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?

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
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.