If you have to remove line, the heat is good - then soak with Liquid Wrench (etc.) There is non-flammable to choose, and, for sure a proper flare-nut wrench. The cyl. attaching bolts are 1/4" and need 7/16" socket setup. Again can be soaked and, if going this route, buff all threads and use some anti-seize compound. Hopefully the bleeder will remove also. :)
