[Mike Gerber]

That is the top of the radiator. Where you have circled is a common place for the radiator to crack as they get old. Hopefully you didn't do any damage to the engine when the car obviously overheated from low or no coolant in the cooling system. The engine might have been so hot that it seized and that's why it shut down. What does the mechanic now say? Has he run any tests on the car to determine if any damage was done to the engine?

Mike