GMC 2004 Savana Van Owner's Manual page 100

To open the front portion of a 60/40 door from the
inside, pull the handle toward you and push open
the door.
2-14
To open the rear portion of a 60/40 door from the
outside, pull the handle on the side of the rear door and
pull it toward you.
To close the 60/40 side doors, close the rear door first.
Then close the front door. Check to make sure that
both doors are completely closed.
The front side swing-out door has a check strap
assembly in the door frame to keep the door from
opening beyond 90 degrees.
To open the door beyond 90 degrees, close the door
partially, pull the check strap toward you and then open
the door. When you close the door, the check strap
will automatically re-engage.