. I have corrected visible leaks but, obviously there must be others that shops cannot find. Each year the R12 refrigerent is becoming harder to find and more expensive. Shouldn't I be looking to upgrade my present system to use newer R-134 refrigerant? If so, what is involved and approximate cost. Thanks.
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