My 1989 BMW 525i won't start was ok until my husband drove it,and it overheated. on 1990 BMW 525i

I just bought a 1989 bmw 525i. It was running fine until it died at a stop had overheated so badly, the insulation is gone off the inside of the hood. now it won't start. what could be wrong? Thank you very much

Asked by for the 1990 BMW 525i
Hi I was wondering if you ever figured out what was wrong with your car cause im having same problem and I dont have a clue what It could be