2002 Grand Prix Se 3.1L Great Car by owner

It's been a good car for years all services and fixes have been at the dealership where my father in law bought it, no check engine lights on or other kind of warning lights, just replaced back break pads, front are still good, tires are still good everything works except for the AC can't tell what it is but it doesn't turn on. Has a little hit on the door but it doesn't make any trouble for closing or opening the doors. Doesn't let the water in either. VINCheck pro included NO RESERVE