It seems that this problem is more common with cars in warm, moist areas: Texas, Florida, Louisiana etc. I don't think Germany gets warm and moist very often.
If you live in Texas and want your A/C to be all that it can be, the DIY repair should make a big difference.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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