IMac HD Blower Fan

Several weeks ago my iMac began making quite a bit of noise. I pulled out the hard drive and replaced it, but it made no difference. (Yes, I'm out of warranty.)
A systems monitor shows that my HD fan does not remain at a consistent speed, and I believe this is where the noise is coming from. Upon waking from sleep, there's a loud, loud sound, and I can just catch the system monitor saying the HD fan speed ramps up to ~3000. Mostly, the speed is around 1200, but intermittently the speed drops way down and the noise quiets, and then jumps up to 1400-1600, then back to around 1200.
For much of the time I had the iMac, it's been dead silent. And I'd like to return it to that state.
So. Has anyone replaced their hard drive blower fan? I cannot find any how-to online, but I have seen the part for sale in a few places.
I'm not having any other problems with the iMac, so I hope that it is only the fan itself, and not any other hardware.
Thoughts?

Ah, instructions under the 20". Seems like they'd probably be the same. Thanks!
Quite a few more steps than replacing the HD; slightly scared.
So, has anyone done this?
And can anyone lend information that would help me determine whether the symptoms I'm having are a faulty fan/blower, and not something on the board?

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Try an SMC reset, you may need to do it at least 2x.
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Shut down the computer.
Unplug the computer's power cord and all peripherals.
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Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
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I just brought my iMac 24" 2.16GHz Late 2006 back from the Apple Store today and the ODD fan is running at 4600 rpm!!! The noise it generates is way too loud. It is comparable to the wind tunnel G4 I replaced. Any thoughts on how to lower the fan speed?
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David,
Looking through my old posts to refresh my memory, my face is red as *I AM* mistaken:O
http://discussions.apple.com/thread.jspa?messageID=4064287&#4064287
I was recalling that Intel iMac users were doing the wrong SMC result three years ago (actually they were doing the SMU reset that was for the pre-Intel G-5 iMacs), and that you and I explained to them the correct way - which is of course what you recommended above:D
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Message was edited by: myhighway

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http://www.apple.com/support/imac/service/
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Elusive,
Any luck finding an answer? I have a similar problem.
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I've followed the instructions for resetting the SMC:
http://docs.info.apple.com/article.html?artnum=303446
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Hello!
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After hanging my imac - fan began to publish a crackling sound. that this could be?
few image's of istat
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See if resetting the SMC helps
Shut down the computer.
Unplug the computers power cord.
Wait fifteen seconds.
Attach the computers power cord.
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Thanks K T and Pondini.
That's really what I was looking for Ikrupp, some figures from other users under moderately intensive operations (not writing emails!).
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IMac HD Blower Fan

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