So i have 05 saab 9-3 just put in a new blower motor resistor, worked fine.. then it would keep running with the car off and then it stopped working. What could be the issue?

Hey all, wondering if someone can help. Having AC problems for my 2003 saab arc. a few months back i had that infamous ac problem where my saab's ac would not turn off (ACC). When the car ran it just blew warm air at 1 speed. Even when the car was shut off, it blower would run. I got this...