My 2009 Hyundai Santa Fe is putting out hot air on the drivers side and cool air on the passenger side. I had the radiator replaced and all the fluid flushed and all new put in. They ran fluid through it in reverse also to get all the bubbles out if that was the issue. It is still happening. Any suggestions on what I should try to fix this?

 

If you get heat on one side and not on the other
Then it sounds like a blend door issue
I could be wrong?