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Super Moderator
2010 DTS
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88,782 Posts
There is a small intake vent for the asperator on the left side of the steering column. Could it be coming from there? Does the noise change with fan speed?
 

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Super Moderator
2010 DTS
Joined
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88,782 Posts
Hmm, my '02 has a fan somewhere in the console for the rear seat, not sure if yours does. That's about the only other posibillity I can think of.
 
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