I have a 1999 corvette equipped with a dual passenger climate control system. When you turn the air on, the drivers side is cool, but no matter what you do with the passenger side the air is always hot.So the passenger side climate knob does not work. In addition the mode and auto buttons do not work along with the display.Any ideas what is wrong? Where I can buy parts if I need them and how complex the repair is Thanks for any help !!!!