Heater on the passenger side blows cold air?

I kept hearing a clicking on the driver’s side of car, I knew it was the actuator but didn’t worry about it. Summer and A/C worked. It was cold one morning and I tried to turn on the heater. The drivers side blew cold, and passenger side blew hot. I bought a new blend door actuator installed and it still did the same thing. Uninstalled it, ran heater for a while on high and it continued to just blow cold and hot on passenger side. Can you please provide me with some guidance? Thank you