It seems like the bolt in the passenger side block is the lowest point in the system. The picture should show some water sitting in there. That was because the plug there in the back was blocked by small flakes. It happened twice as I'd add the distilled water/vinegar through the pump spot and plastic bits. Seems to flow pretty clean now.
Now that I'm satisfied that most chunks seem cleared. I'm debating doing the vinegar cycle at all. I've also found sources that say "Water Wetter" helps with rust so I'll put that in with the final coolant mix.
Still accepting suggestions. I have a feeling my coolant may just be rust colored from now on.
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