I was having the same problem on my toshiba satellite laptop after the win 10 anniversary update.
Toshiba satellite laptop fan noise.
Toshiba satellite ultrabook u940.
I was having that problem also.
I m sure one is available to purchase.
Try one of these guides to see if one is similar to your toshiba.
This particular model is a toshiba satellite.
Also checkout this forum on loud toshiba fans.
First see if anything is using a lot of cpu via task manager.
It will help you to get to the fan.
If the fan is making a lot of noise but it only sounnds like it is working hard you can try three things.
After taking the back off there are screws hidden beneath the pads closest to the hinge i figured out that although the fan was clean it would sometimes hit against the fan housing when it spun at certain speeds.
Instead of a gentle whir it was really loud.
To make the fan quieter first try cleaning off any dust or grime to make sure that the fan can run easily.
In this video brandon show the viewers how to open up a laptop and clean a dusty not working fan.
This will over work your cpu and thus your fans.
Your toshiba laptop uses a cooling fan to prevent the laptop from overheating but the fan can be noisy.
This video was uploaded from an android phone.
If the fan is still too loud you can change the fan speed using the bios basic input output system menu.
To make the fan quieter first try cleaning off any dust or grime to make sure that the fan can run easily.
I have a toshiba satelite that s a few years old.