The sliding door track and guides may become worn causing the sliding door to come off track.Google+
Car Problem Reports
Chevrolet Lumina APV Sliding door track and guides may become worn
Chevrolet Lumina APV Problem
Average Mileage: 117,000 mi (100,000 mi - 134,000 mi)
Visitor, 1994 Chevrolet Lumina APV, 100,000 mi
Sliding door is hard to close when it has been opened all the way.