Could hear the noise and feel the chatter in the center vent in the KitchenAid french door refrigerator, looked online and finally found out it was the damper control (it took a while to find out) and then ordered the part. The replacement literally took one minute. Pop-out the center plate (the small one) which reveals two Philips screws, remove those and take out the rest of the cover (including foam insert behind), snap out and unplug the old damper unit and replace with new and re-assemble.
Don't forget to turn off the power to the refrigerator first!!