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If you suspect it could be rain water that infiltrates the cabin another approach is to sit in the driver's seat in your stocking feet when there is a good rain and wait, but dry towels around the area you eventually find wetness in if checked early enough can tell you which direction it comes from as well. Towels work with the garden hose also as long as you keeping checking them and then you have to trace back from there... I have seen drips from above wet the floor near the driver's feet/front of the footwell area which were coming from roof/gutter seam then migrating to the A-pillar/sun visor rod area, not sure that was a E-series but the idea is could be a drip that you have never witnessed, look up too! lol look for light surface rust or dried film discoloration, water that comes from outside usually leaves residue.
Thought you guys might appreciate the good news. Found the water. This is stupid. As you might have guessed.
So the water falls into the cowl. Then into a little space behind the overflow. There was a tiny corrugated wire tubing in the stream. This tubing was collecting the water as it wasn't perfecting sealed. This tubing housed the Serius XM antenna wire. It ran into the cab wall in a tiny hole. But inside the cab, the tubing was cracked before it ran back up into the head unit. The water was pouring out of that like a straw. Filling the cab.
I removed the antenna. Who listens to SeriusXM. Plugged the hole with caulk. Peeled back the mats. Tossed a heater on them then a fan. Rust Treated the small spot of rust there. And voila ! No water !!
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