If your sunroof is leaking, the issue isn't about "unplugging" but rather clearing the drain tubes. Here's how you should approach it:
1. Locate the drain tubes: These are usually difficult to see directly. They're often located near the corners of the sunroof opening, hidden within the headliner and/or A-pillar trim. You'll likely need to carefully remove some interior trim to access them. Consulting a repair manual for your specific model year would be invaluable here.
2. Clear the blockage: Once you locate the tubes' exits (often near the A-pillars), try using compressed air (low pressure!) to blow out any debris. A small flexible tube or piece of wire can also be carefully used to probe and dislodge clogs. Avoid using anything too rigid or sharp, as you risk damaging the drain tubes.
3. Flush the drains (if needed): If air pressure doesn't work, you can try flushing the drains with water. Use a low-pressure stream of water to avoid forcing debris further into the system. Ideally, you'd do this from the inside, directing the water toward the drain openings, and letting gravity help flush the tubes.
4. Inspect the sunroof seal: While you're working, inspect the sunroof's rubber seal for any cracks or deterioration. A damaged seal is a common cause of leaks and needs to be replaced.
Important Considerations:
* Repair Manual: A repair manual specific to your 1992 Lincoln Mark VII is highly recommended. It will show you the exact location of the drain tubes and any other relevant information.
* Professional Help: If you're not comfortable working on your car's interior, it's best to take it to a qualified mechanic or auto detailer. Improperly removing trim can cause damage.
* Patience: Clearing clogged sunroof drains can be time-consuming and requires patience.
In short, there are no "plugs" to remove; the problem is likely clogged tubes that require cleaning. Locating and accessing them is the biggest challenge.
