How do you change a radiator 1997 gmc?

Unbolt and remove the top cover, or metal shroud. This will give you access to the radiator. Remove the rad. hoses and trans. lines. Unplug and/or remove the two fans ( I left them on the radiator when I removed the radiator) then unbolt the radiator and lift out of the car. It will be somewhat heavy if you do not have the fluids drained from it.

I assume you need to get the tanks repaired due to leaking.