My car is getting a little to hot and starting to overheat what should I replace first

What is your question?

The needle on the gauge is starting to go over the line for getting hot but the air conditioning works and the heater works there's no circulation in the reservoir tank what's the problem

What makes this problem better or worse?

Stop driving it

How long has your 2005 Chevrolet Malibu had this problem?

4 months