Audi Forum - Audi Forums for the A4, S4, TT, A3, A6 and more! - Audi 2006 quttro 2.0t radiators problem

Hi everyone i am new on this audi thread.The problem i have is my car radiator problem. My radiator fan speed is going on high speed every time when i drive.I take my car to shop and they scan my engine to see if it was overheating but my car temperature was normal and cooling temperature was working good. Plus i don't have any engine check sign and my AC working good. Morning when i start my car i hear some {raddle sound from engine but it goes away after i drive for 1 min. Plus i notice now this days When i turn off my car the fan is still going about 30 sec. If any body can help that would be really helpful.
thanks
karma