I went ahead and put in the ES 12 after pulling a vacuum for an hour. We'll see if there are leaks. So nice to have some AC again. Now to dealing with the leak from my #1 delivery valve. I believe I need a new crush washer in there. Thanks for the advice. You folks steered me away from testing with air which was probably a chancy move.

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1985 300TD "Ted", 220,000 miles