* Low Battery Voltage: This is the first thing to check. Weak battery voltage can affect the power to the door motor, preventing it from functioning correctly. Start the car and try again. If it works, your battery needs attention.
* Door Motor Problems: The motor itself might be failing. It could be worn out, jammed, or have a faulty connection. This is a common issue with these doors. You might hear a clicking sound from the motor indicating it's trying to engage but failing.
* Wiring Issues: A broken wire, corroded connection, or pinched wire in the harness leading to the door motor is a frequent cause. Check the wiring near the door hinges and the sliding door tracks, looking for any signs of damage.
* Roller Problems: The rollers that allow the door to slide along the track can become worn, dirty, or damaged. If they're jammed, the motor won't be able to overcome the resistance. Inspect the rollers and clean the tracks.
* Child Safety Lock: Double-check that the child safety lock isn't engaged. This will prevent the door from opening from either the inside or outside.
* Control Module Issues: The power sliding door control module can fail. This is less common but possible.
* Vacuum System Issues (Less Likely on 2000): While later models sometimes had vacuum assistance for the doors, the 2000 Windstar likely relies primarily on electric motors. However, if there's a vacuum system involved (check your owner's manual), a leak could affect operation.
Troubleshooting Steps:
1. Check the Battery: This is the easiest and most important first step.
2. Listen Carefully: When you try to open the door, listen carefully for any unusual sounds (clicking, grinding, whirring). This can help pinpoint the problem.
3. Inspect the Wiring: Carefully examine the wiring harness running to the door motor for any damage.
4. Check the Rollers and Tracks: Clean and lubricate the rollers and sliding track. Look for any signs of damage or obstruction.
5. Manually Open the Door (if possible): See if you can manually open the door from the inside using the interior handle. If you can, the problem is likely electrical. If you can't, there could be a mechanical issue.
If you've checked these things and still can't solve the problem, you might need to consult a repair manual or take it to a mechanic specializing in automotive electrical systems. Replacing the motor or a section of wiring is often necessary for a complete repair, but often requires specialized tools and knowledge to properly diagnose.
