Car overheating, ac and heat work, what are common reasons and fixes?

Evaporative emissions system failures will not cause AC and heat and overheating issues. The thoughts you've shared are all very general, and hands on testing by professionals who are skilled in testing and repair is needed. There are way too many possibilities to consider or illustrate in a forum like this. Is the air conditioning system working electrically? Low in refrigerant? You said the car is overheating -- when and what are you seeing? Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops