Weird sound...
To resync the flaps press the defrost and recirculate buttons at the same time. The flap will cycle for up to 30 seconds then stop. If they keep cycling for longer than 30 sec it means they cant all sync due to a faulty stepper motor or linkage.
If you want to fix it yourself, here is some help:
http://www.buellwinkle.com/HVAC-W203.pdf
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Thanks again!
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