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need to replace fan

Where can I buy the fan replacement?

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Why do you think you need to replace it? As to finding one iFixIt sells parts and you can google for quite a few parts suppliers. Just be careful your getting what you want (new or used).

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Once you pull off the bottom, power up the system to see if the fan was rubbing on the case bottom. The internal space between the cover and the fan unit is very tight and I've often needed to bend the cover back out. Use a straight edge to see if you have a dip in the cover near the fan unit.

If the cover was not the cause loosen the fan screws and see if it still is making noise. If that fixed it retighten and test again.

If you still have a problem and your system is dusty I would use can'ed air and a soft brush to clean things up. Giving the fan blades and cowling a good brush on both sides. Don't blow the blades too hard with the can'ed air (you can damage it). Also clean out the heat sink heat exchanger fins while your there.

Put things back together, is it still making noise? Then replace the unit.

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eBay

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My MacBook fan is making noise like its dirty or a bad bearing. It's been dropped. I am going to try and clean it otherwise replace the fan. It's the only moving part so it must be the fan.

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