2011 imac 27" 32GB - final stage of 1TB + 2TB SSD upgrade (replaced HDD & optic drive). Also cleaned out the fans and case. Running 'SSD Fan Control' & 'Macs Fan
Amazon.com: Odyson - Cooling Fan Replacement for Apple iMac 27" A1419 (Late 2012-Mid 2017) : Electronics
Replacement Hard Drive Fan 069-3744 Cooling Fan For Apple iMac 27" (A1312) 2009 | eBay
iMac 27" 2017 Fan Replacement - iFixit Repair Guide
iMac Intel 27" (Late 2012-Late 2015) Fan - iFixit Store
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Amazon.com: Odyson - Cooling Fan Replacement for Apple iMac 27" A1419 (Late 2012-Mid 2017) : Electronics
CPU fan iMac 27 repair - Free guide - SOSav
How To Replace the Fan in a 27” iMac (Late 2012) - YouTube
Install SSD iMac 2011 - How-To DIY Guide Tutorial
For Apple Imac 27''inch A1419 Cpu 610-0145 Laptop Cooling Fan - Fans & Cooling - AliExpress
2010 iMac 27" - replace optical drive with slot fan to quietly lower temps? | tonymacx86.com
hardware - Where to source replacement internal fans? (For a mid-2011 iMac) - Ask Different
How I Fixed: Mid-2011 iMac Fans Running At Full Speed - Randy The Tech Professor
iMac 27-inch 5K, Mid 2017, Fan Replacement, Apple 923-01679