So it looks like my AC is working, but when it is on my vents still blow out hot air. I am guessing it is related to whatever mechanisms happen behind the vents to direct air from the heater core to the evaporator. I tried to do some searching here but I'm a little lost as to what the possible problems could be and how to troubleshoot it. I read a few things about a vacuum line, but beyond that I'm a little lost. Any help would be appreciated, thanks!