Klaus' service bulletin reminded me of another possible cause. A friend with an '03 model exhibited a similar flapping noise to me last winter. We thought the bearings had failed in the a/c fan motor. Turns out a blade or two of pine straw had somehow or other gotten into the vents on the cowl and all the way to the a/c fan. As the fan blades hit the pine straw, you could hear a loud clicking or flapping sound. Check for that too if you think the noise is coming from the a/c fan.
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