Roof/Cowl Drains - Rennlist - Porsche Discussion Forums

Notices
Cayenne 955-957 2003-2010
Sponsored by:
Sponsored by:

Roof/Cowl Drains

Reply

Old 03-12-2018, 11:16 AM
  #1  
kraeburn
User
Thread Starter
 
kraeburn's Avatar
 
Join Date: Mar 2006
Location: RI
Posts: 72
Default Roof/Cowl Drains

I dropped the pig off at the indy today to let them figure it out but I have been getting water in the driver's side footwell. I have searched far and wide both on this forum, youtube, and others but have been unable to solve it.

Fortunately, I have been able to dry the area out completely and the wiring harness was unaffected so no worries there. Here is the timeline of what has occurred:

-Girlfriend remarks that it smells musty in car, I of course didn't realize it since I drive it every day. After she mentioned it I notice that it does, indeed smell like there is moisture in the car and notice that the driver's side footwell is completely soaked.
-I pull the rug up a bit and see that there is about 1/2" of water under the rug-it is seriously soaked in there. Luckily it has not spread far and I put a household dehumidifier in the cabin, plus a fan, and sop up the water so it dried out completely after only a couple days. I kept putting the dehumidifier in the car overnight to be sure.
-I checked the sunroof drains with a visual check (nothing obvious blocking them) and also poured water into all 4 of them to ensure proper operation. They all functioned fine.
-I then checked the sill drains. The plugs had already been removed and there was no water in there.
-After that I checked the drains ahead of the firewall-bingo (or so I thought). Standing water in there as well as sludge from crap building up. I partially removed the wheel well liner and removed the plug on the drivers side and tons of water came out as well as all the crap that had built up. I did not put the plug back in as it seemed unnecessary.
-Finally, I checked the rest of the cabin for water intrusion and found absolutely nothing so I assumed that I had the issue licked. I had my celebratory beer, swept out my garage (the cowl drain made a big mess) and felt great about myself for conquering the almighty Pig.

Fast forward a week or so to the crazy rain we had last week. I happened to peek under the floor mat and it was soaking wet again. I rechecked the front drain and it was bone dry. The indy is going to check the drains themselves but I'm at my wits end. Where else could the water be coming from? The only thing I have not done is check the A/C drain but from what I gather that affects the passenger side which has been bone dry.

Any input?
kraeburn is offline  
Reply With Quote
Old 03-12-2018, 12:15 PM
  #2  
deilenberger
Moderator
Rennlist Member
 
Join Date: Mar 2011
Location: Spring Lake, NJ, US of A
Posts: 4,416
Default

Sure - but it might be helpful if you gave us info on year of your pig..

On my '06 CS - I went through all the known drains looking for a leak that only flooded the passenger's footwell in heavy rains or automated car washes. Finally found it. Somewhere here I have a posting with photos.. but a brief description of what I found.

Under the hood - there are foam/rubber barriers around the area of the hood hinge - that direct water off the windshield down to the outside of the engine compartment. They also direct any debris. The path of the water goes by the seam between the firewall and the steel fender liner. Right above that seam in the firewall I found a hole about 1.25" diameter - and behind it I could see one of the main wiring bundles that leads to the fuse box on the passengers side end of the dash. In the "V" of the seam - debris had built up, and I could see a high-water line that was even with the hole in the firewall. It seemed rather obvious to me that water would flow down to that location, directed by the foam/rubber barrier - and build up in the V until it reached the level of the hole - and from there - go directly into the passenger compartment following the wiring down to the fuse box.

Fix was to find a plastic body plug that filled the hole (surprisingly I had one that was an exact fit - leftover from a BMW project) - then clear the debris out of the way in the "V".

No more leaks. That was the end to a 2 year saga of chasing the leak.. and doing all the other drains/plugs/etc that everyone else found. I saw no way the plug could have fallen out, and no reason for it to have been removed - so I'm guessing it was missing from the get-go.. overlooked at the factory.

You'll need a bright maglite to see it - and you'll have to move the rubber barrier around the hood hinge out of the way a bit. See if yours is missing..
deilenberger is offline  
Reply With Quote
Old 03-12-2018, 01:13 PM
  #3  
Andy E.
The V8 Porschephile
Rennlist Member
 
Andy E.'s Avatar
 
Join Date: Jun 2001
Location: Montreal,CDA
Posts: 2,235
Default

This will happen to me on the rare occasion when we have rain during above-freezing temps; followed by a mixture of an overnight freeze and wet snow.

I'm led to believe that the sunroof drains are freezing causing the wet snow to melt around the perimeter of the sunroof and then pour down the A-pillars. Short of using dye to prove my point, I'm still looking...
Andy E. is offline  
Reply With Quote
Old 03-12-2018, 03:43 PM
  #4  
kraeburn
User
Thread Starter
 
kraeburn's Avatar
 
Join Date: Mar 2006
Location: RI
Posts: 72
Default

Originally Posted by deilenberger View Post
Sure - but it might be helpful if you gave us info on year of your pig..

On my '06 CS - I went through all the known drains looking for a leak that only flooded the passenger's footwell in heavy rains or automated car washes. Finally found it. Somewhere here I have a posting with photos.. but a brief description of what I found.

Under the hood - there are foam/rubber barriers around the area of the hood hinge - that direct water off the windshield down to the outside of the engine compartment. They also direct any debris. The path of the water goes by the seam between the firewall and the steel fender liner. Right above that seam in the firewall I found a hole about 1.25" diameter - and behind it I could see one of the main wiring bundles that leads to the fuse box on the passengers side end of the dash. In the "V" of the seam - debris had built up, and I could see a high-water line that was even with the hole in the firewall. It seemed rather obvious to me that water would flow down to that location, directed by the foam/rubber barrier - and build up in the V until it reached the level of the hole - and from there - go directly into the passenger compartment following the wiring down to the fuse box.

Fix was to find a plastic body plug that filled the hole (surprisingly I had one that was an exact fit - leftover from a BMW project) - then clear the debris out of the way in the "V".

No more leaks. That was the end to a 2 year saga of chasing the leak.. and doing all the other drains/plugs/etc that everyone else found. I saw no way the plug could have fallen out, and no reason for it to have been removed - so I'm guessing it was missing from the get-go.. overlooked at the factory.

You'll need a bright maglite to see it - and you'll have to move the rubber barrier around the hood hinge out of the way a bit. See if yours is missing..
It is an '04 Turbo, thanks. I think I got info about the other drains from an old post of yours actually so thank you for that also.
kraeburn is offline  
Reply With Quote
Old 03-12-2018, 04:18 PM
  #5  
kraeburn
User
Thread Starter
 
kraeburn's Avatar
 
Join Date: Mar 2006
Location: RI
Posts: 72
Default

Originally Posted by Andy E. View Post
This will happen to me on the rare occasion when we have rain during above-freezing temps; followed by a mixture of an overnight freeze and wet snow.

I'm led to believe that the sunroof drains are freezing causing the wet snow to melt around the perimeter of the sunroof and then pour down the A-pillars. Short of using dye to prove my point, I'm still looking...
I had the same thought but the volume of water I found in my instance made that seem unlikely. Also, there was no sign of water around the base of the a-pillars. I also hardly ever use the sunroof and it seems to seal up pretty good so I doubt much "stuff" could get in and clog them.

According to the indy, the passenger-side cowl drain was heavily clogged so maybe, somehow, it made its way over to the driver's side. I was planning on clearing that one soon but since I wasn't seeing moisture on that side I didn't think it was necessary to address now. The mechanic also checked and cleared all of the other drains in case there was some kind of build-up.

This vehicle is surely testing my patience. I enjoy working on it but do not enjoy playing whack-a-mole with some of the issues.
kraeburn is offline  
Reply With Quote
Old 04-16-2018, 10:47 AM
  #6  
kraeburn
User
Thread Starter
 
kraeburn's Avatar
 
Join Date: Mar 2006
Location: RI
Posts: 72
Default

Originally Posted by deilenberger View Post
Sure - but it might be helpful if you gave us info on year of your pig..

On my '06 CS - I went through all the known drains looking for a leak that only flooded the passenger's footwell in heavy rains or automated car washes. Finally found it. Somewhere here I have a posting with photos.. but a brief description of what I found.

Under the hood - there are foam/rubber barriers around the area of the hood hinge - that direct water off the windshield down to the outside of the engine compartment. They also direct any debris. The path of the water goes by the seam between the firewall and the steel fender liner. Right above that seam in the firewall I found a hole about 1.25" diameter - and behind it I could see one of the main wiring bundles that leads to the fuse box on the passengers side end of the dash. In the "V" of the seam - debris had built up, and I could see a high-water line that was even with the hole in the firewall. It seemed rather obvious to me that water would flow down to that location, directed by the foam/rubber barrier - and build up in the V until it reached the level of the hole - and from there - go directly into the passenger compartment following the wiring down to the fuse box.

Fix was to find a plastic body plug that filled the hole (surprisingly I had one that was an exact fit - leftover from a BMW project) - then clear the debris out of the way in the "V".

No more leaks. That was the end to a 2 year saga of chasing the leak.. and doing all the other drains/plugs/etc that everyone else found. I saw no way the plug could have fallen out, and no reason for it to have been removed - so I'm guessing it was missing from the get-go.. overlooked at the factory.

You'll need a bright maglite to see it - and you'll have to move the rubber barrier around the hood hinge out of the way a bit. See if yours is missing..
Still chasing this down...

Do you need to remove the plastic cover to get at this area or is this something I can access from inside the cabin or by removing the smaller service panel? The big plastic panel is a bit of an annoyance since I would have to remove the wipers and such to get it off. I'll do it if its necessary but if I don't need to I'd rather not. I shined a light in there and didn't see anything missing.
kraeburn is offline  
Reply With Quote
Old 04-16-2018, 02:52 PM
  #7  
deilenberger
Moderator
Rennlist Member
 
Join Date: Mar 2011
Location: Spring Lake, NJ, US of A
Posts: 4,416
Default

Originally Posted by kraeburn View Post
Still chasing this down...

Do you need to remove the plastic cover to get at this area or is this something I can access from inside the cabin or by removing the smaller service panel? The big plastic panel is a bit of an annoyance since I would have to remove the wipers and such to get it off. I'll do it if its necessary but if I don't need to I'd rather not. I shined a light in there and didn't see anything missing.
You have to remove the engine compartment beauty trim that surrounds the engine compartment, but you don't need to remove the actual cowl panel (that the wipers come through..) Follow the path the foam U's under the hinges take - they are what directs water from the windshield down to the area where I found the leak. There's probably a path left from stuff (leaves, whirligigs, etc) on the inner fender surface that can guide you.
deilenberger is offline  
Reply With Quote

Thread Tools
Search this Thread

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: