1997 Infiniti Infinity QX4 car is overheating

You're going to have to hold your computer closer to the engine so I can hear the noise and figure out where it's coming from. Actually, what you need is a live person to look under the hood first, then drive the car if that is the only time you hear the noise. If the overheating only occurs when you slow down, an inoperative radiator fan is a likely suspect. At higher speeds natural air flow through the radiator is sufficient and the fan isn't needed. If this overheating just started occurring after the radiator was replaced, it's possible the mechanic just forgot to plug the radiator fan motor in.