If your heater core wasn't leaking at the time your radiator was replaced , then ( no ) That would be two separate jobs
If you have replaced the water pump then flush the radiator with CLR also check to see if the fan is working properly.
The radiator will need to be replaced. Sometimes, it may seem that the radiator itself is leaking but it could be the radiator "hose" that is leaking. In this case, the radiator hose needs to be replaced and clamped tightly.
In general it can cost between $50 to $200 to fix a radiator in a Ford Expedition. This is based on the different causes of the radiator being broken or if it had to be replaced.
For metal radiators, ideally, it needs to be braised (not usually a do-it-yourself job). However, if there is too much metal fatigue, it must be replaced. For plastic radiator parts, ideally, the part should be replaced, and any other plastic radiator parts should be inspected for signs of impending failure since they are likely to have similar life spans.
Radiator hoses and heater hoses should be inspected yearly and replaced when neccessary.
Have you replaced the thermostat? The water in radiator should not be boiling! ------------------------------------------------------------------------------------------------------ Is your cooling fan/viscous clutch working ? (Helpfull)
Mine needed to be replaced after 10 years $$$$$
the hoses leading to and from your radiator might be clogged. If you had a rusty radiator, the rust may have clogged the hoses that carry the coolant. you should check all your hoses and even flush them out.
radiator cap
A cracked radiator can not be fixed. A cracked radiator needs to be replaced . A mechanic can replace one in a few hours.
Probably an old hose that should have been replaced. Replace the hose, clamps and the radiator cap. Inspect the other hoses. The radiator cap should release pressure in excess of psi noted on cap, usually 15 to 17 psi.