I think the fridge pump is fine. I made one about 25 years ago and it worked fine. I plan to do it again soon. If it creates a vacuum which brings the system below the vapor pressure of water at that temp, it should remove the moisture and the vast majority of non-condensible gases. It's ugly, but so what?

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.