Air conditioner starts blowing hot air on the driver side

Hello, it sounds from here like the climate control system, if set on "automatic" is misreading the temperature inside the vehicle versus what is being asked for on the controls. If the climate control system thinks it is 30 degrees inside the car, and the controls are set to 60 degrees, it will try to heat the car to 60 degrees -- even though it's hot inside the car in reality. The climate control system will choose floor and windshield areas to blow out heat, but then choose dash vents to blow out cold when the temperature is reading properly and cold air is being asked for. Now, this is just a guess, but I'd be focused on getting a diagnostic tool capable of reading "body" module components engaged so you can see what the climate control is doing and asking for. Good luck!