My car has been acting strange one evening i got in my car n drove down the street in around the corner i pug some water where the engine coolant belongs since it was almost empty drove around the corner again shot back up to 280 past the 260 mark on the gauge. I replaced the thermostat twice and radiator cap. It recently started to mske ghis hissing sound in also a loud scream sound idk what it could be. Also when i stop my car and leave it sitting for maybe 5 min. Its alot of brown water like it was boiling do i need a new radiator because it shots way up and i also noticed so smoke earlier today to hrlp idk what i should do i cant keep feeling my radiator up with water to go somewhere and i dont want to drive it and something else goes wrong!!! Please help!!!