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Cayman 987 wet passenger footwell

C

cayman_rich

New member
Hi all!,

I'm new to the forum but have owned my 2007 Cayman 2.7 for a few years now and still loving it, such a great car to drive! (it's my first Porsche) This forum seems great and loads of useful info

Here's my issue as the title says I have a wet passenger footwell first found out as was steaming up inside most days and one day when cleaning found under the mat was wet! then found that the whole underneath was also wet so took everything out dried it and tried to find the source...

So I checked all the usual AC Drain and drain holes under the hood by the battery and they where all flowing freely as far as I can tell, also checked the bottom of the door carpet - also dry.
Then I checked the cabin air filter and found that to be sopping wet so I thought aha I've found it! so took the scuttle panel off and found the foam cover attached to that to be broken above and basically pouring the water from the windscreen straight into the AC unit also actually found a nice block of ice in there too so I fixed that and put it all back together thinking I had fixed it to find out a couple of weeks later it's wet again!

So after checking and fixing all that I thought I must have fixed it but no, after a couple of weeks and quite a lot of rain here recently and it's sopping wet again inside
frown.png


I did find a bit of water at the bottom of the AC unit again is this normal, as surely that can't be fully water protected?


My last thought is I have thought that maybe it's the windscreen seal as I had this replaced about 3-4 years ago by Autoglass and maybe they didn't fit correctly?


If you guys have any other thoughts of what it could be that would be great! as this car is awesome and don't want to have a wet floor forever and then smell!

Thanks if you can give any pointers

Rich
 
Hi Rich,

Sorry to hear about your problem.

Just a minor point but I presume that it's fresh water rather than a coolant leak? Certainly it could be a faulty windscreen seal and the only way you're going to find out is by isolating the area around the screen and seal and pouring water over it.

Otherwise you seem to have the most obvious bases covered, including the door diaphragm, but leaks are notoriously difficult to track down. Of course, water could be coming up rather than down - you could try waving a hose on the underside in the footwell area - and should address the question: Does the leak only occur when driving in the rain.

As a last resort you may have to remove the IP to get to the HVAC unit, bulkhead, etc., but that's a major job and best avoided if at all possible.

Jeff

 
Thanks for the reply Jeff,

I'm pretty certain it's fresh water I'm guessing I'd know if it was coolant (smell, colour)?

Good point about it coming from underneath I've not thought of that one, I have been driving it in the rain with the carpet down at the front :( to see if I could see any water - nothing, so underneath could be a possibility! I will try that at the weekend take the seat out and carpets up again and spray some water around

Sorry not sure what the IP is? I've taken the cover from the underside of the HVAC off before and that was dry, taking all of that off does sound like a pretty major job!

Thanks again, Rich

 
Sorry Rich - IP is the instrument panel. Good luck if you need to remove that..!

If it was dry under the HVAC unit at least it sounds as though the leak's not coming from that area, although I suppose that water could still be trickling down the bulkhead. If you remove the carpet, is there dampness present in the bulkhead acoustic treatment? That would be an indication that water is somehow getting in there.

Jeff

 
Ah that makes sense...dumb moment!

Well a bit of an update I took it all apart again yesterday and sprayed a lot of water underneath and over the screen mainly aimed at the air filter area but nothing came through, I took one of the bungs out on the floor and that had a little bit of water underneath so I've sealed that but I don't think anything would have come through but best to make sure! Nothing through the cabin air filter area so that's good that's pretty much definitely not the cause.

But being the UK it rained a lot! last night which was good(and bad) as it's highlighted where it's trickling in :) as I left it all apart for that reason. It looks like it coming through the bulkhead (as you said) where the AC pipes(highlighted in green) come through there is a foam seal inside the car which was wet underneath which joins to a plastic part inside(996-573-421-100) which I gather is a AS Adapter. There are two bolts(highlighted in red) under the bonnet which I'm assuming are attached to this which I've tightened a little as they where not that tight so hopefully compressing the foam a bit more inside to seal but without taking it all out and disconnecting the AC I'm not sure how's best to try and seal it? there is also a pool of water underneath those pipes so eventually I guess it just trickles through.

Link to image in google drive as could't upload for some reason: https://drive.google.com/...MsGRIAvYlVaVTdURVVpdGM

Thanks for you help so far!

Rich

 
Ok so a bit of an update after that last post I have put some closed cell foam around and underneath the metal block where the evaporator pipes connect highlighted in green in last photo to stop the water trickling down the pipes and pooling under there and also put a foam flap above those to stop water from the top as well as tightening the bolts so hopefully all of those together will stop the water :)

Luckily I have access to another car for a few days so I'm leaving in bits to see if it does indeed work...fingers crossed!

 
Well, let's hope that's fixed your problem Rich.

If you're still getting a leak then I'm afraid that the only way to fix it will be to remove the HVAC unit to access the joint, which I fear probably will mean pulling out the whole of the IP to get access. Fingers crossed indeed..!

Jeff

 
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