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Many vehicles (I know both my Audis do this) when defrost is selected, will automatically set fan to high and turn on A/C. Any control input will change this "auto defrost" function, but if defrost is selected again, it will revert to the previous. If you are not selecting defrost, yet the fan sets to high and the A/C comes on, I would think your issue is just with the defrost button or contacts. I apologize as I cannot speak to the 987, just Audi and 986.
On an unrelated note, my controls on my 986 were acting up, so I had then control unit replaced. Fixed issue, but the display flashes 7 times on startup. I guess this has happened to others, but I have yet to find a reason why, or what the 7 flashes mean. Porsche dealer said "it should just go away", but never did. No OBC codes, and everything works just fine...after the 7 flashes that is.
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