cpu fan

Acer Nitro AN515-53, Windows 10, everything as up to date as possible. It had been making a very grating sound from the CPU fan that was slowly driving me out of my mind, so I just replaced that fan. It's still making a sound intermittently, but the noise stops sometimes if I pick up the back...

Over the last month or so my CPU fan has been making a noise I am not used to, and this occurs even when the laptop is not warm-hot and the CPU is at 0% according to task manager. I even downloaded HWInfo to check temperatures for an overheating problem, but they all read within a normal range...