I have rented enough different cars to know that some cars think they're smarter than I am and automatically turn on the A/C when I try to recirculate. On some cars, they'll only do it if the defroster vents are selected to avoid fogging the windshield, and on others, it will always come on with the recirculate button selected. (And some cars turn on the A/C light, and some don't.)
My '04 Saturn turns on the A/C silently (no light) whenever the dial is set to defrost--even if the recirc is not on. One of these days, I'm going to pull that panel and cut that wire...
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