If you notice your computer making loud noises, especially when you are using it at a high capacity, you likely have something caught in your fan. These are often tiny particles that are hard to reach. You can fix this be taking itthe fan out and clearing out the particlescleaning it with compressed air or replacing it with a new fan.
Conclusion
To reassemble, complete the steps in reverse order. Make sure you fully close the back panel of the laptop before turning it on.