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Hi, For a while my macbook pro has been making this annoying crackling sound when the fan is on. The higher the rpm the louder the crackling gets. I’ve recently tried opening it up and cleaning the fan with compressed air but the crackling persists. Any suggestions as to what the problem is / how to fix. Thanks in advance for any help. Video of the problem: https://www.youtube.com/watch?v=4t6TQpc-

Mads Hemmingsen  sounds like a bad fan motor with some possibility of causing frequency interference. Start by replacing the fan MacBook Pro 13" Retina Display Early 2015 Fan Replacement