My Problem
My Macbook Pro began making very loud screeching noises. It sounded as if something was rubbing against something while spinning. Looking at the picture of mac internals, I realized the noise was coming from where the fan is located. I did a hardware diagnostic test to be sure and an error code confirmed the problem was the fan. I've had the computer for 4 years, so I believe the problem was brought on by the age of the computer and dirt & dust getting caught up into it.
My Fix
I rush ordered the parts and tools which arrived promptly on time. I hadn't done anything like this and I was very nervous after reading some comments about people causing more, irreparable damage after opening up their computer. I closely followed the ifixit guide step-by-step and everything went perfectly. The hold fan was very dirty, so much so that the fan couldn't spin. Everything went smooth and the computer worked perfectly when I turned it back on, the whole process only took 20 minutes. It has been a couple weeks with no noise coming from the fan.
My Advice
Follow the guide exactly and you'll be fine. It is an easy process.
I recommend having a can of dust off or something similar to gently spray any dust and dirt out of the computer. I am planning on opening mine up again to do that because I didn't have any with me the first go around.
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