Added about 40 oz. of R-134 to get the a/c going again now that we have emerged from the deep freeze. The rear unit had the rhythmic hissing sound, but that is gone now too. I imagine I have a significant leak that will need attention this year unless the stop leak does its job.
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What I've heard from a/c shops is not to use that stop leak because it doesn't really work and the a/c shops don't want to work on systems with that crap in it. It's better to just have them diagnose and even just fix it. Sometimes they can go overkill on the replacement recommendations though.