I am not quite understand what the manual means. It does not make sense to have the compressor to run all the time without a compressor clutch. I am not sure, may be that is how the auto climate control works.
It should be easy to check, jack up the car and look at the compressor to see if there a clutch. Or call up the Porsche Parts and ask for a compressor clutch for 2005. HTH.
Later
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