coolant tank condensation debugging

[kk2002s]

I have been getting condensation for the last few months.
History:
This time last year replaced expansion tank (German brand)
Early spring new WP, Thermo, Coolant Flush, replaced using a UView. Everything dry and working well
So I just replaced Cap again. Had the 04 before. Still condensation
So it hit me how to isolate the parts using sandwich bags and clear plastic wrap.
It's hard to see in the picture but after driving around at operating temps, Only the bag around the Purge valve shows condensation.
Now what to do. My knee jerk reaction is to order a new Purge valve.
I thought about just O rings but not sure they can be ordered separately
German purge valve $38, Porsche $86.

[JFP in PA]

Originally Posted by kk2002s

I have been getting condensation for the last few months.
History:
This time last year replaced expansion tank (German brand)
Early spring new WP, Thermo, Coolant Flush, replaced using a UView. Everything dry and working well
So I just replaced Cap again. Had the 04 before. Still condensation
So it hit me how to isolate the parts using sandwich bags and clear plastic wrap.
It's hard to see in the picture but after driving around at operating temps, Only the bag around the Purge valve shows condensation.
Now what to do. My knee jerk reaction is to order a new Purge valve.
I thought about just O rings but not sure they can be ordered separately
German purge valve $38, Porsche $86.

Is the "German brand" a factory tank? If not, stop messing around and get one. We have never had any luck with aftermarket tanks.

[Gelbster]

Me neither. I hate to support the Porsche tax but....
for the price of a few O rings -why not try it. If it works, publish the results here and be a hero !

[particlewave]

Pull the purge valve o-rings, take them to the hardware store and get new for less than $1.
No need to order a new valve or anything Porsche specific.