Air flow from vents while rolling but not when stopped.

[meekdog]

When I'm driving I get air flowing through the AC vents even if the heater or AC is switched off. The faster I go, the more air comes in. If I'm stopped no air comes in. If its hot ouside I get hot air. If its cold ouside the air seems to be a little warmer than the outside air. I'm sure its a flap or valve or something but I have no idea where to start without tearing everything apart to find the problem. PS, I also have constant vacuum to the tube which goes to the passenger side kick panel vent. I'm guessing thats not normal either. Thanks for any help you can give, Meekdog.