Ive already researched this issue and ive come up with pretty depressing findings. Figure i might as well post it. So im out drivin for 15 minutes yesterday, all of a sudden the engine temp jumps from 210 to off the scale in a span of about 30 seconds, i added more diluted fluid when i got home, checked all the hoses and the whole bit, i fire it up today to see if it happens again, about 15 minutes into the idle i check the radiator and its drained off about a quarter of what ive put into it, the temp guage reads a little past 210. I check for leaks again nothin, but i did notice something leaking out of the header collecter pipe joint, from the inside which kinda concers me anyway i cant figure out what the hell is going on and until i do dont want to drive the thing for the risk of overheating. i put in a new thermostat two days ago and drained the system right after that. any ideas?