Some company took my case mod idea. Now two 3” fans on the side with the metal casing cut out on the Power Supply Side instead of vent holes and install fans. Cool running S even if internal fan won’t ramp up. There’s always a fan speed switch you could install but will likely shorten life of fan. And if your like me. A replacement is an Amazon away. I have this and seems to help even though internal fan won’t speed up.
NexiGo Vertical Stand with Cooling Fans for Xbox Series S Console, 3 Levels Adjustable Fans Rotate Speed with Type-C Power Input, USB Charging and Data Transmission Ports, White https://www.amazon.com/dp/B0932ZSNGX/ref=cm_sw_r_cp_api_i_RHE8NYTMA78FKNBH9FAM?_encoding=UTF8&psc=1