heater problems on 1995 Mercedes-Benz S320

with auto on or any other switchs are on. i have cold air coming out on the left side and rear of car.i have heat coming out on the right side of the car.there are no codes

1 answer
You may have a problem with Control Panel or Defective Duovalve. Has and work been done to it? it is also possible if has been apart to have Connector plugs reversed on back of control panel.