Hi
If you've been in device manager and it indicates the fan "devices" are working correctly then i'd suggest getting a program like open hardware monitor.
More modern laptops have a tendency to be a bit lax in running fans sometimes they just don't need to.
The monitor will show you fan speeds and the temperatures for the important bits in your computer, armed with that information you can check and see if anything is getting dangerously hot and if maybe your fan is spinning just not very much.
It's a good starting point before opening it or messing with drivers.