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When I turn my defroster on and then cut it off I hear a loud popping sound comming from behind the vents. Does anyone know what this is???
 

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It never did it in my other cougar and it just started doing it in this one. I've had this car for almost a year and it just started last month
 
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Yea... your vents work by a plastic valve changing positions for defrost, face, feet and combos all the noise is is that moving back and forth when you change something... if anyone knows how a guy could get in there and lube it up that would be super.
 
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