Ignition Key Switch ?

Hi everyone.Just to let you know I am no mechanic so this may sound like a dumb question.I hava a 1993 Cav. and when I turn the car off the fan for the ac continues to run.This started about 2 weeks ago and now my alternater makes a buzzing sound (when car is not running) and runs down the battery.Could this have something to do with the key switch or am I looking in the wrong direction.If anyone has any suggestions it would be appreciated.thanks,
Keithmc

Hi everyone.Just to let you know I am no mechanic so this may sound like a dumb question.I hava a 1993 Cav. and when I turn the car off the fan for the ac continues to run.This started about 2 weeks ago and now my alternater makes a buzzing sound (when car is not running) and runs down the battery.Could this have something to do with the key switch or am I looking in the wrong direction.If anyone has any suggestions it would be appreciated.thanks,
Keithmc

Thats fucked up man. I think your looking in the right direction.