2001 corolla - ac fan started making a LOT of rumbling noise. Even pulled car over thought it was something els. When on lowest setting (fan switch) it sounds like something is hitting fan blade. Turn it up and it vibrates loud against dash. Sounds like its going to blow up. Ac still works and feels cool. Where is fan? Is it accesible under glove box?
Sometimes stuff can get into the heater box and make noise against the fan. I once had one of those little " helicoptor" seed pods in mine and it sounded like a card in a bike spoke.
It should be accessible by taking apart that side of the dash, but I always get my Haynes manual out when I take something new apart on my Camry. They're not the best but under 20 bucks and covers the basics.