MacBook Pro 2014 makes constant hardware noise each few seconds

The MacBook Pro Mid-2014 I have, recently started to make a strange noise every few seconds. It's like a sequence of short "clicks". I suspect it's some hardware trying to do something and not some noise coming out of the speakers. Listen to a sample here: https://voca.ro/185RA388D2Q2

The sound roughly comes from somewhere here (but that doesn't need to mean anything specific):

And ideas? I suspect that something will break down soon and I want to mitigate any bad things happening.

Turns out the left fan doesn't work anymore and the sound apparently is the fan trying (and failing) to start every ~5 seconds. I hope this can be replaced easily by some professional.

Thanks for your help, especially @Joy Jin