According to Mobil Oil, it takes 2 hours to install a new radiator. The radiator does not contain any moving parts; however, when corrosion is present, it could cause the radiator to leak coolant.
Radiator leaks can be identified by the presence of green liquid underneath the vehicle. If only a small amount has leaked, then adding additional coolant suffices until a replacement radiator can be obtained. However, if there is a large amount of leakage, then the radiator needs immediate replacement.
Radiators protect the engine by cooling it down. If there is not enough coolant, then the engine could overheat.