All in all I'd give yourself an hour to do this. The panel removal is the most delicate part as there are a couple of fiddly ribbon cables and a temperature probe that must be disconnected/reconnected very carefully. You'll have to remove the coverglass which is attached with strong magnets (little suction cups from eBay were the route I took) as well as the display panel itself to get to the fans and other components.
SMCFANCONTROL RIGHTSIDE STUCK AT 2001 RPM FULL
It was full of dust and the cleaning alone took around 30mins. In the end, I bit the bullet and disassembled it for cleaning. When I had PCs, taking the side off the tower and giving the whole thing a good clean with compressed air was a breeze (forgive the pun) but I was worried about doing this with my all in one iMac. I tried resetting the SMC controller and followed all the advice on Apple support forums etc. I had a similar problem with my late 2009 27" iMac. And you likely have other issues within the system if you still think you need it which needs addressing not masking. So using fan over-rides just is not smart as you likely are pushing the system beyond what it was designed to do. Think of it this way a street car is not a race car and would not hold up on the race track in a race. What has happened is the gaming software outran the design of the older systems so people pushed the systems just to hard for what they where designed offer. Using any software solution you are defeating Apples design while there was some cases it made sense (heavy gaming) we have learned over time it shortens the systems lifespan and often the fan's wear out prematurely. The blade SSD used in the newer 'Thin Series' iMacs is a different subject which I also have better solutions for but lets not get distracted here. The newer (2012 onward) 21.5" iMacs use a 2.5" drive that doesn't need this adapter, A different unit is needed for the 20 and newer systems which have a 3.5" drive.
SMCFANCONTROL RIGHTSIDE STUCK AT 2001 RPM UPGRADE
Later on OWC came out with a special adapter cable which is what I use: OWC In-line Digital Thermal Sensor for iMac 2009-2010 Hard Drive Upgrade for either a HD or SSD upgrade. The trick at the beginning was to match the brand of drive the system had (i.e. I've put in quite a few HD's in these iMac systems without any problems and not using any special software!
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