Chosen Solution
I had a bug fly into the connecting part where the screen connects to the keyboard (the black bar) i don’t know if it flew out or can fly into my battery and fan areas. I don’t know how to clean it or if it is a bad thing, what is that black bar? does it go into my computer system? HELP?
I’ve seen much worse. Open it up and disconnect the battery and see if you can spot it. The fans probably got it, so remove them and clean the vents: MacBook Air Models A1237 and A1304 Fan Replacement