I'm new to the forum, and new to the G37 world, so first off, hello. Second, I've searched. I have read every thread I can find on the topic and still have a couple of questions.

I recently acquired a 2008 G37S Coupe 6MT with ~40k miles on it for what I considered a steal... just under $14k cash. Then, after some recent storms, I've probably figured out why the previous owner wanted to let it go. Any time it rains my passenger floorboard gets flooded. I've done some water tests and I have pin-pointed the problem to be with the front, passenger side sunroof drain tube. All 4 tubes pass water from the sunroof trough through the tubes to the ground, but that passenger front tube also seems to find a way to dump water onto the carpet underneath the glove box (and also in a panel on the right side that contains some electronics - probably not a good place for water). I have dropped the headliner and put hose clamps on the tubes where they attach to the drains, but this didn't fix my problem. I have threaded monofilament line from the entry point, down the A-pillar, and it stops somewhere after about 3-4 ft of line is pushed through. Presumably where the hose make a sharp turn downward, is blocked, or perhaps connects to a different hose, etc... I get the same behavior on the driver's side drain hose as well; however, no leaks on that side.

Any other ideas? I'd like to snake the monofilament from the bottom side up, but I can't seem to locate exactly where the drain hole is, and I haven't gotten the car up on a lift or ramps yet. Does anyone have a picture showing me where the drain hole is? Any other thoughts? Does the drain hose go all the way from the sunroof to the bottom of the vehicle? Or does it go to some place in the middle of the car (firewall/engine bay/etc) where water is then dispersed from there?

Like I said, I am new to the Infiniti world so I don't have a lot of experience with these cars. I am, however, not a dumb@ss and can work my way through this with a few tips from you guys.

So - any help would be greatly appreciated. I'm trying to avoid a trip to the dealer, and I'm sure you can understand why.

 

Bump. I should have also said that I have blown compressed air down each drain tube. The passenger front still leaks some water into the floorboard. Please help.

 

search - there's several threads about this ... here's one about the sunroof drain tube leak with pics and part #'s ...
https://www.myg37.com/forums/build-t...ml#post3995234
"Further research on the interwebz found a plastic grommet on the firewall that carries the sunroof drain tube into the engine bay to drain near the front wheels. Either the tube comes unattached or the grommet can break. Other possibilities included an improperly replaced windshield (was original glass), AC condensation drain tube (car sat all day), or the cowl drain behind the battery (I found no standing water in there). What I read was there are 4 drains in each corner of the sunroof. Either the drain can get blocked (resulting in water overflowing into the headliner and draining down the pillar) or the drain tube can become unattached at the firewall grommet. Water was only in the front passenger footwell."


may also want to check firewall grommets - if the PO ran some wiring through them for whatever reason and did not seal them up. remove the plastic battery cover and plastic tray that surrounds it to inspect.

good luck.

 

Thanks Landshark. I actually found that thread that you linked a few minutes before you posted. I bet I have the same problem as that poster. It's probably the plug in the FW that carries the drain tube to the engine bay.

I have inspected the firewall grommet you referred to btw, and that is not my problem. It's definitely related to the drain tube. It's probably become disconnected... I'll check this weekend.

 

That was my thread. I responded to your PM.
Again, make sure you got all water out from under the carpet---there is a lot more space under there than appears obvious without pulling up the carpet.
It is likely the drain tube, given your description of symptoms. You will have to pull the glovebox out to get behind there and check.

 

Might as well replace your cabin filter while the glovebox is out!

 

Wasn't my PM as I have never sent one on here, but your thread was very informative. Pretty sure it pin-pointed my problem. Very much appreciated.

I have gotten all of the water out. Pulled the carpet, let it dry, been parked in the garage ever since. Fortunately this is a "spare car" and not my daily driver, or else I'd have been screwed.

 

Lol. I did that a couple of weeks ago because I already had the glove box out trying to find the source of where the water was coming from. This was before I had determined it was coming from the sunroof drains...

 

Well the glove box is out (again) and I have visual confirmation that my problem is the drain tube where it connects to the firewall grommet. There is a white plastic piece still attached to the tube but it is not in the FW anymore. I can't for the life of me get the SOB to go back in. I have tried using a screwdriver to push it in, and I am having a hard time getting needle nose pliers in there to grab it. Any tips? I guess you took it to the dealer so you might not have any advice for me. If I can't get it figured out soon, off to the dealer she goes. I just hate to take it for something I can clearly see is the problem.

 

Can you get a pic?

 

This picture clearly shows the tube has come loose from the firewall, but can it simply be pushed back in, or is this an indication that the FW grommet needs to be replaced?

 

I must have been in the process of posting one when you asked. lol. See if that works. It's hard to get a focused pic at the angle I was laying.

 

In my Build Thread, I have a picture of the grommet out of the car, but I'm not sure if its a broken one or the new one.

https://www.myg37.com/forums/build-t...ml#post3995234

I recall seeing another thread (I think on G35driver.com) where the guy advised to use a cable tie or similar to attach the tube. Link: G35-G37 Water leaks - probable cause and solution - G35Driver

 

Yeah, judging by your pic it looks like there are little grooves in the side of the grommet, which would concur with what I see on the fitting on the hose end. I think I'm just having a hard time getting the grooves lined up, and there is not much room to work with.

RE: the other thread. I think the guys is referring to where the tubes attach at the sunroof in. I already dropped the headliner a couple of weekends ago when I started working on this, and I put metal hose clamps on all 4 corners, so I am good there. I've only owned this car 5 weeks now, and I already know more about the insides of it than I ever intended .

I'll keep messing with this fitting and cussing at it till I either break it completely, or I get it to work.

 

He does early on, but then go to Page 2 and read. His last post seems to be the same thing you are dealing with, but it seems to be incomplete. Unfortunate.
I wish I could be more help.