radiator crack

[seabee]

my radiator has a crack in it on the top of it bout three inches from the inlet housing on the plastic bought 5 inches long i was wondering if the palstic piece could just be replaced or if i have to replace the whole radiator any help would be appreciated

[NISTECH]

Replace the radiator, but also replace the Tstat and the radiator cap. over pressure is usually the cause of the radiator cracking.