1. Track Problems:
* Dirt and debris: The most common cause. Clean the entire track thoroughly with a shop vacuum, then use a stiff brush (like a toothbrush) and degreaser to remove any stubborn grime. Pay close attention to the rollers and wheels. Reapply lubricant (silicone-based spray lubricant is recommended, NOT WD-40) to the track after cleaning.
* Bent or damaged track: Inspect the track for any bends, cracks, or damage. Bent tracks often need professional repair or replacement. Minor bends might be able to be straightened carefully with pliers, but be cautious not to damage the track further.
* Broken or worn rollers: The rollers on the door can wear down or break. Inspect them closely. Replacement rollers are available from auto parts stores or online. You'll need to remove the door to replace them.
2. Door Problems:
* Binding door: The door itself might be binding due to swelling from moisture, or damage. Check for any obstructions preventing smooth movement. You might need to adjust or lubricate the hinges.
* Loose or damaged rollers: Similar to track rollers, the rollers on the door itself can wear down. Inspect these carefully.
3. Latch and Locking Mechanism:
* Broken or misaligned latch: The latch mechanism might be broken or misaligned, preventing the door from opening or closing properly. You might need to adjust or replace the latch.
* Faulty locking mechanism: Check the locking mechanism to ensure it's not jammed or malfunctioning.
4. Cables and Mechanisms:
* Broken or frayed cables: The sliding door often utilizes cables for its operation. These cables can break or become frayed over time. You will likely need to replace these cables. This is a more advanced repair.
Troubleshooting Steps:
1. Visual Inspection: Carefully examine the entire sliding door mechanism, including the track, rollers, latch, and any cables. Look for anything obviously broken, bent, or damaged.
2. Clean the Track: Thoroughly clean the track as described above. This often solves the problem.
3. Lubricate: After cleaning, apply silicone-based lubricant to the track and rollers.
4. Check Rollers: Inspect the rollers on both the door and the track for damage or wear.
5. Test Movement: After cleaning and lubricating, test the door's movement. If it's still sticking, you'll need to investigate further.
If the problem persists after these steps, you may need:
* Repair manual: A repair manual specific to a 1993 Ford Aerostar will provide detailed instructions and diagrams. You can find these online or at auto parts stores.
* Professional help: If you're uncomfortable working on the mechanism yourself, or if you can't identify the problem, it's best to take the van to a mechanic.
Remember safety first! Always use safety glasses and work in a well-lit area when working on your vehicle. If you're not comfortable working on cars, it's always better to consult a professional.
