So i am working on my interior and i unpluged my vaccum lines and for some reason after i reconnected everything my heat or air is not coming out. When i turn the air on i can hear the vaccum lines sucking in or wahtever they do but no air is coming out. Then the weirdest thing when i get going up to say 60 my air will come out in like half blast. But when i slow down the air dies again. What is going on does ne one know how to fix that