GMC 1998 Savana Van Owner's Manual page 86

Rear Doors
To open the rear doors from the outside, open the
passenger side rear door first. Pull the handle toward
you to open the door.
To open the driver side rear door, pull the latch release
lever at the inside edge of the door.
Both rear doors can be opened past 90 degrees by
opening the doors past the first detent (90 degrees open),
then opening fully.
To close the rear doors, close the driver side rear door
first. Then, close the passenger side rear door. Check to
make sure both doors are completely closed.
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