Where does the other end of this Yellow vacuum hose that starts at the AC control panel go? My ac is blowing out of defroster and I noticed other end of that hose is not connected to anything so I'm assuming and hoping that's my problem. I'm in Palm springs CA. 115 degrees out here.
Check out the following youtube video. This might be the information you are looking for. Note that the defrost vacuum damper motor has a yellow vacuum line going to it.