I have just bought a 2004 Silverado and noticed that the passengers side vents in the dash are always blowing hot air. I have searched here and it appears to be the passengers side air mixture door, or something similar. I think I have found it to be in the middle of the dash near the top. And it looks as if it will require me to take the dash apart. My experience with dashes has been pretty bad, they rarely go back together without an issue and they are almost always never right after that. Does anyone have an idiot proof diagram, thread, or directions they could post up. I know my way around a vehicle, but the technical terms on the dash parts and HVAC system will likely be over my head, so pictures would be great. Thanks for any help you can give me.