Put a new gasket on the fridge door.  It is a magnetic lock gasket found on most traditional doors.  The old gasket was horrible, and more green with mold and mildew then white.  I needed to router a 3/8 " track for the gasket and it sticks in.  New fasteners needed.  I found some vinyl glue to glue the seems, but it is not perfect.  Not sure the best way to do this.
Any ideas??? 

The gasket has great spring to it and the door will still have a locking latch that will compress it in.  I wouldn't rely on the magnetic locking properties to hold the door shut.  But it might help keep it air tight.