I have a minor leak that seems to be coming from under my dash. After some research it seems to be the infamous sunroof leak. I would rather not have to rip apart my A pillar and dash. The sunroof should provide a decent seal and there are four drains for what seems to me like redundancy / overengineering. Would sealing the passenger sunroof drain with silicone be sufficient?

Thanks

 

Am I reading your solution as: plugging up the [front] right sunroof drain with silicone so that the water will drain out the other three (3) drain lines? It is not a solution I would consider but, hey, it's your car...

The amount of water that leaks through the sunroof glass seal would amaze most people. The seal does not sit as tight against the roof as you might think. I can envision a small puddle forming where the drain line exits and then spilling over onto the headliner- especially when making a turn.

The A-PIllar sunroof drain project is not that difficult. Took me about 2 hours and $10-15 in parts and the roof drains through the AC evaporator drain in the floor. It is aggravating, but doable.

HOWEVER, do not automatically assume the leak is from the sunroof. There is also the firewall wiring harness grommet and, as I am dealing with currently, a failing door seal which is allowing water to puddle on the floorboard.

 

With the right tools it should take you 5 minutes to fix. A 2 foot long flathead screwdriver, 2 foot long needle nose pliers, and a flashlight and new plug. The A pillar just pulls right off. Cut the tape and just pull the tube forward to give it some slack. The tube shrinks over time and pulls the plug out. Then just pull the plug out and put the new one in. I just did my passenger side and it only took me a few minutes because i had already done my drivers side and i knew what i was doing. You don't have to rip apart your dash. You only have to take out the air vent which is only held in place with 1 screw. And a quick way to check if it's the drain is just to take out the vent and look through with a flashlight after pouring a cup of water over your closed sunroof to see if you see it dripping from the plug.

 

I opted to bypass the firewall entirely to prevent ANY water from getting near the wiring harness grommet. Either solution will work.

Everyone has their own method to their madness...

 

Sounds logical. How did you do this?

 

Sunroof Drain Bypass
I did a modified version of the above post. Basically I used a ⅜" barb coupling and spliced a ⅜" ID hose from the A-Pillar, back behind the dash, and through to the floor:

From there I used a ½x½x⅜ barb t-fitting and spliced into the AC evaporator drain hose that exits through the floor. I do not have a pic of the floor drain. With this setup no water from that drain has any chance of leaking onto the electronics.

I used brass and stainless steel fittings. Just my preference. I sourced all of my parts from Lowes except for the t-fitting which I sourced from eBay. Total cost <$20.

Be warned, it will be a aggravating project due to the extremely limited amount of space. I strongly recommend you wear gloves as there are plenty of sharp metal edges. My bloodied fingers and knuckles can attest to that.

 

Hi guys, Iam having the same issue you guys are having. Found water in my floor front and back. So I rerouted the drain lines to the ac line that drains under the car.everything was good,But unfortunately yesterday it started pouring really hard and
come to find out my driver floor well is filled with water ( checked the passenger and it’s bone dry).This is confusing the hell out of me and is driving me nuts. Please any body have any solution or an idea what the issue might be. I have some pictures to understand the situation better.

 

King300, this is on your 2015 Q60? While rare, there is a grommet on the driver-side that has caused some leaking issues. You may want to check this thread for more info.

Also, being a Coupe, you will have to check the door seals, specifically near the mirror "triangle" as water can leak past that seal from the main, exterior, A-pillar door seal (see this thread).

 

Yes the 2014-15 q60 is the same body style as the g37 coupe. What confusing me is that there is no sign of water on my door panel or on my seat or around the door for me. All the water I find is under my floor mat on my driver side it’s a puddle. I honestly don’t know where it can be coming from.

 

And you checked the driver-side grommet issue that I linked to?

You will likely have to use a garden water hose and with that on a light trickle look under the dash and see if you can find the point of ingress.

 

Ya that what I will have to do and see where the water is coming from. It only puddles
up in this one spot .and is the grommet your talking about the sunroof grommet? The plastics thing that attaches to the firewall?

 

He's talking about the huge black rubber wire harness grommet on the firewall.
Behind the pedals, UP AND TO THE LEFT

 

Oh I would have to check there. But how could water get in thru that grommet? Iam suspicious of the door seal and maybe that grommet you mentioned.

 

Did you even bother to read the thread that I linked to in the above post (#10)? In case you missed it, here it is again.

None of this is rocket science. Ten minutes with a moderate spray from a garden hose and you will find the leak.

 

Thank bro. I will read it just didn’t get a chances.