My friend has a 2008 SX4 (just bought it) and the heater only blows ambient temperature air. Never gets warm. I have been asked to check it out for her, but need to know what to expect as I will have only a short time to work on it. Have been told it might be something to do with the blend door actuator. So where is it located, and can the blend door be manually moved until I can get parts? I appreciate any help or suggestions.