you need to take your car to ValenciaEuropean in Santa Clarita. Superior service, ridiculously good (cheap) prices. One man operation.
Anything could've happened. Depends how long you drove your car in the red zone. Ask yourself this question: Does any one of your many cooling components have more than 75,000 miles on it? If your answer is yes or "I don't know," then there's your answer. You didn't maintain your cooling system properly.
Now that you're armed with this knowledge and your motor is still good, replace all cooling components. If you get a replacement motor, still replace all components.