I didn’t think my MacBook had a fan - until I left it recharging in a bedside drawer on that hot night 2 days ago. In the morning I could plainly hear it buzzing and it was very hot and would not power up. I stood it against a cold radiator and after a couple of hours it was ok, but a lesson learned
Also there are many apps that might prevent a laptop from overheating, like CPU Cooling Master, for example, and many others. They can be easily found on any of the torrent sites. You can take a look at Legaltorrents.com, there's a whole list.