I think I'd tend to agree with you, try removing the motor and frring it of with some electrical contact cleaner and manual manipulation, failing that it's a new motor try VAGparts.com for a better than stealer price.
You won't need to rip out all the dash, the recirc unit sits ontop of the motor which is easily accessed by removing the glove box, I would suspect it isn't that though, more like the flap to the central fascia vents.
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