Right side sunroof leak, clear drains

[musthave]

Working on a 97 Land Cruiser. Same problem I have seen many times. Sunroof leak on the right side. Cleared front and rear drain and insured that water flows smoothly, but only out the right front. Rear is bone dry.

Ran my wire up several times, nothing.

Took down the headliner on the right side, this is what it looks like.

Somehow, I am still getting a major leak in the right side almost at the B pillar.

Wondering where this is coming from. Is the gasket around the sunroof just that shot?

The water is coming from the right rear just above the sliding panel it appears.

 

[Malleus]

The sunroof gasket is a dust excluder, not a water seal. Think about it: if the sunroof seal was intended to preclude water intrusion, why would there be drains?

The rear drain line may be blocked or pinched. Unfortunately, it's really hard to find that, since it has several bends in it. The first, working from the sunroof to the wheel well, is at the B pillar, the second is near the floor and the third is in the wheel well, although that's a pretty gentle bend. I'd recommend blowing compressed air in the rear drain line from the sunroof (something I don't like doing to the front drains) and see how much air volume appears at the exit point.

The reason the front drains leak is that the lower end is in the body panel pocket, which fills up with water and effectively plugs the lower end of the drain line. Extending that line through the body to exit outside of the panel permanently fixes the problem. Toyota did exactly this on the Lexus GX470. This is not the problem with the rear drain lines. The only way those drains don't work, since they properly exit the body panel before the end of the tubing, is if they are blocked or pinched. You can see the end of the tube if you look for it. It may help to find the spot where the tubing drops though the body panel from inside the cargo side panel.

Another, although unlikely, problem is the connection at the sunroof pan corner, but you'll solve that problem by pulling the tube off the nipple to blow into it. Well, at least you will when you reinstall it.

Unfortunately, neither the front nor rear tubes can fill entirely, since there's no real pressure forcing the water into them. Any blockage at the downstream end will cause the water to fill and overflow the sunroof pan (the common failure mode of the front drains), which is what is happening to you. I'd look for a plug in the far end first, if it was mine.