After reading several similar problems others were having, I tried running the AC on high to see if it would still die down. It did not. According to the other posts, this indicated a bad controller so I bought a motor blower controller on eBay and replaced the original one. I once again have working AC. Also, if anyone's curious where the blower motor controller is located, it's under the passenger side dash at the very back. It's easier to replace this than the blower motor, but you'll still need to stand on your head to get to it.