There are a couple things that could cause this but since you found things in the blower motor, I suspect you have more in the ducts of the system.
https://www.2carpros.com/articles/low-or-no-air-flow-from-vents
Basically, we need to remove the blower motor and use a flexible tube and see if there is anything obstructing the vents.
Please see the info below on how to remove the blower. Let's run through this info and let me know what you find.
Thanks
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Friday, January 14th, 2022 AT 4:49 PM