So the heat and ac in my 97 Chevy Astro van only comes out the defroster, and the bottom of the passenger side legroom area. Nothing really comes out the vents. I know what the answer to this question is already, I think. A broken vacuum line.
Where do I locate this vacuum line? Is this something that I can do myself? I am fairly handy with tools (I changed my own alternator, do periodic maintenence myself). Is there anything else that could be causing this?