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

Is there any circumstance in which the air conditioner . . .

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Old Jul 30, 2002 | 11:07 AM
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Is there any circumstance in which the air conditioner . . .

. . . light goes off (and the air flow itself also stops) when in the auto mode? I could not find anything in the manual about the air conditioning shutting off when the desired temeperature is reached.


I mentioned a few days ago that muy air conditioner shut down three times while driving home one day. The service department thought it might be that the temp sensor is defective. However, I did not think the air ever actually is supposed to stop completely in the auto mode. Am I wrong?

CP
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Old Jul 30, 2002 | 11:29 AM
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I'm not sure about the AC on the coupe, but there is no "AC light" on the C320. Only the light for Recirc. If you press this, it should only stay on for 30 minutes (if I remember correctly from the manual). If you have it set on "auto", then the air flow would decrease as the cabin reached the set temperature. But it should not stop all together.
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Old Jul 30, 2002 | 11:36 AM
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could it be the Head unit?
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Old Jul 30, 2002 | 11:38 AM
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yeah if it is in "auto" mode once the cabin temp is reached the AC shuts off until the cabin temp reaches 2 degrees above the preset temp.
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Old Jul 30, 2002 | 12:14 PM
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Originally posted by TimmyC230boy
yeah if it is in "auto" mode once the cabin temp is reached the AC shuts off until the cabin temp reaches 2 degrees above the preset temp.
Sorry, but what are you talking about? The A/C never "shuts off" by itself. The C230/240 system only shuts off when you turn the fan speed knob to the "zero" position. When the temperature in the cabin reaches the desired setting, the fan and air temperature are moderated to maintain the setting. As the temperature lowers or raises, the fan and/or air temp are modified to maintain the setting.

Chrono, when you say your A/C stops, do you mean the "auto" light goes out and the fan stops completely? Or is it like you manually pressed "auto" to go into manual mode and the system is using the current knob positions? If your fan speed knob is currently set low (it doesn't matter in auto), you might want to set it higher so if the auto light goes out again, you can know if the fan is still running. Do you get what I mean?
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Old Jul 30, 2002 | 12:28 PM
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Originally posted by MarkL

Sorry, but what are you talking about? The A/C never "shuts off" by itself. The C230/240 system only shuts off when you turn the fan speed knob to the "zero" position.
ChronoPassion has a C230, not a C240/320. Mine works like this all the time, once the temp is reaches the AC is dramatically reduced, down to the lowest level possible, sometimes you can't tell it isnt still until you put your hand in front of a vent.
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Old Jul 30, 2002 | 01:07 PM
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Originally posted by TimmyC230boy


ChronoPassion has a C230, not a C240/320. Mine works like this all the time, once the temp is reaches the AC is dramatically reduced, down to the lowest level possible, sometimes you can't tell it isnt still until you put your hand in front of a vent.
Re-read the post. MarkL is correct. The light should not go out.

Chrono is saying his light goes out: "light goes off (and the air flow itself also stops) when in the auto mode".

I've never seen the "Auto" light go out by itself. Once the temperature is reached, the fan slows down and the output temperature is moderated as MarkL said.

BTW: I've found that Auto can still be used even if the fan knob is at zero. Just press the Auto button again and it'll kick on. Weird....

Last edited by avlis; Jul 30, 2002 at 01:11 PM.
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Old Jul 30, 2002 | 01:25 PM
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my bad guy's. misread post, yeah that does seemweird. I'm still trying to get over last night with girlfriend..... wink wink
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Old Jul 30, 2002 | 01:34 PM
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Originally posted by TimmyC230boy
my bad guy's. misread post, yeah that does seemweird. I'm still trying to get over last night with girlfriend..... wink wink
Yeah right!
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Old Jul 30, 2002 | 02:01 PM
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From: Sitting behind thing freakin desk of mine. Dreaming I was playing my Taylors, and driving my Benz. Long Live The VRAA!!!!!!
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of course last night didnt end till this morning. it was great we stayed up and talked and stuff, and watched movies and stuff, did I mention we did other stuff. lol
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Old Jul 30, 2002 | 02:09 PM
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Originally posted by avlis

BTW: I've found that Auto can still be used even if the fan knob is at zero. Just press the Auto button again and it'll kick on. Weird....
this is because auto works independently of fan speed control. auto adjusts the fan speed (like you said) according to the temperature sensor.
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Old Jul 30, 2002 | 02:37 PM
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Thanks for the help guys. I have an appointment next week to take the car in for this "problem".

As I mentioned (to be clear) both the auto light turns off and the air completely stops abruptly. So, I do not think it is a temperature sensor since the auto air should still be running regardless (at whatever low level) and the light should not ever turn off, as far as I can tell.

Thanks,

CP
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Old Jul 30, 2002 | 02:59 PM
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I seem to recall reading about this in the user manual, or somewhere in the forums....
From what I remember it's a safety measure. It shuts down if there's low coolant (whatever that ozone-friendly stuff is..).

Don't quote me on that though.
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Old Jul 30, 2002 | 03:07 PM
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Auto or Manual Climate Control

I have the standard A/C controls in my coupe.. it's the most confusing set of controls in any car that I've owned. My friend's BMW's A/C controls are just as confusing. (and I am an engineer)

......But the A/C sure does a dxxn good job in keeping me coool.
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Old Jul 30, 2002 | 03:21 PM
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i keep my a/c in manual mode all the time. that auto sh#t just doesnt cut it when i want a constant stream of cold air in my face...... i find manual to be much easier
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Old Jul 30, 2002 | 04:26 PM
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Re: Auto or Manual Climate Control

Originally posted by Jerry MB230K
I have the standard A/C controls in my coupe.. it's the most confusing set of controls in any car that I've owned. My friend's BMW's A/C controls are just as confusing. (and I am an engineer)

......But the A/C sure does a dxxn good job in keeping me coool.
Man, you and Tommy ! What gives? I think it's pretty intuitive. Two temp knobs for driver and passenger. One knob for air direction, one knob for fan speed. Hmmm. "Auto" controls both. In manual, both knobs become "activated" and do what they're set for. Then, the extra "ECON" button to control the compressor. I don't know how it could be much simpler unless they didn't let you control the thing manually. Do you like the type where you keep pressing "mode" to get to the vent selection you like? And the type of fan control, like on the C320, where you have to keep pressing it over and over until it gets where you want? IMO, the knobs actually make it easier to get what you want quickly.

I agree w/ you about the cooling capacity -- it's been working great here on the 97-100 degree days. Takes 3-4 minutes to cool down and keeps on going.
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Old Jul 30, 2002 | 04:36 PM
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Manual vs. Auto

In manual or auto, the A/C works to get to the desired temperature you set with the manual knob. In auto, the air gets deflected to the windshield, your face or your feet , trying to keep each of these cooled to the temperature you set with the knob.
In manual, you set where you want the air to blow.
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Old Jul 30, 2002 | 05:08 PM
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doesnt cut it when i want a constant stream of cold air in my face
My complaint is the opposite: too much cold air in the face and NONE on the floor in Auto. Ever notice how hot the firewall gets during city driving? I leave the manual knob set to "floor" and pop the Auto off, every now and then, when my legs get too hot.
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Old Jul 30, 2002 | 05:18 PM
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Maybe it's different in the C320 (I know we have a different unit), but we can have the fan on auto and still control the vent selection. I nomally manually choose the vent so that I am getting the amount of air that I want blowing towards my face.

The auto fan cools off the car very fast, and keeps it at a comfortable temp.

MarkL, maybe the knob is a little quicker for changing the fan speed, but I don't have any complaints about using the button. Of course, I use automatic most of the time, so I rarely have to use the button.
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Old Jul 30, 2002 | 07:44 PM
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Originally posted by revstriker
Maybe it's different in the C320 (I know we have a different unit), but we can have the fan on auto and still control the vent selection. I nomally manually choose the vent so that I am getting the amount of air that I want blowing towards my face.

The auto fan cools off the car very fast, and keeps it at a comfortable temp.

MarkL, maybe the knob is a little quicker for changing the fan speed, but I don't have any complaints about using the button. Of course, I use automatic most of the time, so I rarely have to use the button.
Rev, that's the one thing my C240 doesn't allow and I wish it would (independent manual control of fan and air direction). I normally leave it in "auto" since I think it does the best job when left alone. The only time I go to manual is when I engage "ECON" to just get outside air w/ windows open. I go into manual to avoid having the fan kick up trying to cool the car. The nice thing about being able to leave the air direction in auto is that the car will do "creative" things for more comfort, like, sending some air through the defrost vents to provide more indirect cooling in moderate temps.
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