I have the same problem Gil listed. This is a 2003 LXi, 3.0 l Sebring. Hot air heat blows out the passenger side but cold out the drivers side. If you switch to defrost the warm air goes to the passenger side front window and cold to the drivers side. The same happens when the air comes from the dash vents. The air directional switch and heat control switch are both cable driven. I had the car into the garage and he said it had no codes. I've tried a couple of recalibration procedures I've seen and they don't work (none were specifically for a 03 Sebring). I've read about HVAC Heater Blend Door Actuator's but I don't see this physically under the dash and it's not shown on the MOPAR drawing. I need help.

 

In that car u only have one door for both sides that's not the issue U have low coolant or a clogged heater core.

 

Your coupe was built by Mitsubishi. It has practically no parts in common with Chrysler-built sedans and convertibles. Don't waste your time researching solutions to your problem on sedans and convertibles. You might find information on a Mitsubishi forum.