Wjkelly3

Had to take my 2013 C4S in for service for the 7th time since purchase (about a year). Had a jacket behind my seat and when I pulled it out it was soaking wet - naturally I was a bit curious and after pulling the rear floor mats I found both rear footwells full of water. The dealer just informed me that direct water pressure on the "plugs" in the front firewall (where the wiring comes through) were the culprit. I am wondering if this is a bizarre one-off or some sort of design problem.

Mondrian

I don't think those rubber grommets can be designed to prevent water entry under pressure as there has to be enough clearance to let the wires through. If you intend to do that you may have to seal it with a heat resistant compound.

Bacura

That's quite upsetting. Nick's electrical problems were due to water as well. Is this common? Was it from rain? Carwash?

Wjkelly3

Seems to have been from driving in the rain but its on my list of issues to monitor now

John's 991

Oh, now I understand why so many Porsche owners don't drive them in the rain.

All kidding aside, it is not normal to have water inside of your car just because you drive it in the rain. All cars have wiring that goes from the engine bay, through the firewall into the cabin. I have driven in the rain, and never noticed any water, but will keep a closer eye on things next time.

It would seem that there would be lots of potential solutions, but sounds like something Porsche should sort out on your car or all cars if it is a widespread problem.

LexVan

Wonder if your AC drain is clogged and discharging into the cabin??

With your AC on, do you see condensate drip below the car's outside area??

GSIRM3

If that was the cause, I think the water would most likely be in the front footwells, not the rear.

Noah Fect

Unless you parked on a fire hydrant, I don't see how the dealer could be correct about this.

chuck911

There is some black gooky stuff, forget what its called, that is like a very sticky putty. You get this stuff, put some latex gloves on, and (from the outside) mold it around those entry points. It stays soft and pliable (and sticky!) forever. But it won't permanently stick to wiring or anything else and can be cleaned off with the right solvent. It will be the end of your problems. Sound by the way travels through these same little holes, so putting an end to that is a little extra bonus for your troubles. Got to give credit for this trick to the great Squire Tomasie of Squire's Autowerke.

ipse dixit

You mean ... Bondo?

Duke I

In had water collecting in the rear footwell area due to plugged condensation drains. Not a Porsche, however.

Hammer911

just don't use too much... (this is what you get when you google "black gooky stuff")

Zohan

"auto goop" works good for this kind of thing.

Justin N

No one should be putting "auto goop" or anything else with goop in the name on a $100k+ car. I had a similar problem on a z4 and it is a simple matter of clearing some ground up leaves and junk out of a drain. I'm not so sure if there is a drain somewhere affecting this area- maybe inside the door?

sgroer

If the footwells were full of water, I see no possible way that could be from water intrusion in the rain. Do you have a sunroof? Clogged sunroof drains are a notorious "water in footwell" culprit in the world of Audi - maybe something similar. I'll bet your dealer $100 it's not from "high pressure rain" while driving.