Regularly look at the radiator. Give your car to work to get a bit and after that turn it off and pop open the hood. If the car is running, do not open the radiator.
https://www.youtube.com/watch?v=1aPd8ZemaIo
http://vidmax.com/video/107941-LED-Outfitters-Are-You-Currently-Having-Car-Problems-Try-These-Guidelines