Driving around and it was really hot out. My AC is always really cold, so I decided to get it going. I put it on Max settings on all the knobs. When I turned the knob that controls where the AC goes to (everywhere, just feet, just face...etc.) it made a sound like it was releasing air, a short burst (poof), like how it usually sounds when I shut off the AC. The green light that you press in for AC turned off also at that time. Then I realized my music wasn't playing either (I had a friend with me and we were talking so I hadn't noticed that it never came on). I pressed the power button for the music and nothing. Now this really pissed me off because this happed after I'd been trying to fix my horn (which I still haven't fixed). I immediately pulled over and shut the car off. Like I said, I had been working on the horn, and that day had taken the plastic cover off of the steering column to inspect the wiring, and I had forgotten to reinstall the 3 screws holding in on. So I removed it and had a look. I wiggled some wires while I swore, and finally replaced the cover. I started the car and the AC and music came on like they're supposed to!