https://www.youtube.com/watch?v=46paTVC8GUw
Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/134/U/ac-and-heater-controls If you're experiencing trouble with your car's heat, whether it's not working on one side or not responding to commands, or you hear a clicking noise coming from behind the dash, it could be a blend door actuator or a blend door itself. In this video, Andy shows you how to diagnose and troubleshoot common car and truck heating problems. He'll take you through the process of locating the blend door actuator, which is attached to the heater box and located underneath the dash, and show you how to replace it. He'll also show you how to check for problems with the blend door itself, which can cause a clicking noise.