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I'm using iStat Pro Dashboard widget to get live system data of my mid-2010 27" iMac.

Under temperature readings it lists Ambient. Where the sensor is approximately located?

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up vote 1 down vote accepted

As per the manual and take apart guide provided by Apple to Apple Certified Mac Technicians: the ambient temp sensor is attached to the CPU blower (or fan).

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Thanks! I'd love to vote up your answer straight away, but do you have any sources for this? – koiyu Dec 21 '12 at 20:33
My source is the manual and take apart guide provided by apple to apple certified mac technicians. I am an ACMT. – Tony Tellez Dec 30 '12 at 3:36

I found this on iFixit below the page at Step 8 you will see the temperature sensor in orange

EDIT : that's the temperature sensor from the LCD

At Step 12 they mention the sensors but don't really highlight them.

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