Two steps forward and a giant leap backwards.

Do not use tap water, 1st choice is reverse osmosis, 2nd distilled. It matters. I buy premix, unless I can't. Get old style green antifreeze, not the new stuff, it matters too.
Before I knew this, I used GM orange, I had several leaks around my engine. That's when I found out that GM had an issue with it in the beginning.
I had to do a flush, got things under control now after going back to green and using the proper water.
If there are any doubting Thomas's out there, do your home work, check it out.