Running on the thruway at 65 when with no warning a loud crack,thud and coolent smell real quick. Stopped and found the water pump shaft had broken and sent that along with the pulley banging around myengine. Now you would expect some damage wouldn't you, but what's the chance of none except for the water pump????? None!!!! Don't know why it broke in the first place, it gave no hint of failure, but I'm glad I didn't have a mechanical fan on it or it probably be a different story.