When I connect my Macbook Air to the thunderbolt display the fans run constantly

I dont understand.... but the fans seem to run at full speed the entire time I'm connected to the the thunderbolt display.
My cpu usage is blow 10% and and the cpu temp from istat is showng as 72
I understand the fans kicking in once in a while but these run for hours and hours at full speed (6496 rpm)
Anyone else having this problem?

I have the same issue. I've had the MBA for a couple months now and haven't had the fan kick up hardly at all. A few minutes after it's connnected to my new T'bolt display though it kicks in and stays on. I've updated firmware once but there may be others and it hasn't helped.
Mine is in the closed position in a Book Arc and I've only got Chrome open for browsing so far.

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