Air Conditioning problem
2007 Ford Mustang 4 cyl Two Wheel Drive Automatic 41000 miles
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HI I RECENTLY STARTED HEARING A KNOCKING NOISE EVRYTIME I TURN THE CAR ON.IT IS COMING FROM MY AC VENTS. IF I TURN THE SETTINGS TO JUST HIT MY FEET IT DOESNT MAKE THAT NOISE. THE WEIRD THING IS THAT THE AC WORKS REALLY WELL. I WAS TOLD IT SOUNDS LIKE THE BELT NEEDS TO BE REPLACED BUT IM NOT SURE.THANKS FOR YOUR TIME.

I would say to bring it to Ford while it's under warantee, it could be a blend door actuator, and you don't want to fix that out of warantee.