Chevrolet 1999 Express Van Owner's Manual page 80

To open the "60" (front) portion of a 60/40 door from
the inside, pull the handle toward you and push open
the door.
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To open the "40" (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 side doors, close the "40" (rear) door first.
Then close the "60" (front) door. Check to make sure
both doors are completely closed.
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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 outward at the spring hole
and then open the door. When you close the door, the
check strap will automatically re
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engage.