Loud, rapid clicking noise behind glove box!
 

Recently bought a used 2004 Mazda MPV-ES with 143k miles. Great ride and has been impeccably maintained by the 2 previous owners.
Recently "something" behind the glove box began making a loud, rapid clicking noise while the ignition is on and it only stops when I unplug the sensor connection attached to a plastic gray/white "box".

Trying to figure out WHAT the "box" is WHY it's making this noise?? Here's the sticker on it.
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https://cimg6.ibsrv.net/gimg/www.maz...c03570cf34.jpg
https://cimg7.ibsrv.net/gimg/www.maz...d61bda4669.jpg
Parts label on the "plastic box"

Looks like the fresh air / recirculated air flap actuator.