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Try this:
Leave the A/C at anything but 75°F either full cold or full hot..

If It do the sound = Then nope its not the Air Blend Motor.
If it doesn't do the sound = It is the Air Blend Motor.

The problem with the Air Blend Motor relies on it trying to compensate for different temps at 75°F setting it will try to either blow hot or cold and since the threshold is at 75°F it will keep trying to switch to either setting. When you leave the A/C off at either full cold or full hot the Motor wont try to switch since it will need a massive temp difference to make it cycle.
 
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