1. Blocked or Leaking Drain in the A-pillar/Windshield Area:
* Location: The A-pillar is the support post at the corner of the windshield. There are often drains at the bottom of the windshield and within the cowl (the area under the windshield wipers). These can become clogged with leaves, debris, or rust.
* How to check: Look closely at the base of the windshield, both inside and out. Inspect the cowl area (you may need a flashlight). Look for signs of rust or blockage. Try gently clearing any debris you find. If you suspect a blocked drain, you might need to use compressed air or a small flexible tool to clear it.
2. Leaking Door Seal:
* Location: The rubber seal around the driver's side door.
* How to check: Closely examine the door seal for cracks, tears, or deterioration. Spray water on the seal while someone else is inside the car observing where the water might be entering.
3. Leaking Sunroof (if equipped):
* Location: The sunroof drain tubes.
* How to check: If your Lincoln has a sunroof, check the drain tubes for clogs. These tubes are usually located in the corners of the sunroof opening. You might need to use compressed air to clear them.
4. Leaking Heater Core:
* Location: Located inside the dashboard. This is less likely to cause *only* driver's side floor wetness, but it's possible depending on the location of the leak. It's also more likely if the problem occurs when the heater is on.
* How to check: This requires more investigation and may necessitate removing parts of the dash. Look for evidence of coolant leaks (sweet-smelling liquid).
5. Damaged or Cracked Floor Pan:
* Location: The metal floor of the car itself.
* How to check: This is less common but possible, especially on an older car. Look for rust or holes in the floor pan, particularly around the seams.
6. Leaking Windshield Seal:
* Location: The seal around the windshield.
* How to check: Examine the windshield seal carefully for any gaps or cracks.
Troubleshooting Steps:
1. Timing: When does the water appear? After rain? Only when the car is parked? After washing the car? This helps narrow down the cause.
2. Visual Inspection: Thoroughly inspect all the areas mentioned above, paying close attention to the driver's side.
3. Water Test: If you can't find the source visually, try a controlled water test. Use a garden hose (carefully!) to simulate rainfall and see where the water enters the car. Have someone inside to observe.
4. Professional Help: If you can't identify the source, it's best to take your Lincoln to a mechanic experienced with older vehicles.
Remember safety first when working on your car. If you're not comfortable performing these checks yourself, seek professional help. Ignoring a water leak can lead to rust and other damage.
