2004 Pontiac Vibe Blend Door

Hello, I have a clicking noise in my 2004 pontiac vibe gt. The noise happens when the recirculation button is not pressed on the climate controls. When the recirculation button is on/pressed, the noise stops. I took glove box off and found that the noise is coming from blend door motor. When the button isnt on(unpressed) the blend door is all the way foward towards passenger. It looks loke the motor is trying to keep pushing foward even though the door is all the foward, resulting in clicking. Is there a switch thats supposed to shut off motor when door is foward, if so where and what do I need to do to fix problem. Thank you.