Up until 2010, at least, the compressor will only cycle with the a/c on or in one of the defrost modes. The only other time a compressor will do this is if there is low "freon" (or whatever is in there now). But, as others indicated, make sure everything is off and you're not in auto mode. If it still does it check with the dealer because it doesn't sound right. Maybe something was changed for 11 to make it cycle in order to keep the oil flowing and seals lubed.