Moisture in frunk even after cleaning out drains and weather seal

Weather strip appears to be good as it passed the water hose test and the rain. But I still am getting condensation on the hood and as a result on my amp (aftermarket, mounted where the Cd changer was). There�s a clear line of where the weatherstrip is. Both battery drains were cleaned out and I thought that somehow that was causing the issue as those were clogged but I�m still getting condensation in the trunk. Pulled out carpet and it�s dry, but underneath the floor was damp and it was sweating. Couldn�t find any sort of drain plug there. I have DampRid in there now, but it doesn�t seem to be doing anything as I still had condensation on my hood this morning.

Two possible tests to help track down the leak: 1) pull the carpet out and dry it as best you can. Lay down colored construction paper and put the carpet back on top. Drive it a bit, then pull up the carpet and look for any area that changed color, that may tell you where to look. 2) Borrow or buy (they are cheap and have a use) a UV flashlight. Antifreeze will glow under UV light. If it glows, you will know where it is coming from!

Looks like those two little dark grey plugs are where water is pooling and the floor is sweating as a result. All the seams are bone dry, the carpet is a little damp on the floor probably as a result from the water pooling there�gonna bust out the hair dryer for the carpet. It�s definitely just water and not antifreeze. Is it fine to pull those plugs and/or completely seal it with rtv/sealer? They don�t seem to be designed to be pulled out.

Nate- Is the car out in the rain (you are chasing a leak) or have you got some unique AC line routing and have humid air (you are chasing condensation)? Your testing with hose could check for leaks, but wouldn�t help if you have a condensation problem. Any way for you to give us an idea of which of these has been the more recent circumstance that is driving your water issue? Thanks!

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Car is sits outside in the driveway. No leaks from what I can find. There�s no drip marks from anywhere, just moisture building up in two places: the underside of the hood and on the floor of the frunk. Nowhere else It�s pretty evident as when the moisture is built up, there�s a clear outline of moisture where the weather seal is against the hood. On the floor it�s only in the center, it doesn�t condensate up onto the walls. It hasn�t rained for a few days (well, it did last night�on to that in a minute), I popped the hood yesterday morning and that�s when I spotted the small puddle near those grommets and again condensation on the hood and floor only (predominantly where the carpet wasn�t completely dry). It could have been from me not completely drying out the carpets when I first stumbled on the issue a few days ago. So after seeing that again, yesterday afternoonI snapped that picture, I dried out the carpets, and left the hood popped for a few hours in direct sunlight to completely dry it out. I put some Flex Seal tape over those two dark rubber grommets as a test and there was no condensation this morning despite it raining shortly last night, so maybe those grommets are bad and not completely sealing off like they�re supposed to. I�m wondering if my frunk is TOO sealed up (I have to press rather firmly on the hood to completely latch it) and it�s like a Tupperware container: it being completely sealed with no vent causes the inside to condensate from lack of equilibrium. Or am I just over thinking this?

If you live in a high humidity area (Houston, Miami, Panama, etc.) but have overnight temps dropping down below 40F, then I could believe the condensation from trapped air. But this would have to be some pretty unique circumstances and would clear up when your overnight temps remained high. Are you at all running your AC? This is one source that would definitely provide the cold temps for condensation�but you would then have to figure out how this condensation is getting into the frunk. Failing either of these, then it�s probably a leak. Have you checked for any additional holes in the frunk? Places where modifications may have placed another pass through to the frunk (my car had a an amp installed, this created another hole into the frunk).

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I do live in a high humidity area (SC) and the night temps have been in the low 60s with daytime temps in the high 80s by like 11am. I also am running the AC. As for the amp, it�s mounted in a spot where the CD player was: I just now noticed those holes there (I put that piece of plastic over the amp so condensation won�t drip into it)�are those supposed to be plugged up or were they plugged up when the CD changer was mounted there? I can�t remember. Maybe sealing those up wouldn�t be a bad idea or would those be good for equalizing temps? There�s zero moisture in that area and the carpet is dry(it was never wet there anyways). As for a leak, it just dumped rain for a few hours. Frunk is still dry and no condensation anywhere so far after yesterday�s drying and sealing over the grommets (not sure if that�s even the problem, just an observation).

[WARNING: internet WAG] How hot does that amp run? You could be condensing moisture out of the air due to high heat in the frunk.

You can get a rechargeable dehumidifier on amazon for like $15, throw one in up there and see if it can keep it dry, otherwise it seems like some kind of leak.

Those hole plugs seal holes used for spot welding tongs. Under the car they are covered in undercoating or seam sealer. You might check if they are still sealed underneath.

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Never thought about how hot it runs�but that�s an interesting observation and something I gotta keep track of now�I�d think if it ran hot it�d condense around there more so than other parts, but it seems pretty evenly condensed and that spot was always dry. Regardless of figuring this out or not, I�m gonna keep some DryTote desiccant in there just in case now that the guy above pointed out it may very well be the amp that�s causing the issue. Looked at a desiccant calculator and it seems 200g worth should keep it dry. Checked underneath, it�s undercoated, so I�m not sure wtf is happening with those if it was just coincidental and/or the lowest part of the trunk where water pooled anyways. But, there�s still no condensation build up after completely drying it out and flex taping over those plugs. Next experiment is going to be running the AC and see if maybe that pump (or whatever that is on the passenger side) is causing it. These past two days I haven�t been using the AC to minimize variables and it�s been remaining dry.

Because I hate it when people don�t post updates and likely found a solution� Looks like those dark grey plugs were the issue. Ran the AC with it taped up, dry as a bone. Did the same trip with the same conditions with them untaped and boom, condensation. No rain, so not an infiltration or leak, but something is going allowing the air in and condensation to build up� Dried everything up, tape it up again, do the drive again with AC and dry as a bone. So if you�re getting condensation with no evidence of a leak, check those plugs�they might have aged and are now just leeching moisture in and it gets trapped.

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This is what mine looked like when I had it apart for the amp upgrade.

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you seem to be missing the lines and compressor/pump/ thing that run along that shelf where the carpet cutouts are that I have�what is it?

The extra pieces are on cars with PSM. The precharge pump is under the cover on the passenger side. Why Porsche did this boggles the mind; the Turbo precharge pump is under the master cylinder which is a much simpler install.

BTW, when I was removing those plugs, one ended up getting completely mangled. I came up with part # 999.703.455.01 if you want to seal those up. This is for the large holes, not sure about the part # for the small one.