My heater was only blowing air from the defrost and the cables that hook up to the hvac controls were also disconnected so i decided i'd rip apart the dash to get everything fixed. I have found one vacuum line that is not connected. It comes from the dash through the firewall and to the engine bay but is not connected in the engine bay. I have no idea where it goes. I also have two parts to the heater that look as though there should be vacuum hoses on them but do not have any. I hope you can help me out with this. Thanks

[IMG] http://www.mustangmods.com/data/2060/tn_vacuum.jpg[/IMG]

 

The vacuum line going into the engine bay needs to connect to a manifold vacuum source.