A/C Vent makes plastic rattling sound when cold...

Intamin

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Rattle sounds like a plastic bag in the wind, kinda. But more solid plastic than bag.

The threshold temp at which this happens varies. It seems like there's some piece of flexible plastic almost within reach of the front vents that i can grab and pull out to get rid of the sound--but of course there isn't irl, it just sounds that way. And it only makes the noise when the air is colder, not hot. Maybe some heat regulator plastic piece that opens and closes to help control temperature just a few inches in from the vents is rattling? Anyone know about this?

Thanks.

 

 
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