There's an old expression that says "a picture is worth a thousand words" but I'm afraid yours are mute. I don't know what you're trying to show us in the photos because you say radiator in the text but the photos are not showing anything very close to the radiator and they certainly don't make it obvious exactly what you're referring to. That pipe is part of the hot pipe going from the turbo to the intercooler, which is in front of the radiator. If you think it may be moving, take a hold of it from inside the engine bay and see how much you can move it. There should be only very little movement at all.
Anyway, start with the obvious and check any and all bolts and attachments in the area. If you still don't find what's loose, maybe take some new photos or perhaps even a short video showing exactly what you're talking about, preferably with something pointing at the relevant part, and post it/them.