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AC blower fan turns down when putting car in reverse?

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AC blower fan turns down when putting car in reverse?

 
Old 08-01-2009, 06:44 PM
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AC blower fan turns down when putting car in reverse?

Hi all,

I have a question and have not seen it addressed in the manual.

When I put my car in reverse and back out of a parking spot, is it normal for my AC fan to turn on low? When I put it in drive it is at full speed again. It does not happen everytime but anyway I want to know if it is normal or a problem with my car.
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Old 08-01-2009, 06:47 PM
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Sounds odd. I notice sometimes my a/c fan fluctuates a little in speed at its leisure...never bothered to get it looked at.
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Old 08-02-2009, 10:16 AM
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Mine does the same, when on automatic mode. Reverse it slows down and once in drive it goes back up.
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Old 08-02-2009, 11:50 AM
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Originally Posted by Kraut783 View Post
Mine does the same, when on automatic mode. Reverse it slows down and once in drive it goes back up.
stab in the dark guess -- but I bet its so that you can hear the reverse parktronic beeping sounds better if you had that option... but even though we don't - it does it anyway... Or maybe to hear the kid screaming that your about to run over? ;-)

- Eric
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Old 08-02-2009, 03:59 PM
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Originally Posted by dalazernet View Post
stab in the dark guess -- but I bet its so that you can hear the reverse parktronic beeping sounds better if you had that option... but even though we don't - it does it anyway... Or maybe to hear the kid screaming that your about to run over? ;-)

- Eric
My guess is that they had both in mind when they put that feature in our cars (yes, mine does it too), but they'll only admit making it easier for the driver to hear the parktronic beeping.
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Old 08-02-2009, 05:09 PM
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Mine does it too.
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Old 08-26-2009, 08:23 PM
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these pics are from the screen showing the malfunction... Anyone happen to know what could be the problem or how to fix it???
Attached Thumbnails AC blower fan turns down when putting car in reverse?-1.jpg   AC blower fan turns down when putting car in reverse?-2.jpg  
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Old 08-27-2009, 11:56 AM
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mine does it
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Old 08-27-2009, 12:48 PM
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This has been standard in many European cars, like my ex Audi A4 for years. It's meant to prevent the exhaust fumes to be sucked into the car while reversing. It's actually explained in the car's manual, atleast in the Audi. Haven't received my MB yet, so can't comment on the MB manual yet.

In the A4 the AC also turned down when using the windshield washer. Again to prevent the fumes to be sucked in.

Last edited by FinnMB; 08-27-2009 at 12:51 PM.
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Old 08-27-2009, 12:50 PM
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Never noticed that will have to keep it in mind. To the OP with those screen shots I would have it looked at during the next service.
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Old 08-28-2009, 07:17 PM
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External fan?

Originally Posted by giovapal View Post
these pics are from the screen showing the malfunction... Anyone happen to know what could be the problem or how to fix it???
The only external fan is the one behind the radiator, not the fan in the heating system. And, that could be a stored code from some past event.
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