Rain leak in passenger side "roof gutter" of 2001 LX470 (3 Viewers)

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Joined
May 14, 2020
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Location
Davis, California
Water drips out under the interior panel to the right of the glove box (if the passenger had their foot jammed hard-right under the glove box, water would drip on their foot).

Using a hose and a turkey baster, I've ruled out the drain holes on the sunroof gutters. They flow freely and drip out under the running boards.

Water can run down the passenger side of the windshield, and it goes kinda under the hood and drips out the front wheel well just fine.

If I pour water behind the front foot of the passenger-side roof-rack anchor, the water pools there (the whole roof kinda slopes forward) and soaks in, and THEN water eventually drips out under the glovebox.

However, there are a few more places along that roof "gutter" that have the same effect, and I gather that water is supposed to run in/under there, and eventually dump out along the edge of the windshield.

On the driver's side, it does just that... water absorbs behind the front foot of the roof rack and trickles down the side of the windshield, where it goes under the hood and drains out the wheel well.

This is pretty cool! Instead of those black seals on the roof making things water tight, they have a system of water flow channels under there.

But somewhere, the passenger side channel for the roof gutter isn't working correctly. Or maybe, where it flows down next to the windshield, there's a windshield seal that is leaking. However, I've tried using the hose on the edge of the windshield directly and it doesn't seem to leak. Thus, perhaps it is leaking in above the windshield corner somewhere.

I've tried calking around water entry points up there in various places, but I now realize that this is an incorrect approach, since water is supposed to flow through there, and I don't want to actually block the flow (or else it will just pool up there in the low spots).

Any advice on where to look, and what to do next?

I'm thinking of removing the hand-holds, which hold the interior trim in place, and then removing the interior trim so that I can potentially see exactly where the water is flowing. Perhaps I can caulk the specific spot from the inside.

This is a stock image that I found, but water is leaking where the red dot is shown here:

waterLeak.webp
 
Pull the trim. It's a rite of passage.
 

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