I have a 99 Deville Concours and when driving with any window open after it rains I hear a gurgling noise coming from the passenger side windshield post. The headliner gets damp (not soaked) on that side from the front seat all the way to the back. The noise goes away after 30 minutes or so. The leak does not appear to be coming from the sunroof but I could be wrong.
The hoses for your sun roof run down the front pillars. You may have clogs in the rear hoses that go down into the trunk area and when you move and stop the water rushes to the front hoses and run down. Gurgling is a good noise that the hoses are moving water. I would have all your hoses checked and flushed. The back hoses are most likely cloged or damaged.
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Thanks, I will check the hoses
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