Yes, there are four drains and it definitely should not be draining into the trunk. I wonder of the line dislodged from the support and is pointing inside the trunk. Do you have that gap on the other side?

2002 IS300: OEM Body (ROOF PANEL & BACK WINDOW GLASS) Replacement Parts

 

Yes, there is the same size gap on the other size...how can I clear the line with air?..i see where the 2 holes are on the sunroof. Those are both clear and drains properly. How do you get to the ones on the back glass?..can you just blow air in the gap between the seal and roof?

 

Just hope it's something I can do myself.

 

And those extra 2 are for a Sportcross...Mine is a sedan

There are four drain lines on both the sedan and sportcross. Usually spraying them out with canned air or compressed air does the trick.

 

so why does it leak into the trunk when I pour water at the top left corner of the back window where the 1st picture is circled...not on the sunroof?...is the drain hose connected there?

 

I got the same problem too. I got leaks from the part u circled in the trunk. Hope you found where it coming from so I can fix it too. =(

 

Just bought the IS 3 weeks ago, but that was the first thing I noticed. Never have worked on a Lexus or Toyota, so I'm new to this. Everything else is in tip top shape. I've checked the front 2 holes in the sunroof and they drain fine..the Pass. side top right corner of the window drains down the ground properly..just the Drivers top left corner does this.

 

No, the drains are mounted and start within the sunroof housing. It almost sounds like a bad seal in your case, i was already going to suggest pouring water. These are the most common threads with trunk water. It's usually a result of moonroof drain lines, ventilators on fender stuck open, body plug, or seal. If you're pouring on a window seal then it's obviously getting inside the body panel.

 

yeah, it's not leaking inside the cabin..just into the trunk where the 2nd picture is circled. there's a tiny, tiny gap..but it's the same size gap on the Pass. side...but on the drivers side leaks into the trunk. Maybe a small dab of clear silicone in the hole will close the hole...I'd rather get it fixed instead of fix-it repaired. I know a shop will prob charge alot. How hard would it be to pull the rear window seal and install a new one? Or does the rear window have to be removed in order to do this?

 

so the leak is coming from the windshield seal? Dont understand how you pour some water onto the windshield and the water leaking into the trunk.

 

Not windshield, back window, and it would only make sense that it is the issue if he pours water right on the rear window seal and water seep it's way into the body panel. Not sure of how much it would cost to replace the seal. Try your local window replacement company.

 

Ops I meant back window haha. So to fix this problem I Ned to go to a local window replacement company and replace the seal? What if only the driver side only tho?

 

I went to a body shop and was told its a common problem for the is300's. The rear window seal will start to leak after a couple of years and needs to be replaced. I get water on the right and left sides and need to pull my drainplugs after EVERY rain or wash. What a pain in the ass. Poor design or material on the window gasket! You want it to stop replace your window gasket.

 

Researched more should I try some windshield sealant on it? Some people say the sealant stopped the leak and if it don't then I guess u Ned a new mold. Think it's a good idea to try it first?

 

In the long run i would probably replace it, but if the rest of the molding seems intact and pliable, then I'd give the sealer a shot. I haven't really looked into using that stuff like you have though.

 

yeah, that's why I thought maybe a little clear silicone in the gap may fix the issue. It doesn't do it on the Pass. side. and yeah, I've never noticed a gap like that on any other vehicle before.

 

I would just go with a new molding. The sealent will not be long term.

 

Ima give this a try when I have time to fix my leak. I always thought its some body damage that is making the leak. Now that we found out wat cause it then it's a easy fix. Any1 tried this sealant?

 

^^^^link does not work

 

It's called Permatex 81730 Flowable Silicone Windshield and Glass Sealer - 1.5 oz

 

I just put a little clear bathtub silicone at the top to get water from going down in the gap. Giving it a couple hours to dry and gonna pour a little water over it. I will post the results...And yes, this is just a temporary fix until I decided to get a new seal put in.

 

silicone trick worked. No more leak in the trunk. And you can't even tell there's anything there unless you KNOW it's there.

 

Haha good to see that it worked. Cheap fix. Lol

 

yep...seeing as I already had some laying around the house. Beats $175 for the time being.

 

Well I'm glad it stopped the leak, but i hope the water isn't pooling somewhere else now(mainly inside the quarter panel). By no means am i bashing the fix, i probably would've done the same for now, but I would get the seal replaced sooner rather than later.

 

Any updates on this? You put the silicone on the top left gap of the window, correct? I am having the same issue and cannot replace the seal at the moment.

 

can you show pictures of where you applied the silicone im also having this same issue

 

I'd be interested to know, since mine leaks right there ever since I crashed that back.

 

I'm not the only one... I haven't been able to leave a damn thing in the trunk since I bought this thing used a year ago. This is how I found out...

Here's a pic I took, jamming my cell camera up in the trunk hoping to get a better look.

One of the windshield guys at the last dealer I worked at said he could reseal and reuse the glass for $80; but I had no idea there were drain tubes back there! I caught the leak coming in and took some pics, but I never saw the tubes.

 

wow I thought I was the only one lol. Mine won't leak if I park with the front end elevated.