A free 91 240SX! needs a radiator

I don't know about that particular model, but most radiators can be removed in less than 5 minutes and are held in place with about 4 bolts only !

The main rubber hoses, usually one upper and one lower, need to be undone, then re-fastened, and sometimes the clips securing them can get seized and slow down the task (this is not common though). Some models of Nissan radiator are an utter bastard to get at, those clips. This can depend on whoever installed them in the first place, whether they had the foresight to align the screw-heads facing the most accessable direction

If these rubber hoses are in poor condition, then it is sensible to replace them with new ones at the time. Can save a roadside overheating, breakdown and tow ! If these hoses are in good condition, then re-use of them is plenty ok

Remember to bring plenty of new antifreeze/anticorrosion coolant, as suitable for your region where you live.

Most of the old coolant/water will get spilled when doing the job, so might as well replace it anyway

Some models of car (dunno which ones) require a specific re-filling/bleeding air procedure, to ensure that the coolant is entirely filled and air pockets are not left in the system.

HTH

Free??

AHAHAHAH

All you need is a box of condoms and a prenuptial agreement.