Install some new hoses top and bottom. Fill the radiator up with the appropriate coolant (green) and mixture for your climate. I’m in Florida and the coldest we get is 30-40 degrees. So I just use off the shelf premixed coolant. Once you fill the coolant to the top of the radiator keep going, it will settle and look full but it’s only kinda full. When it spurts back up your funnel it’s full…ALMOST.