I've got a 2000 GTP with dual zone, when you turn on the A/C, the passenger side is ice cold and the drivers side is warm, not hot like the heat is on, but nowhere near as cold as the passenger's side. Anybody had this before? Looking for a common cause and repair. I would think it's either got to be the control unit itself or a air temperature blend door sticky. Any input woulfd be a great help.