OK. Here we go again. This seems like a very common problem on the early W126 cars. As mentioned, I have moisture in my trunk, (1985 380SE - which seems to be a popular car here) as well as my right rear floor panel. I KNOW that my antenna seal is bad - I have a new one, ready to install. I am going to do a search to figure out how to change it. I know water is getting in there, because it rained heavily today and when I looked, I saw beads of water down the antenna motor.

I also know that my right taillight seal is bad, because there is some water in that lens. Today, I noticed heavy condensation on the inside of the trunk lid. Also, as mentioned before, I have some rust spots on the inside of the trunk- under the window. I felt around there and felt some water.

My car is a southern car, with no rust issues, but on the lower driverside of the rear windshield, I noticed a small rust spot lurking out from under the seal.

I am thinking that this is likely one of my problems.

I am going to post some photos of these mentioned problems shortly.

Off to figure out how to change the antenna seal.....