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Some of the internal plumbing pipes are wrapped in the stuff. It dries out over time and disintegrates.
 

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Most likely your vent flaps. they're metal flaps with holes in for lightness, then covered with foam that dissolves away over time. You'll probably find your flap dial doesn't work quite as it should too since air is going wherever it wants to.

Dashboard out job to fix, probably have to drain the coolant to remove the heater box, and degas/regas the AC if you have it. Fun times!
 
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