Hey - sorry, confused. Are you saying that that is or is not part of the problem that water is seeping through to the engine bay?

 

It the hose goes up to a hole in the firewall, but not through, and the thing connecting it to the firewall allows leakage, you'll get water on both sides of the hole in the firewall.

The hole through the firewall is covered by another piece of metal. So yes, that is why the water is going into the engine bay rather than the wheel well or ground. If you think about it, the grommets are right under the dash board, so they would inherently drain into the engine bay.

 

Thanks. Do you believe this is the cause of my wet floorbeds?

 

Yes - research has shown this to be the problem with 99%+ of the leak issues in the G cars (both G35 and G37). I'm not sure about the convertibles, since those have different leak pathways.

 

I had this same problem, But mine did it on hard rain, pouring water was not enough to make it leak. I Had both front sunroof drains leaking, bad seal on the where the drains connect to firewall. when the rubber seal goes bad on the plastic part on the fire wall it leaks inside.
If you look at your ebrake pedal assembly it should look like it has been wet. it makes it almost look like the window is leaking, but its the roof drain.
I had water slouching around after one of our Florida rainstorms, cause i was parked nose down.. if you try to fix them yourself, it is a pain in the ****. took me 4 hours to do both front parts.

 

I sealed this with heavy duty silicone around the entire seam and now water does not even drain from the bottom of the wheel well like it should be doing.... no water comes out from the under the car when I pour water down the sunroof... so now I'm thinking it's not even draining properly and it's clogged somewhere between the firewall (where I placed the new grommet) and engine wall... it's not the hose either because I already triple checked that

My last options: 1) go inside the wheel well and see if it's clogged somewhere 2) take apart the glove box again and see if I can see the problem near the electrical unit by the battery to see if it's clogged somewhere here 3) get a steel 'snake' and try to unclog anything inside the firewall hole 4) attach a longer hose to the original sunroof hose all the way down to the wheel well and drill open a hole opening for the hose 5) drill a hole in the trounce and not fix the problem but have the water drain somewhere

 

at this point, you might have to pull the dash to get eyeballs and hands back there and see what's going on.
My local LKQ crushed the 2011 I'd been pulling parts from, so I can't get photos at the moment.

 

I've been battling this same water leak for 2-3 months already. I get a leak on the passenger side floor. I took it to the dealer so they can get it checked out and fix it. They told me they change the hose and sealed it. Few weeks after I went back because the carpet were soaked, and they said there was no leak just water that was sitting on the floor from the previous leak. Almost a month later and there was heavy rain for couple of days and the car was untouched. Today I was heading out and found a pool of water sitting on the rear of my passenger seat. Before it was just the carpet that were soaked but this time it was a small pool of water. I've already spent $400 trying to get this fix and tomorrow is going to be my 3rd time taking it to the dealer for the same issue. At this point I don't even know what seems to be the problem.

Side note: I purchased the car from a Honda Dealership since they had it for a great price with only 30k miles, I've been considering taking it to an Infiniti Dealership but not sure how much that will run me for since I purchased the warranty for the car from the Honda Dealership.

 

My guess would be the rear sunroof drain hoses have broken or become detached. You should drop your headliner and see what's what.

 

Problem is- I need to get behind the firewall and not the dashboard. So I'm not sure if pulling it will matter

If the rear hose was detached, wouldn't he see water leakage through the headliner anyway and pinpoint this as the problem?

 

JohnnysG, I'm comfused. The front drain snaps into the inside of the firewall; there is another piece of metal parallel to the firewall that covers the opening on the engine side. Did you seal up the engine side of that slit? That is where the water is supposed to drain out, kind of behind the battery area then down through the engine bay.

As far as the rear footwell puddle, there are several 'berms' under the carpet that would prevent water leaking into the front area from easily getting to the back of the car, without the front being flooded too or some very abrupt G - maneuvers sloshing water around. I would suggest that the water is therefore coming from the rear. The headliner is foam-backed; it might not soak through just let water run down the backside and into the floor.

 

Yes - I sealed the engine side of this slit (the metal that is parallel to the firewall). I believe the water was seeping through this engine slit and then getting into the part where the wiring is completely covered. I saw water droplets on my wiring. I believe that this is where the problem is because the insulation would be soaked at the bottom

I think my last option is to just attach a longer hose to my current sunroof hose and run it through into the firewall all the way down to the wheel well

 

You need to isolate the issue. Start with sealing the roof.
Plastic sheeting throughout the roof and try to bathe the entire car as hard as possible. The outcome of this test will isolate if it's a roof problem or firewall.

It's a good idea to grease up any grommets by the firewall then move to the roof.

 

I should post an update on my situation. About 7 months ago I ended up silicon sealing the entire sunroof, using some all weather, heavy-duty clear silicon. So far, no leaks.

I could've saved ~$2k if I just had gone this route from the start, but you live and you learn.

I don't have any intention of actually fixing the drain tubes. I hate sunroofs and I won't ever get rid of the car.

 

Hey guys sorry to bring up an old water thread. I wanted to share my issue with water on my driver side floor! A couple days ago it rained pretty hard here in Chicago. I noticed a humid smell coming from my car. I decided to remove carpet and what do you know!? Water! And lots of it. After doing extensive research. I found decided to check sunroof drain plugs. They seemed fine. I ended up popping out the small grommet that leads to the drain tube clean it out and installed a .25 inch tube for better water flow. I then put everything back and called it a day. A few days later, more rain. And more water!! I was getting ready to take it in to the dealer to figure it out. Then I read about a rubber grommet that holds wires on the firewall. So a few months back I got the illuminated Emblem installed on my grill. I followed the wire and guess where it went through? The grommet on the firewall! It was popped out about 50 percent. I popped it back in. I’ll be back with an update for water!

There you can see the wire running through the grommet.