94 suburban overheating and brown water

a few months ago my truck was over heating so I keep putting in antifreeze but it kept leaking out so I tried a sealent fix and it seemed to have done the problem but I lost all heat well now it started to over heat and when i checked the over flow there is a brown water any ideas?

Stop leak is bad stuff long term. The passages through your rad are smaller than pencil lead. Stop leak bungs these up.. brown water usually means contaminants (rust, stop leak etc). If your coolant level is up and you still get a no heat condition, then your t-stat is probably stuck closed.. could be your overheating issue as well. FIX your leak, change the t-stat and flush the cooling system until clean!

Where is this leaking from? Stop leak is junk, only use that if your selling the car LOL!