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Old 05-14-2010, 04:12 PM   #1
Homeslice
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Question WTF does Max A/C do?

I've heard people say that the only thing Max A/C does is simply operate the flap which shuts off outside air, so that air inside the car gets cold faster. But if that's all it does, then why does the fan speed increase as well?
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Old 05-14-2010, 04:14 PM   #2
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Might be an aux fan that guides the recirc air to the inlet
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Old 05-14-2010, 04:17 PM   #3
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Might be an aux fan that guides the recirc air to the inlet
Hmm......I thought there was only one fan (usually on the firewall near the wiper motor)
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Old 05-14-2010, 04:19 PM   #4
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I always thought it was because of different pressure in the car once the air is being recirculated making the fan blades go faster.
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Old 05-14-2010, 04:23 PM   #5
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None of my cars have that. Auto climate control FTW.
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Old 05-14-2010, 04:33 PM   #6
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None of my cars have that. Auto climate control FTW.
Several cars, like the Ford Fusion, have both automatic climate control and a max A/C setting.
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Old 05-14-2010, 04:46 PM   #7
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None of my cars have that. Auto climate control FTW.
It may not be labled "MAX A/C" but if there's a button that recirculates the air you're doing the same thing.
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Old 05-14-2010, 04:48 PM   #8
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Quote:
Originally Posted by Homeslice View Post
I've heard people say that the only thing Max A/C does is simply operate the flap which shuts off outside air, so that air inside the car gets cold faster. But if that's all it does, then why does the fan speed increase as well?
My guess, and it may be what Particle man meant as well, is when the A/C is set to get fresh air it is putting new air in the car. The old air has to be forced out somewhere creating higher pressure in the cabin. The fan runs slower because it has to overcome that pressure differential to get the new air in the cabin. When set on recirc it is drawing air from the cabin, cooling it, then replacing it back in the cabin. The fan does not have to work against the increased cabin pressure, its job is easier, and as a result it can run faster. I know in my truck when the A/C is set to get outside air its output increases if I crack the window open.
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Old 05-14-2010, 04:54 PM   #9
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Originally Posted by goof2 View Post
My guess, and it may be what Particle man meant as well, is when the A/C is set to get fresh air it is putting new air in the car. The old air has to be forced out somewhere creating higher pressure in the cabin. The fan runs slower because it has to overcome that pressure differential to get the new air in the cabin. When set on recirc it is drawing air from the cabin, cooling it, then replacing it back in the cabin. The fan does not have to work against the increased cabin pressure, its job is easier, and as a result it can run faster. I know in my truck when the A/C is set to get outside air its output increases if I crack the window open.
you said it a helluva lot better than I did
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Old 05-14-2010, 11:24 PM   #10
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you said it a helluva lot better than I did
With the benefit of time a shit sandwich can be made to sound good. I think I got where you were coming from.

Homeslice, yes, people are too stupid to understand what recirc will accomplish. The "too stupid" factor dictates far too much of car design today.
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