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Help Needed - water leak, possible drainage blocked

SciroccoR

Member
Joined
17 May 2016
Messages
9
Hi All,

I don't know if this have been covered elsewhere but I could find anything.

I have some water building up behind the passenger seat in my 987 Cayman S. I can't find any leak where the water is dripping from and from reading some of the forums it sounds like it might be an issue with the drainage ducts. Weirdly I have purchased a trombone cleaner to try to clean them out.

My issue is locating/ accessing the ducts. I have found diagrams and explanations on how to access them on the boxster which looks pretty straightforward however I can't find anything for the Cayman.

Has anyone ever had this issue and cleaned out the ducts? I am not the most mechanically skilled so wondering wether to take it to Parr to get them to clean it out. Has anyone ever done that and has any ideas of costs?

Any advice would be really helpful because this weather is doing me zero favours.

Thanks

Greg
 
I'm new to a 987.1 Cayman. On this car, from what our resident Tech said, there are only two drainage holes. They're either side of the battery in the front boot under the plastic trim. They are outlined in black rubber and easy to gain access too.

Unfortunately however, your issue seems to be else where. Your issue sounds like that of the Boxster as I believe there is a pan situated behind the seats or at least more drainage particulars due to the soft top.

Demort is your man, he's a technical wizard and he will be along at some point.

I'd say this sounds more like the water is coming in through the passenger door though. There are grommets, I believe, at the bottom of the door. Two black rubbery things. Check them out! Normally if you have door issues, say a problem with the waterproofing membranes, you'd expect the carpeting at the bottom of the doors to be sodden. Check that out!

Sorry can't be of more help, I'm new to the fold.
 
Just noticed you profile name, I came over from a mkIV R32.

Once you've got to the bottom of your issue. It's worth bearing in mind that the water can apparently get trapped in the padding/insulation under the carpets. So worse case scenario, you may need the carpets out for a proper dry!

I would also get to Homebase and purchase a Silica Crystal Dry Box to leave in the car. They draw moisture well from enclosed areas like cars and cupboards etc.
 
Interesting

I had all the sensors changed recently and Parr cleared out all the front draining ducts. I assumed there were also some in the rear but maybe that is just the boxster due to the hood.

I have checked all down by the door seals and there is no moisture there. It's almost like it is coming from below.

I have had the hair dryer on it to dry it out mostly and keeping it under a tarpaulin at the moment until fixed.

Sounds like I might need to go down the Porsche specialist route which I guess will be a decent size hit to the wallet. On the plus side I'll have a fresh trombone cleaning kit if I ever take that up.

Yeah I loved my Scirocco R. Didn't drive like the Cayman. But I never had a problem with it in 3 years. I guess that's a 10 year old sports car for you.
 
So the carpet on the doors is 100% dry then?!

Water under the seats isn't great as some models have some of the car's electronic systems under there. Take its just wet carpet and no modules/systems are under there risking damage?!

Demort will be along I'm sure.
 
As you rightly say , the rear drains on a Boxster are there because its a cab , not fitted to a Cayman im afraid.

Unusual for a Cayman to have a water ingress fault , the usual place when they do is the door membrains which in this case is a steel plate covering the window mechanism with a rubber seal that perishes over time , or if the door card ( panel ) has been removed incorrectly it can get damaged.

First thing to check is under the pasenger seat .. if its starting to get wet there then get some towels down to mop it up .. x2 control units there and if they get wet your car wont be starting anymore.

For the leak then get someone to hose down that side of the car whilst you are in it and looking ( passenger seat tilted and moved forward ), if the door card seal has gone and from your description then i would expect the leak to be at the seat belt end of the door .

Moving on from that then the next step for me would be to remove the trims around the window / rear inspection cover and retest .

I suspect though its the n/s/f membrain that is at fault.

Labour of about 1.5 hours to replace , not sure of the part cost though .

Fyi the carpet has about 2 inches of foam under it .. its a huge sponge basically , only way to get it properly dry is either lift that side and fit a dehumidifier or remove and hang till dry .


Cheers Marty :)
 
You've taught me well, Obi Wan.
 
If its not the door membranes, which as said is a regular suspect, I do recall a Boxster owner having a damp issue which was eventually traced to a missing grommet in the floor.
 
Thanks for the advise all. Some good knowledge there.

I am aware the ECU is under the passenger seat so the car has been under tarpaulin for the last 3 days. I've had the carpet up and the hairdryer on it. A few mini dehumidifiers in there. It's pretty much dried out now.

The door membranes were recently replaced by Parr.
However I did check around the door seals when I found the wet patch. Just re-checked again and no moisture or sign of a leak.

I'm at a bit of a loss as to where it's coming from. The floor seems likely as that is the only bit that's wet.

Think I might have to take it in for some hopefully not too expense investigation.

If anyone else has any other ideas I'm I'd be glad to hear them.
 
Hope you get it sorted, report back with your findings.

Floorpan grommet allowing ingress from underneath sounds interesting, I'm yet to get under mine on a ramp.
 
981 / 991 suffered from a blocked grommet in the floor pan which stopped water draining out .. there was a recall on it to replace them .

For a 987 grommet fault then the car would only get wet when driven , the water amount wouldn,t be that great but im afraid off hand i dont know with out removeing undertrays and looking if theres a suitable grommet that could cause this .

I can say ive not come across it so far though .

If door seals are 100 % ok then i would move to the rear window seal but as said above you need to strip panels and water test .. which to be honest is what we do with any water leak , if no leaks found from above ( normal water ingress ) then we move to below .

Water leaks can often be far removed from where the actual water leak is found .. it can be a pain to find them .

A garage might be best to locate this fault i feel :)

Many good indys in your area , i should know .. i work at one of them lol .

EDIT ..

Its not actually the ECU or DME , its the rear CU and park assist cu there .. rear CU is part of the alarm system , if it gets wet then rear lights stay on , spoiler goes up alarm faults etc etc :)

Boreing fact of no real interest really .. sorry .
 
Can't remember which model Boxster it was, but I think the actual grommet was missing once trays etc were removed, but in all the forums I read its the only time I've seen it mentioned, The usual is doors, and for Boxsters blocked drains.

Good luck in the hunt!
 
RCS said:
Can't remember which model Boxster it was, but I think the actual grommet was missing once trays etc were removed, but in all the forums I read its the only time I've seen it mentioned, The usual is doors, and for Boxsters blocked drains.

Good luck in the hunt!

Anythings possible in this game , ive seen some very weird things over the years and its always best if everyone posts what they think :)
 
So I've booked the car to go into Parr tomorrow.

Hoping they will be able to identify and fix fairly quickly/cheaply but I have a horrible feeling it might be a tricky one.

I will let you know the outcome when it's fixed.

At least it should fix the issue of my windscreen steaming up every 2 minutes.

Greg
 

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