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It's the aspirator fan - common problem.

 

First task is just to get to it - requires removal of the center console

Follow steps 1-5; No need to do steps 6 & 7.

(click on thumbnails for full size instructions)

 

 

Then follow the recommendations in these threads to resolve it -

 

http://www.nsxprime.com/forums/showthread.php?t=29371

&

http://www.nsxprime.com/forums/showthread.php?s=&threadid=16555