Instructions
Place your Xbox 360 on a flat, level surface. Avoid blocking the console's air vents; this causes the console to improperly disperse heat and powers on the fan.
Wipe the console with a clean, dry cloth to remove dust and debris that may be blocking the air vents. Dust can clog the air vents, which can prevent air from circulating and damage the console, according to the official Xbox site.
Keep the gaming console away from heat sources. Radiators, vents and other high-powered electronics can cause your Xbox 360 to overheat and produce the whirring noise.
Install a cooling fan. Plug the cooling fan into the two empty plastic ports located on the back of your Xbox 360, and position the cooling fan behind the Xbox 360.