About "Tiny Cooling Fan" noise problem in the cooling fan use is a commonplace problem. If it is found in the use of the AC fan noise is too large, to check the bolts to see if loose. Also check the AC fan impeller is not loose, "Tiny Cooling Fan" noise and leaves a lot of time are inextricably linked to this, so once the cooling fan noise, many users will think to check the AC fans The impeller section. Cooling fan bearing vibration is running common failure, vibration "Tiny Cooling Fan" will cause bearing and blade damage, loose bolts, damaged housing duct failure, seriously endanger the safe operation of the fan. Cooling fan bearing vibration causes more excessive, and if they can analyze the reasons for taking the appropriate approach for different phenomena, often play a multiplier effect.