My van leaks water when it rains cant find leak replaced windshield not roof rac on 2004 Pontiac Montana

When it rains runs down pillars both sides cant find source of leak

Asked by for the 2004 Pontiac Montana
Do you have a sun roof....drains stop up on those often.
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Mine is doing this. I looked on top and the roof is rusting at the edge where it meets the windshield. I'm thinking about putting a silicone caulk on it, but am Open to other ideas if you have any.