Car A/C making noise now somehing else in my 02 town and country

Last week my a/c was starting making a hissing sound when you turned off the a/c, then last night when I went to turn the fan speed down it did’nt do a thing… it stayed at the same speed even when you turned the whole unit off. It’s a 2002 town and country minivan with the 3.8 motor. In the old days you just changed the switch behind the radio. Is it the same thing just harder to get at?