2000 Chrysler Concorde hearing noises in the radiator?

Everytime I drive, when I shut the car down I can
hear bubbling in the front of the car. I think it
could be from the radiator although last year
i got it checked out twice and informed it
everything looked okay. The fans kick on, im
afraid of overheating. I get regular oil checks
and keep on top of the antifreeze level. What
could it be and is it still okay to drive on a daily
basis?