The cooling fan on my Xbox one s is running very loud and I smell something burning.
I googled your inquiry and found this in Xbox support - https://support.xbox.com/en-US/help/hardware-network/warranty-service/getting-your-product-serviced. the cost to replace the fan is listed as $179 US . The fan costs $5 in real life. if you have
a can of compressed air, you can try cleaning the machine with short bursts of air(powered off!) or you can try this link to a description and video of how to replace it yourself. https://www.youtube.com/watch?v=UEeEchJhgCQ. I would try a local repair
shop[ first, which "should " charge a more reasonable fee for a pre-diagnosed problem. good luck.