This was what was inside my preowned PS4 slim... my advice- loud fan, open it up. : r/playstation
Why Is My PS4 So Loud? [Solved] - Quiet Living
Sony's new PS4 Pro quietly fixes its noise problems - The Verge
PSA: When your PS4 sounds like a jet engine, and you want to clean out the dust... : r/consolerepair
Mcbazel DOBE Intelligent External Auto Temperature Control 3-Fan Cooling Fan Cooler for PS4 Slim Gaming Console [NOT for PS4 PS4 Pro]
PlayStation 4 - Very Loud Fan Noise !!! FIX — Steemit
How to Clean PS4 Slim & Fix Loud Fan Noise! How to Clean PS4 Fan on PS4 Slim & Pro!
Is your Playstation fan noise loud? Here's Why
Amazon.com: OIVO PS4 Stand Cooling Fan Station for Playstation 4/PS4 Slim/ PS4 Pro with Dual Controller EXT Port Charger Dock Station and 12 Game Slots : Video Games
How to Clean a PS4 Slim with Loud Fan - Very easy way to stop loud PS4 Slim Fan
PS4 Fan Loud: Why & How to Fix It? - Driver Easy
How to Clean Dust From a Noisy PS4 in 8 Simple Steps
How to make your PS4 quieter - fan problems and maintenance - PlayStation Universe