Why is my car overheating?

What is your question?

My 2006 Monte Carlo 3.9 LTZ just started with the overheating/engine shut down message yesterday. I had to turn the heat on in my car to shut it off. I have also noticed the fan on my car will start running after I shut it off. Would this be a plugged radiator? If so, what can be done to unplug it?

What makes this problem better or worse?

New problem

How long has your 2006 Chevrolet Monte Carlo had this problem?

Once or twice a month maybe it's rare