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Modelo A1311 / Mediados de 2011 / Procesador Core i5 de 2.5 y 2.7 GHz o Core i7 de 2.8 GHz

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Loud fan, hot top left edge

I have an iMac 21.5" from mid 2011 that I don't quite know what to do with.

On startup, and initial boot, it's fine. After a while though, a loud fan-like noise occurs. Given enough time, the top-left of the iMac near the ventilation strip gets hot to the touch. It seems to be coming from close to the top of the iMac, so I thought it was the hard drive. I replaced it, thinking that might be the solution. (it wasn't but it can now run MacOS Sierra reasonably well, so I'm pleased with that)

I took a closer look, hoping to diagnose it further. I installed iStat on the iMac, and it showed that all internal temperatures were hovering between 97-148 degreed Fahrenheit. At this point, the fan(s) was (were) running quite loudly.

I poked around a bit on the interwebs, and came up with two possible solutions:

-Add a Digital Thermal Sensor

-Replace the CPU fan

Just looking for some feedback as to which course of action might be preferable. If more info is needed, let me know.

Thanks in advance.

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Did you or anyone change the hard drive? If so, you diagnosed correctly and you need that thermal sensor from OWC.

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It's a computer from the organisation I work at. I just replaced the hard drive today, but I see signs of it having been opened before. (this is my first month here) So my predecessor may have done some work as well.

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@gryczewski - Alek - You should see this on the drives SATA cable: OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade if you put in a non-Apple HD in.

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So that part should be on there already?-- EDIT: Misread you, nevermind, thanks for the help :D

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Alek Gryczewski estará eternamente agradecido.
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