Here's a breakdown of troubleshooting and potential fixes, but I strongly recommend consulting a repair manual specific to your year and model Freestar. This will give you diagrams and precise instructions. Improper repair can lead to further damage or safety hazards.
1. Identify the Problem:
* Door won't latch: The problem could be the latch bolt itself, the striker plate (where the bolt goes into), or the linkage connecting the handle to the latch.
* Door won't open from the outside/inside: This points to issues with the exterior or interior handle mechanism, respectively, or their linkages.
* Intermittent problems: This often suggests wiring issues (especially if power sliding) or a sticking/worn part.
2. Troubleshooting Steps:
* Check the obvious: Make sure nothing is blocking the door from latching (e.g., debris, a toy).
* Inspect the striker plate: Ensure it's securely attached to the door frame and aligned correctly with the latch bolt. It might be bent or loose.
* Test the handles: Carefully examine both the interior and exterior handles. See if they move freely and feel solid. If they feel loose or sticky, you might need to lubricate the mechanisms (use a silicone-based lubricant).
* Examine the linkage: This is often the source of problems. The linkage is a series of rods and levers that transfer motion from the handles to the latch bolt. Look for broken or bent parts, and check for proper adjustment.
* Listen for unusual noises: Grinding, clicking, or other sounds can indicate a specific faulty component.
* Check the wiring (power sliding doors): If your door is power-sliding, a faulty wire harness or motor could be the culprit. You'll need a wiring diagram to trace the circuits.
3. Potential Fixes (requiring varying levels of mechanical skill):
* Tightening loose screws: Check all screws on the handles, striker plate, and linkage.
* Lubrication: Apply a silicone-based lubricant to any moving parts to improve smooth operation.
* Replacing the striker plate: If bent or damaged, replacing it is often a relatively easy fix.
* Replacing the latch bolt: This is more involved, but sometimes necessary if the bolt itself is broken or worn.
* Replacing the handle mechanism: If a handle is broken or the internal components are damaged, replacing the whole assembly might be required.
* Repairing or replacing linkage components: This is the most challenging repair, often requiring specialized tools.
* Wiring repair/replacement (power sliding doors): This necessitates electrical knowledge and may involve replacing parts of the wiring harness.
Important Considerations:
* Safety: Never work on a vehicle without properly securing it (parking brake engaged).
* Tools: You'll need basic hand tools (screwdrivers, pliers, possibly wrenches), potentially specialized tools depending on the repair.
* Parts: Get replacement parts from a reputable auto parts supplier, ensuring they are correct for your year and model Freestar.
If you're not comfortable performing these repairs yourself, take your Freestar to a qualified mechanic. The cost of professional repair will depend on the specific issue and the labor involved.
