Get that condensation about 30% of the time, its normal
They redesigned the coolant cap times - its no necessarily the coolant cap - that area seal against the boot lid, so a warm coolant tanks on a cold night spells condensation every time
Happened to me too...I had the old cap ending in .00 and replaced it with a cap ending in .01. Never happened since and it has been 3 months now. I also did notice the water level in the coolant tank was slowly going down. The new cap fixed all of the problems. The cap will run you $20 or so and is worth changing regardless! Good luck!
Paul
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2000 Porsche Boxster S
2007 Lexus RX350
Bottom line... wipe your finger through that "condensation" and check it out. If it's simple condensation it will feel like water. If it's a problem, it will feel slick, a little oily on your fingertips. That's coolant, and it is NOT normal. A repair is required.
I was going to taste it because animals like the sweet, deadly taste of anti-freeze.. Nah - I just ran it 'tween my finners and it's 'greasy': coolant.
Thanks for the feedback. I check the cap p/n and make an appointment. .. amd burp this thread.