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help with refilling ac system.

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    wesley pyburn
    wesley
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    i have a 1989 gmc r3500 with a 454.my ac line started to leaked and it leaked out all the r12.i was wanting to know whats the proper way to change it to r134a?do i just need to get the port adapters and fill it with 80 perfect r134a and add the new pag oil or will the old r12 oil need to be drained?

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