Drivers side blows hot air but passenger side blows out cold air. on 2000 Buick Park Avenue

Actuator on passenger side is ok as it was checked. What could be the problem?

Asked by for the 2000 Buick Park Avenue
2 answers
scan hvac for codes and post so we can adv. poss d/s actuator
Have competent shop check this vehicle...it has a very COMPLEX climate control system.