My 2003 has a heater/AC issue, no matter what thetri-zone settings are set at the passenger side and the center console only put out heat. I am guessing it could be a heater/water control valve but don't know where it is or it could be whatever control module controls the heaters. I am guessing a control module as the passenger side and center console both are kicking out heat, and the center console should put out the same air that the rear roof vents instead of dumping max heat.