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Why is my MacBook fan so loud and hot?
Check your Mac’s vents aren’t blocked So if your MacBook is running loudly, try moving it to a hard, flat surface, like a table or desk. With all types of Macs, you should also make sure the vents aren’t clogged up with anything. If they are, use a brush to clean them out.
Why is my Mac fan so loud all of a sudden?
Your Mac fan may kickstart when you’re running intensive tasks or resource-heavy apps that make your Mac overheat. With MacBooks in particular, fan noise can sound as though your Mac wants to take off. By the way, in case of overheating, your Mac usually slows down.