It looks like a problem with the bleeder valve.....

too much residue and fairly wet around that area, valve was/is closed.
I checked after a short drive, seems that the valve isn't holding.
Quote:
Originally Posted by Burg Boxster
the latest cap version is .04 but generally speaking, the .01 thur .04 designs are very similar. The .00 design was vastly different and very weak (had a rounded inner flange).
If you've already checked under the carpet and barring any other signs of a leak, and if the cap is on tight (the p/n should be a the 6 o'clock position when standing at rear of car) you're in all likely-hood good to go. For the sake of argument though, remove the coolant cap, oil filler cap, and black cover plate below them (it'll pry right up) . Check the coolant tank bleeder valve (a black cap w/ what looks like 1/2 of a binder clip on top) and make sure it's in the down/locked (parallel to the road) position and there isn't any (more than a possible trace) white residue around it. If in doubt, you can have (almost any shop) run a quick pressure test on the cooling system (about 20min).
FWIW, I used to get similar condensation occasionally, depending on climate conditions, w/ my '99 Boxster but never had any issues.

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