p;You don’t have to worry too much, fan is controlled by system itself. If you run some applications which don’t occupy much system resource, system would auto close the fan to save certain power. And when you run some applications charging much to CPU, fan would auto start and continually spread heat for CPU. Then system could keep normal running. This is the entire running enginery of the laptop. If fan fails, then system could not continue. It would auto shut down. There’re many cases for fan failure, such as: there’s much dust covering on the fan module, which stops normal thermal. Besides, the fan itself has some defaults on its function design, when there’s no good thermal performance, such problem would appear. Generally speaking, except system would auto control fan, you can also use other application to control your fan. Now there are many out there to control fan, you can even set a time and a speed to customize your fan. You can also set it continually run in low speed, or continually rotate in high speed. Then you can let your system stay a good running state. Hope this could help you!