why is my car still overheating after $800 new radiator/engine tests?

What is your question?

I've taken the car to the repair shop 3 times AFTER new radiator.thrmostat, hoses and leaks repair. THEN, they did an engine test to see if that was the cause but shows no leaks, no engine issues. I've spent a fortune yet radiator stays bone dry, but coolant is up to full level.It's still overheating. I'm out of money and options. Can you help?