IM having overheating issues, the radiator i had started splitting at the seam, so i went to the junk yard and pulled one from an 80`s monty carlo, looked exactly like the one i had, now its overheating, i put in a 180 degree thermostat and a 10 pound cap still overheated just not as quick, i guess myquestion is can a radiator go bad, or can i clean it out some how, if so what do you guys recomend? thanks,