Driver side vent blows cold air when the heat is on

I have the vehicle listed above with dual heat controls. When the heat is on the driver side blows out cold air and the passenger side hot air. All vents are fully functioning. The coolant level is topped off, the thermostat is new and I just replaced the blend door actuator on the drivers side and the problem still persist. Every once and a while for a few seconds the heat will blow from the drivers side. Any help to diagnosis the problem will be appreciated.