Cold air blows on drivers side, hot air on other side?

Sounds like a temperature blend door mechanism issue in the dash. Testing needs to be performed on the climate control system. This system has the ability to set different temperatures for the passenger side verses the driver's side. If there is a problem with the module function, the door motor function, or the plastic of the doors or plenum itself is fractured, the temperature will not adjust as desired. Investigate this area to find out more.