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AC unit turns on by itself randomly

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Old 03-07-2020, 06:18 PM
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C300 Sport
AC unit turns on by itself randomly

My 2008 C300's AC unit randomly turns on by itself every 5-10 minutes or so. Any idea as to why this could be happening, and how it can be fixed?

Thanks!
Old 03-08-2020, 09:15 PM
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Old 03-12-2020, 02:46 PM
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2012 C300 4Matic
I don't know that you are actually having a problem. Do you have it in Auto mode? Or maybe Defrost? If so, the A/C could go on if moisture would need to be taken out of the air. That would be normal. Now if you would not have the climate control on at all and the A/C would then randomly come on, that would be a different story. What are teh circumstances when it comes on?
Old 03-13-2020, 09:06 AM
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Originally Posted by Alfadude
I don't know that you are actually having a problem. Do you have it in Auto mode? Or maybe Defrost? If so, the A/C could go on if moisture would need to be taken out of the air. That would be normal. Now if you would not have the climate control on at all and the A/C would then randomly come on, that would be a different story. What are teh circumstances when it comes on?
Thanks for the reply. Climate control (as far as I am aware) is completely off. As in, no lights are on in that entire panel. I'm not aware of any particular circumstances, other than the vehicle is being driven. Let me know what specifics you are thinking about.
Old 03-13-2020, 10:10 AM
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Does this happen every time you drive the car or just occasionally? So, you do not have the fans running to circulate air or the heat going while driving the car? The panel is always off and the A/C comes on? Then I have no clue. Sorry.
Old 03-13-2020, 10:21 AM
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Originally Posted by Alfadude
Does this happen every time you drive the car or just occasionally? So, you do not have the fans running to circulate air or the heat going while driving the car? The panel is always off and the A/C comes on? Then I have no clue. Sorry.
Correct, I generally leave them off, and this only happens while the climate control is off. It consistently happens when I drive the car every 5-10 minutes or so. Hopefully someone else on here has any other idea. This is very strange.

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