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I can't say definitively, as many things could potentially cause this, but here is a probable cause (found this via research, and it fixed my problem as well). The gasket for the rear door is attached to the car body with plastic anchors that push into holes in the chassis. There is also a hole in the chassis on the bottom of the door opening that a sign plate clips into. In the case my research turned up, the plastic anchors were failing to keep the gasket tight against the chassis, and water was leaking in through the anchor holes. In my case, I think it might have been through the opening for the sign plate on the bottom of the door opening. The solution in both cases was to get a tube of gasket cement, remove the gasket, apply a good bead of the cement, focusing on the anchor holes, and then replace the gasket. I also removed the sign plate, put a good bead of cement around that hole, and then replaced the sign plate. Things have been dry since then.

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Q: What causes a leak in the rear floorboard in a Lincoln town car?
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