Its funny that you found that since I tried to yesterday and couldn't. The dealer gave me a copy of the Service Bulletin which he said he'd never seen before yesterday. I wish I had it electronically because its actually quite funny.

Essential it says, and I'm paraphrasing...

...
On 2003 and later models...
If the mode selector is set to defrost or foot/defrost AND the outside air temp is about 36F, then the compressor will run with the mode selector switch in any position
...

Really, I'm serious. It says in defrost mode, the compressor runs in all modes. I asked the dealer what that meant and he didn't understand it either. I asked him what the A/C button did and he said that as he read it, the A/C button didn't do anything on 2003 models.

I smell a serious issue or recall coming. That service bulletin makes no sense and is written like its trying to explain away a problem.