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crwdns2944351:0crwdnd2944351:0iMac Intel 21.5" Retina 4K Display (2017) Fan Replacementcrwdnd2944351:0crwdne2944351:0

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Introduction
If the fan in your 21.5" Retina 4K 2017 iMac (EMC 3069) is faulty, failing, or badly clogged with dust, use this guide to replace it and return your iMac to cool and quiet operation.
Some images in this guide use a 2015 iMac, which has minor visual differences. These differences do not affect the repair procedure.
Opening this device requires cutting through adhesive that will need to be [https://www.ifixit.com/Guide/iMac+Intel+21.5-Inch+Retina+4K+Display+%282017%29+Adhesive+Strips+Replacement/96196|new_window=true|reapplied] after you finish the repair. Be sure to test your new parts before sealing the iMac with the adhesive strips.