Pro tip: That 'simple' dryer squeak cost me a whole afternoon
It was a worn idler pulley on a 2018 Whirlpool, but the sound was coming from the opposite side of the drum. I spent 3 hours chasing the wrong noise before I actually pulled the belt off and spun everything by hand. Anyone else get totally thrown off by a sound that seems to come from somewhere else?
Read an article once about sound traveling through metal frames, totally tricking your ears. They called it acoustic shadowing or something like that. My old car had a chirp that sounded like the front passenger side, but it was just a loose belt way over on the driver's side. Felt like a fool after paying a mechanic to check the wrong wheel. Makes you not trust your own senses after that.
That acoustic shadowing term is spot on. My dad's truck had a rattle that seemed to come from the glove box for weeks. Turned out to be a single bolt loose on the exhaust manifold underneath. It really does make you second-guess simple noises.