Regularly look at your radiator. Allow your car to run for any bit and then turn it off and pop open the hood. Do not open the radiator if the car is running.
https://www.youtube.com/watch?v=1aPd8ZemaIo
http://vidmax.com/video/107973-LED-Outfitters-Are-You-Presently-Having-Car-Problems-Try-These-Pointers