Window a/c question

For some reason, my big window a/c unit has gotten much louder in the last week. I cleaned the filter. Any ideas? 

Thanks. 


Is it definitely coming from the unit itself as opposed to some shift/movement that is now vibrating window parts?


bub said:

Is it definitely coming from the unit itself as opposed to some shift/movement that is now vibrating window parts?

 No, it's a loud blowing sound, not a mechanical rattle. 


Have you checked the filter?


If you lower the fan speed does the noise decrease? There’s a bearing in the motor that could be dried out. Sounds like a lubrication issue. It’s been a busy summer for window ac units. 



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