on for a few seconds. Auto mode on the ACC will use the A/C compressor regardless of outside air temp unless the 'freeze sensor' in the A/C plenum [on the coils] gets too cold, sensing frost build up. Then it won't cycle.

I think it runs in the winter to continue to help dehumidify the cabin air, which is why I can load my Saab w/ my wife, three girls, and a dog, and drive in nasty, cold, rain mixed with snow, mid 30's F, and still see out the side windows. It's mission: impossible to do the same in our '01 Suburban [in part because the A/C compressor is locked out below a certain outside air temp.]

You can test this in your garage - open the hood, let the engine idle, and stand in front watching the lights and aux A/C fan. With Econ on the ACC, I'll bet you won't see a flicker at all. Select 'Auto' and you'll see/hear both the aux fan and the radiator fan cycle on with the compressor - and you'll see the lights dim slightly [on certain, newer, model years, as I mentioned in the first post ... the '86 & '87 9000's we had didn't flicker a bit].

• Headlights dim while driving...?, ToddInMA, Tue, 5 Feb 2008 18:11:06
  • It's the aux A/C cooling fan kicking in ..., jrfitz81, Thu, 7 Feb 2008 19:14:43
    • Cooling fan in February in New England?, ToddInMAq, Fri, 8 Feb 2008 06:31:28
      • the aux A/C fan cycles each time the compressor kicks.., jrfitz81, Sun, 10 Feb 2008 16:00:10 <-- Viewing This Message
    • not that it's a huge deal, but prior posts ..., jrfitz81, Thu, 7 Feb 2008 19:29:59
    • by the way, if anyone needs an aux cooling fan assembly, jrfitz81, Thu, 7 Feb 2008 19:18:24
  • Re: Headlights dim while driving...?, kandj , Wed, 6 Feb 2008 18:23:57
  • Re: A/C cyling, Dale, Wed, 6 Feb 2008 08:32:24
  • Re: Headlights dim while driving...?, John Curran, Wed, 6 Feb 2008 07:05:49
    • Not A/C related, ToddInMA, Wed, 6 Feb 2008 08:39:38
      • Re: Not A/C related, John Curran, Wed, 6 Feb 2008 10:46:05
        • Re: Not A/C related, ToddInMA, Wed, 6 Feb 2008 11:05:32
          • Re: Radio Code, Dale, Thu, 7 Feb 2008 08:50:12
            • Re: Radio Code, John Curran, Fri, 8 Feb 2008 16:27:53
              • Re: Radio Code, ToddInMA, Mon, 11 Feb 2008 11:56:12
  • Re: Headlights dim while driving...?, marvinstockman, Wed, 6 Feb 2008 05:49:22
  • Re: Headlights dim while driving...?, Oliversexpedition, Tue, 5 Feb 2008 18:53:02

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