Ok, my A/C is stuck on the defrost mode and will not switch over. Everyone and his brother has told me its a vacuum line. There is a small, hard plastic line that is tapped off the master cylinder. This line was broken when I was removing the cylinder heads. When it broke I heard a hissing sound (air escaping). The problem is, I have no idea where the line terminates. Does it terminate on the intake somewhere? Its driving my wife nuts since its getting rather hot now! [:@]Any ideas? Possibly a link to a vacuum line routing diagram on-line?