回答“Why is MacBook so loud and heats up so much?”Had the same problem for 1 year. Mostly when CPU had intensive work to do. It has clearly to do with heat transfer because when I put my laptop on a cold surface the vents do not need to go wild anymore. After looking how complex it was to open the case and clean the heat sink directly I decided to try a first less invasive approach with a vacuum cleaner. Using the smallest tube, I vacuumed the vents in the rear of the laptop for 2-3 minutes. After that I did not reach 6000 rpm anymore. i would advise it as a first try before opening the case.