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There is (2) basic retrofit fittings you need. A low side fitting (blue cap and smaller) and a high side fitting (red cap and larger of the 2). If you can find them use steel fittings. They just screw on the old r12 fittings. They also come with schrader cores in them.
Before you charge the system with R134a you must vacuum the system down for about 15 to 30 minutes. It should hold a vacuum 5 minutes checking for leaks.
Start off with about 70% of the original charge R12.
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