Car overheating problem

Ok so I have an 02 honda civic and for the past couple months my car has been overheating intermittently. When I'm driving around town it is fine but whenever I drive it for longer periods of time and I get stuck in traffic or at a red light the temperature starts to rise. I use to be able to turn my heater on and it would drop the temperature down, but now when I'm idling the heater blows cool air until I start driving again. When I'm driving my car on the highway I do not have an overheating problem it is only when I'm stopped or stuck in traffic. The heater only helps so much now. I have already changed the radiator, both engine cooling temperature sensors, the thermostat, one of the fans which was burnt out the other works fine, and I've fin combed the ac condenser. I don't know what else to do. Someone please help! What else can be the issue with this? I have changed the entire cooling system what else could there be? Could it be the heater core? Or an engine problem? Any suggestions would be greatly appreciated.

No the heater core won, t make it overheat! You left out something very important! Did you flush out the cooling system, especially the radiator? Flush out the whole cooling system and then bleed the air out so it can circulate!

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