My blower motor doesn't work. I feel heat from the defrost part of the vent most of the time but, it snowed yesterday so I kept messing with the knobs to try to get some sort of connectivity out of the a/c. It still didn't blow anything but I noticed this morning as I drove it was blowing cold air. I stopped in a parking lot today to try to listen without my engine revving and it stopped but as soon as I started driving again I could feel it. Anyone know why this could be? How could I go about testing the blower/ AC panel? Would a continuity tester help with anything? I'm fairly sure my vacuum lines from the panel are going or are bad as well because when I try to switch my vents it hisses at me. Any help would be appreciated. I'm a new mustang owner and I am just trying to get this car figured out and in top shape.