2002 v70 xc
 

Can anyone help diagnose what is wrong with my A/C?
when I unlock the door and get inside the car I hear a noise ( like a fan) behind the A/C control unit this stays on untill I lock the car again.
Twice I heard the blower turns on itself while the car was parked and locked and the A/C Unit was turned off.
could this be an electrical issue?