I have a Dodge Truck 1500 Laramie 2009. I have taken it to the dealer 3 times because when I drive it in a strong rain, water starts to leak into my car from the overhead dome lights and other areas get wet like floors (front and back) and under the back seats. The dealer has tested it for leaks with a hose and fan. They claim it is not the sunroof, windshield, or the cargo/break light. My truck is not drivable because the water pours in when it rain. Please help me figure out what it could be!

 

If you have installed a radio antenna on your car this must be the problem for your car.The water must be entering inside your cars body through this stuff.Tell your dealers to check out the radio antenna.

 

Do you have the sliding rear window. Maybe the water is leaking in there.

 

Very hard to diagnose not seeing the truck. Does it leak when it is sitting in the driveway or only at freeway speeds? The dealer cannot reproduce the air velocity speeds you are getting over the hood of the truck, up the windshield, and the roof. There are to possibilities. It good be getting through the top seal at the windshield or they could be a hair line crack in the sheet metal on the roof of the truck. The roof sheet metal is not a stamp fabricated piece like one would think. It is what is referred to in the auto body world as a skin. These skins are welded to a panel underneath. As the truck gains speed the sheet metal begins to expand. This expansion is basically unnoticed to the human eye but could be opening a hairline crack allowing water to go into the truck. One other question is the truck still under warranty? The first place I would start would be to remove the windshield and then reinstall it with all new fresh adhesive and seals. Hopes this helps.