C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

possible to force AC on in cold weather?

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Old Jan 8, 2004 | 11:23 PM
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possible to force AC on in cold weather?

Is it possible to force the AC to stay on in cold weather to keep the humidity in the cabin low so the windows don't fog up?

In my BMW there is a seperate AC on/off button to keep AC compressor on in any weather, but in my new c230 there isn't such a button, only an AC off button. and when it rains, the windows get all fogged up quickly.

thanks!
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Old Jan 9, 2004 | 02:25 AM
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if the button is not in the off position then the ac compressor will come on as needed
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Old Jan 9, 2004 | 03:44 AM
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I think that if your defrost is on it automatically runs the AC to get the moisture out of the air, thats the way most cars work
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Old Jan 9, 2004 | 11:09 AM
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The Defrost button does just what you want. Then put it back in auto and all should be fine.
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Old Jan 9, 2004 | 12:16 PM
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Yes but when you hit the defrost button, it blows wind at the hottest setting and at full blast.

Is there a way to have it on constantly, without blowing at full blast?
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Old Jan 9, 2004 | 03:18 PM
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Originally posted by thenew3
Yes but when you hit the defrost button, it blows wind at the hottest setting and at full blast.

Is there a way to have it on constantly, without blowing at full blast?
Yes, check your manual.
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Old Jan 9, 2004 | 11:30 PM
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it's a used car, didn't come with a manual.

Otherwise I would read it.
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Old Jan 10, 2004 | 03:09 AM
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Why didn't the manual come with the car when you bought it second hand?
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Old Jan 10, 2004 | 06:49 AM
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Because I got the car from my parents who recently moved, so everything is still in boxes somewhere.
When they get a chance to unpack and once they find the manual, they will mail it to me. But until then, I'm SOL, since MB does not provide manuals online like BMW.
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Old Jan 10, 2004 | 09:46 AM
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There is a way to access the manual on-line at MBUSA, but I don't know the URL. Maybe someone will post it for you.

I'll parapharse the manual here. The knob on the right side of the controls is for air distribution. There are four pictograms spaced at 90 degrees around it. At the top is an up arrow. Turning the knob to that position will direct air to the windshield, side defroster, and rear passenger vents. On the lefts is a pictogram of two joined rectangles. In this position air goes the the dashboard center, side, and top (triangular) vents, and the rear passenger vents. Below the knob is a down arrow. In this position the air goes to the floor vents, rear footwell vents and the rear passenger vents.

The controls must be in the manual mode. That means the light on the Auto button must be off. The light on the EC or AC OFF buttom must be on. Set the knob at any position between the two rectangles clockwise to the down arrow to direct various amounts of air to the windshield vents. For the maximum amount of air to the windshield the knob should be set to the up arrow, obviously.

Now control the fan speed with the left knob.
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