Armada starts to over heat when a/c is on and at idle or stop and go traffic. Temperature goes back down when driving again

What is your question?

Problem only occurs when a/c is on and idle. When a/c is turned on radiator fan comes on as it should. I have replaced the thermastat, engine coolant sensor and radiator cap.

What makes this problem better or worse?

Overheating comes down when driving again