Most likely any stop leak won't seal if its that big of a leak. It will start to clog your system and may make you run hot again. You flushed it to make it better don't put garbage back in to make it worse. As for how to fix it if you can't; all my friends would just call me. I'm not sure who you can call. my 2 cents Thanks and all my wifes friends just call her and ask her to ask me.