Regularly examine your radiator. Give your car to perform to get a bit then turn it off and pop open the hood. Will not open the radiator when the car is running.
https://www.youtube.com/watch?v=1aPd8ZemaIo
http://vidmax.com/video/107895-LED-Outfitters-Have-You-Been-Having-Car-Problems-Try-These-Pointers