New FSU now blows hot air,help!

[Rafael Gonzalez]

I just change the FSU last night done it before,it worked great last night.Today the AC stop working, first it blows hot air to your feet.No cold air thru the top outlets and the air cond. control panel does not work or light up is totally dead,also when you turn off the ignition switch,the air cond. blower stays on,with the key off the ignition,I unplug the FSU plug and it stops,but as soon as I presented to FSU the blower turns on.Checked fuses all ok. I want to know how can the blower keep running with the key off the ignition and no power at the control panel? .Can anyone help telling me whats wrong now with the AC system?Thanks.