Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor

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Does this model only have a single fan?

It sounds like the fan on my Mac is going as I can hear the bearings in it grinding. I am trying to confirm (before opening the whole thing up) if this model has only a single fan in it. There appears to only be an "optical drive" fan guide on this site, but when I search online for replacement parts I get results for both an optical drive fan and a cpu fan.

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Please check your exact model as this was a transition period and the guides are not there one this model. But Everyman reports that this model is similar to the 2010 model so that guide will probably work: http://www.everymac.com/systems/apple/im...

There could be three three. Left, right and a center one behind the logic board.

Right optical drive: iMac Intel 27" EMC 2429 Optical Drive Fan Replacement

There don't seem to be guides for the other fan replacements, but you can see the left fans in this guide: iMac Intel 27" EMC 2390 Optical Drive Fan Replacement

The center fan requires the logic board to be removed.

The guide I am finding is only showing the above guide so I'm not positive because the next model does only have one:

iMac Intel 27" EMC 2546 Fan Replacement

iMac Intel 27" EMC 2429 Optical Drive Fan Image

Guide

iMac Intel 27" EMC 2429 Optical Drive Fan Replacement

Difficulty: Moderate20 - 30 minutos

iMac Intel 27" EMC 2546 Fan Image

Guide

iMac Intel 27" EMC 2546 Fan Replacement

Difficulty: Difficult1 - 2 Stunden

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Thanks. Looks like I may have to crack it open then to find out which fan may be making the noise.

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If the glass comes off with suction cups, it is the three fan model. Has the hard drive ever been changed (thermal sensors can cause run away fans).

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@mayer - It appears we lost the guides! I posted a note in Meta.

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@mayer: Still the original HDD, but I'll be upgrading to an SSD as part of this teardown.

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Have you tried running this app: TG Pro. You'll need to buy the full version to see all of the info it offers.

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