Our 2011 rdx is blowing heat on the passenger side only. Cool air comes out on the driver's side. Any ideas? Would like to repair myself if possible. I just replaced the driver's blend door actuator.

 

Did you check under the dash and visually see it move when you adjust the temperature?

 

Adjusting the temperature isn't the problem. The problem is we only have hot or cold air on the passenger side, not the driver's side.

 

Check the heat system for any irregularities

Blower check for worn bearings if possible

Heater core piping look for leaks if possible

 

Did you ever get to figuring out what the problem was? I'm having a similar issue I can get cold and hot from passenger side and I only can get cold but no hot from driver side any information would be helpful thanks!

 

I figured it out! Found this video on YouTube. All I had to do was unplug this bright neon green cable underneath the driver's side - on the right side around the gas pedal while the car was on and running and plug it back in low and behold I had heat again on the driver side!
If you're not too sure what I'm referring to take a look at the video on YouTube just copy the link below, it'll show the part and cable he was talking about.