For the past few months ive been trying to sort out my overheating problem

ghead . I have replaced
1 thermostat
2 thermo housing
3 another housing
4 hoses
5 water pump
6 my girlfriend
But finally i think i have it , i was checking for leaks an i heard a hissing noise close to the neck of the radiator , so my radiator needs replacing , do you think that the radiator could explain coolant loss