05 Pontiac Sunfire overheating
 

I have had mild issues with this for the last year but nothing significant. sometimes if I was sitting still for too long or slow traffic; the engine would get hot and spill some antifreeze. Now it is getting worse and overheating on a 15- minute drive.


My first step will be to change the thermostat and flush the radiator. I would love some input.


I have already replaced the coolant recovery tank and cap.