You should have R134a, you can tell by the quick connect ports that you use to fill your AC system. the 134a use larger ports that have 2 different sizes, one of the caps will be about 5/8 of an inch in diameter and the other will be about 1/2 on in diameter. If you still have the old R12 system you will have both caps about 3/8 of an inch in diameter.
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