Too funny, our stories are very similar, yellow car, $700. My rabbit died from a cracked block too.
Then, my second car, was an old honda accord loaded with all kinds of features, that looked and drove nice, but it also died within 24 hours. It was like 20 below zero, on a freeway, engines started sputtering and smoking, I pulled over, and open the hood, oil was spraying everywhere! Needless to say, I was ripped off as well. That is the chance you take buying a used car as is. Lesson learned.