blower motor problem
 

i have a 2004 gmc half ton. lately i have noticed when if shut the truck off and get out the blower motor is still running. none of the lights on the dash are on, the motor just keeps running. it gets worse though because sometimes it doesnt do it. so im chasing a ghost right now. just wondering if this has happen to anyone and what you did. thanks.

What speed is it on? The last spped it was set on? High ? Can you change the speed while it is still running?