Does it actually still run? Not sure what laptop model you have, but that is a big problem. Still under warranty?
Try cleaning out all the vents and running some temp monitoring software at idle and then with some stuff running. I would avoid any kind of full stress test until you can determine the cause and correct it.
Yes it still does run, this is my laptop that i use daily not sure what model it is, its a hp pavillion,will find the model when i can, i dont really think its the fan because the spot is more in the middle where the motherbord and ram is but i will try to clean out my fans, have any tips since i dont really know how and what software would u recommend me!?
If the wifi does not work and is the hotspot, I would remove the wifi adapter and insulate the ends of the power cables to the adapter well with electrical tape and use a USB wireless adapter (much cheaper than replacing a specific wifi internal adapter).