Flaps are probably not moving and air is going down under dash where you cannot really feel the flow. If you have VCDS you can check for fault codes. If you exercise the flaps with VCDS output testing they often work OK for a while after that. You can either change or clean the flap control motors to restore full functionality but replacements are a bit expensive and not easily accessible to remove.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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