I have a question about the idling properties of the AC system on my 325iS. When the AC is off, I can rev (at a stand still) to 2000 rpms and the car will drop back to idle within about 2 seconds or less. When I turn on AC and do it again (no matter how long I have AC turned on) the idle down process takes over 5 seconds. I understand that there is supposed to BE ***SOME*** delay...like .5 seconds, but not 3 seconds difference. Any ideas?