Left Fan makes noise
Left fan makes noise
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Most likely your system is very dusty and needs a good cleaning. Get a small soft paint brush and a can of can’ed air. Pop off the bottom cover and then carefully dust out the fans and logic board. Use the can’ed air to blow the mess out of the system. Don’t blow to hard or long on the fan blades.
I would recommend you get a good monitoring app like TG Pro it will allow you to see the health of the fans and review the thermal sensors within your system for issues.
If after cleaning the fan is still running ruff, you’ll need to replace it. Sadly, you didn’t tell us what your model is so we can’t give you the rest of the info ...
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How about telling us your exact model you have so we can get you the information to replace your fan.
Go to this web site and plug in your systems serial number which you can find under ‘About This Mac’ EveryMac - Lookup. Once you know paste the systems URL here for us to see.
by Dan