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I am always looking at craigslist ads and along the way I have purchased both a Snap On ACT 3000 AC Recycling machine and a Snap On ACT 2500 AC Recycling machine. They both turn on when plugged in and both have very heavy canisters underneath. All of my cars have factory AC, all still working...

Hello All The 70 Dodge I have has no gas in the ac system. The shrader valve on the high side is covered with a blue cap, usually signifying R134 has been used. However, the fitting on it and the low side is still the same as was the case with R12. I have both gasses. How can I tell if the...