Here's a breakdown of the troubleshooting and repair process:
1. Identify the Problem:
* Power: Does the window motor make any noise (a whirring or clicking sound) when you press the switch? No noise usually indicates a power or fuse issue. A clicking sound might point to a faulty switch or a weak motor. A whirring sound without movement could indicate a broken regulator.
* Switch: Does the window work from the driver's master control? If it doesn't work from the driver's switch but *does* work from the rear passenger switch (if equipped), the problem is likely the driver's master switch. If it doesn't work from *either* switch, the problem is elsewhere in the circuit.
* Wiring: Check the wiring harness for any visible damage, breaks, or loose connections, particularly near the door hinges and the rubber boot where the wiring enters the door. These are common points of wear and tear.
2. Troubleshooting Steps:
* Check the Fuse: Consult your owner's manual to locate the fuse for the rear windows. Replace it if it's blown.
* Test the Power: Use a multimeter to check for power at the window motor connector. You should have power when the switch is activated. If not, trace the wiring back towards the switch and the fuse box.
* Test the Switch (if suspected): This is more involved and might require testing the switch's internal contacts with a multimeter. It's often easier and cheaper to just replace the switch if you suspect it's the culprit.
* Inspect the Window Regulator: This is the mechanical part that moves the window up and down. A broken regulator is a common cause of window failure. This often requires removing the door panel to access. Look for broken cables, stripped gears, or bent components. These parts are often available online or at auto parts stores.
* Inspect the Window Motor: If the regulator seems okay, the motor might be faulty. Again, access requires door panel removal. A multimeter can check the motor's resistance, but it's often simpler to just replace the motor if the regulator is fine.
3. Repair/Replacement:
* Replace the Fuse (if blown): This is the simplest repair.
* Replace the Switch: This is usually a relatively straightforward replacement, requiring some plastic trim removal.
* Repair/Replace the Regulator: This is the most complex repair. It often requires removing the door panel, carefully disconnecting the window, and replacing or repairing the regulator mechanism. Many online tutorials detail this process for similar vehicles. Expect some time commitment and possibly some specialized tools.
* Replace the Motor: Similar to replacing the regulator, this requires door panel removal and access to the motor.
4. Door Panel Removal:
This is crucial for accessing the regulator and motor. You'll need to carefully remove the interior door panel. There are usually numerous screws, clips, and possibly even some connectors to disconnect. Search YouTube for "1998 Lincoln Town Car rear door panel removal" for visual guidance. This is the most important step to understand before beginning any repairs.
Important Considerations:
* Door Panel Removal: Be extremely careful when removing the door panel to avoid damaging the clips and wiring.
* Safety: Disconnect the negative battery terminal before working on any electrical components.
* Parts: Order replacement parts (switch, regulator, motor) in advance to save time. Specify your exact year and model when ordering.
* Professional Help: If you're not comfortable working on car mechanics, consider taking it to a qualified mechanic. The cost of professional repair could be less stressful than a botched DIY repair.
By systematically working through these steps, you should be able to diagnose and repair your rear left electric window. Remember to consult a repair manual specific to your 1998 Lincoln Town Car for detailed diagrams and instructions. Online resources like YouTube tutorials are also invaluable.
