Hello,

I need to update my sig as I just sadly sold my 76 300D but I had the same problem as you when I first got the car. I thought it was comming from a door seal as well (rear passenger pool on floor) and tried covering the door as well to no avail. Who ever had the car before me parked it under a pin tree for what must have been forever. The gutters were completely clogged not to mention seals etc. Also for some reason teh gutter was smashed in on the passenger side. I took the spray nozzel on the hose and sprayed in there and all around the car for about 30 mins until all of the crap that was in there stopped comming out (handfulls).

After that I did not have a leak any more. As to the question of why (I couldn't tell you (rusted out...I doubt it as there is no rust on what used to be my car) I'm assuming there is some sort of seam just below that on the body trim that is held on similarily to the other trim peices and since it sits and polls in a clogged gutter it has time to seep into those connectors and down into the floor pan.

Take a look if it is clogged clean it. If it is not clogged clean it anyway. I did mine again with more riggor a few weeks after that and got even more junk that had accumlated in small orfices near the bottom that I had not gotten before.

I hope this helps you as well and ejoy your car. I regretted selling my car before I even did it. I've made it through the denial stage (drank straight past the anger stange and am somwhere between depression and acceptance right now

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76 300D 130K "Stella" (Sold )
74 240D 299K (Donated to Highschool For Senior Project WVO)
83 300TDT 290K (My one and only)
Sanford, NC