Shawnster, are there any cracks around the drain near the hood springs? Or in to the firewall?
I had another go at fixing our leak, and I had some success (though there is still a slight leak). The area right underneath the hood spring (where the drain is) was cracked along the seams (both back towards the cabin and towards the side of the car). I was going to try JB Weld but it is an impossible spot to get at. A syringe might have worked but I didn't have one. You have to have pretty small hands, and even then it's difficult. If your hand is in there, then you can't see what you're doing. Anyway, I couldn't get in there even to clean so I took an electric toothbrush (not mine
) and moved the dirt farther back so I could vaccum it. Then I put a sock (not mine
) over my hand and washed it with some solvent. Once it was dry I started covering the cracks with that metal repair tape. Hubby calls it candy wrapper, but I love that stuff! It sealed up a problem in our 280 very well. It was really difficult as I couldn't see what I was doing, but you can layer that stuff so I just kept at it and eventually I got it all covered. It was definitely leaking in to the cabin there, as covering it has improved things immensely. There is also a leak at the firewall around the cable line that leads to the hood release. I tried to cover that too, but this isn't a good method for that as the area is several depths. So, it looks like we're still having to take the emerg brake off and try to repair that area from the inside.
Anyway, check it out. Both Belinda and our parts car are rusted in these areas, so maybe it's a weak point (the parts car is REALLY bad).
Good luck!