Its been raining hard in my area for 2-3 days and today I noticed a puddle of water on the floor of front passenger side. I checked under the floor mat and the carpets soaked, theres also humidity on only the right side or my windshield. I saw somewhere that it might be the sunroof drain has a clog. Anyone have experience with this? After I fix it, how should I go about drying the carpet? Im sure the insulation under is soaked too :/

 

https://www.myg37.com/forums/body-in...816-ju40d.html

 

A quick search of the forum will yield a ton of information regarding these leaks and potential methods to repair. More than likely it is the sunroof drain, however, be sure to check the cabin air filter. If the filter is wet then the windshield cowl seals have failed and water is coming in through the fresh air intake duct.

 

Question. Is there anyone here with an 09-13 G37 that has never had an issue with the Sunroof drains (two front and two rear)? Also, if one never opens the sunroof, is this still something you would still need to worry about (when I wash the car then open the sunroof after drying, the rails inside are dry)? I had a little dampness on the passenger side 3-4 years ago and it ended up being a firewall grommet that wasn't reinstalled correctly when the Amp went in. However, I have never seen moisture since. When I ask the dealer about this being an issue, they say its rare.

 

From a previous post I made back in March 2023...
Rear drain grommet issues are rare though there have been reports. More often than not any rear grommet failures would go unnoticed unless you inspected the bottom of the trunk pan. As there are no electronics to be affected, there would be no "warning" or ill-effect.

And, not to beat the dead horse into the ground, there are some things that should be addressed before they cause a issue. This, IMO, is one of them. How one tackles the issue is up to them- everyone has their own method to madness. I chose to bypass. Others did the "straw hack" while some replaced the grommet. Whatever method, just do something besides ignore it. It will fail.

Also, it is not only the sunroof drain grommet(s) that can cause water intrusion into the cabin. The firewall grommets as well as the windshield cowl seals deteriorating are becoming more common as these cars age.

 

I would say the dealer is wrong. The foam gasket will break down from age, and when it fails on the old design, it will leak through the side locking tabs. From the multitude of posts and videos online on this, I think it speaks for itself.

Other issues with it on the old design it would get clogged at the center plug or the tubing itself loosening from the plug barb.

I never used the sunroof on my G, and my drivers side unit did fail and leaked water over the dead pedal etc.

 

Do dealers ever say any failure is common on any car?

The sunroof drains are so poorly designed, I'd guess 80%+ of these cars have the issue, headed steadily to 100% as they age. This is like the heater coolant hose connector, not a matter of if, but rather when.

I have a few unprovable theories:

1. Forum members are a bit more obsessed with their cars. The average car owner can barely be bothered to check their oil, how often are they going to check their carpets for being damp?
2. Cars in the Southwest, where they rarely see rain, may never get enough water leaking in to make the leak obvious.
3. Lastly, most seem to fix this without buying new drains from Infiniti, since they are just going to fail also.

 

Nissan has changed the design of the drain many times. Changing the drain was one of the first things I had to when I got the car. Not long after I posted this another member posted a picture of an oem drain and it was a different design. It’s not hard to do,just more annoying than anything. The part isn’t expensive. I got it from z1 for like $18 bucks i think

 

Whilst I am not one to "bump" threads needlessly, I came across this technical bulletin that might prove useful to someone one day. ITB14-039b (pdf attached to this post) addresses the rear sunroof drains for the Q50 (V37). While the "newer" Q50 is a re-design from the V36 G37 Sedan, the pictures within the pdf offer some insight on where the drains are located, how to reach them, and so forth.

 

Few years ago I found a puddle of water inside the trunk(spare tire). Sometimes it's hard to notice unless you check there but smell of musty smell gave a clue something is happening there. I removed lining and I was able to gain access to drain plug. They were so dirty and clogged up. I simply washed them good and cleaned and put them back.