May have fried fans, recommendations?

Hey all, Living in Spain, riding on the metro home from work, laptop was on in my backpack, less than a year old. I didn’t realize at first, but it was running really hot. I didn’t want to take it out until I got home, and when I did the fans were going crazy. I shut the laptop down for a while, and now while it does turn back online, it is MUCH slower. Anyone know how to test system diagnostics? I’m pretty uneducated in this sort of thing.