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I'd agree with that. The stepper motor is a small electric motor that controls the various flaps inside the dash for the climate control (there are a few of them). Another possiblity is that it's a problem with the small nub that the stepper motor connects to, in otherwords the end of the flap itself, not the stepper motor.
What a tech needs to do is a "synchronization" procedure to see if the stepper can be made to operate properly. If not they need to investigate which stepper is making the noise and if replacing the stepper motor will fix the problem or not.
Gilly
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