I wouldn't waste my time and let the pro's do it. Unless you can pump down the system to see if it'll hold vacuum you're spinning your wheels.
My wife complained that her car wasn't getting cold like when new a couple years ago. Found a guy with a sale on re-charging/checking the system for $49. He had a Snap-On device that evacuated the system, pumped it down, checked for leaks and refilled that was pretty slick and non-polluting too. Car blows ice cold to this day. It is a 2013 model that had never had the system checked out before. No leaks, it just needed a refresh.
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Scott
'78 SC mit Sportomatic - Sold
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