Engine repair question about 2008 Town and Country 3.8L

K-seal works but not every leak is fixable. Worth a shot. Some you pour into rad, run it for a few minutes, pull all the plugs and let it sit overnight. My old Town and Country trans started to go so it was off to CarMax as a trade in on a 2012, we still have it. I have only changed out the water to oil cooler thingy in the valley due to some sort of leak and were on our 3rd (well almost) driver side window regulator. The replaced one in there now started making a racket so I pulled it and found the top pulley was broken, I fixed it with a screen door roller! Almost a perfect replacement pulley.