Air Conditioning problem
2001 Chrysler Town and Country 6 cyl Two Wheel Drive Automatic 130000 miles

I have a 2001 Town and Country van with a 3.8 liter engine. Recently the blower for the heat/AC started acting funny. First, it would only work sporadically, then it would run a little while and stop. Then it quit altogether. Today I started the van and the blower was running on high. No matter where I set the fan speed it stayed on high. Also, when I turned the power to the heat/ac off, the fan keeps running. It has been like this for three days. Any suggestions? I changed out the relay under the hood but that made no difference.