quick.. i replaced my heater core.. got every thing back together with only 1 screw left lol.. but i cant get the vents to blow.. ive read everything about the vaccum lines under the hood being broken but all those are perfectly ok.. i went in through the head unit and the ac guages and found what i think is the yellow line that everyone is talking about.. it was pretty loose and when i pushed it a little.. it came out.. it connects to the back of the ac guages.. the switch that allows you to pick max ac vent floor etc... i wanna know if this is the right yellow line and where it connects too.. its not a big deal but its gonna drive me nuts!