Replaced the climate control unit today and now all I get is air through the demister vent no matter what vent I try to blow air out of. I remember that the hoses are fragile and can be pulled out easily, but the only time anything could have come loose is when I disconnected the main pipe to the back of the climate unit itself. I have pulled most of the dash apart and can see a black box behind were the stereo was, it has a few coloured pipes in one side and they are all connected, so does the main pipe plug into that black box up the top?