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Should I be able to turn the A/C light off?

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Old May 18, 2014 | 02:52 PM
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2024 GLS450W4, 2016 S550 4MATIC (W222), 1972 350SL (R107), 2012 GLK350 (X204)
Should I be able to turn the A/C light off?

Question -
Should I be able to manually deactivate the AC compressor by pressing the AC light? Dealer says no - that it remains on 24/7 when the climate control system is on-- I thought the manual said you could manually deactivate the dehumidification piece by pressing the a/c button. I press it and nothing happens. If it is constantly engaged I know it automatically cycles the compressor as needed but I am just wanting to make sure my system isn't faulty - on my 2008 CLK I can turn it on and off. I suppose the service advisor at the stealership knows what he is talking about but then again they've been wrong before. I want to have it fixed under warranty if in fact it is not operating properly. I know I'm being **** because the system heats and cools perfectly fine.

On a positive note, I saw this in an older thread, I am having my MY 2011 wood replaced under warranty for the UV fading issue. So if anyone still has this issue dealers are still being helpful. He said it is a $3,500 repair (part is $2,900 which is crazy) here near Washington DC. Glad I had this checked out before warranty expiration.
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Old May 18, 2014 | 03:49 PM
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'11 E350BTC P2 Leather
push button, AC on, light on
push button, AC off, light off

cycle ad infinitum
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Old May 18, 2014 | 05:50 PM
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2024 GLS450W4, 2016 S550 4MATIC (W222), 1972 350SL (R107), 2012 GLK350 (X204)
Thank you - I thought this was the way it should work but it doesn't change with pressing the button. I guess I will have to discuss with another service advisor since the one who was helping me told me it was functioning normally and you could not manually turn it off when pressing AC.








Originally Posted by mikemargolis
push button, AC on, light on
push button, AC off, light off

cycle ad infinitum
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Old May 18, 2014 | 06:05 PM
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Stories like these remind me how much I can't stand dealer service. Why would a button with light be there if you couldn't turn it on and off.
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Old May 18, 2014 | 06:12 PM
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I said the same thing; it wouldn't have been manufacturer with a button if it didn't serve the purpose of an override- I realize it isn't the biggest deal if it is working properly but don't want it to become the forebearer of a larger problem with the system. Generally I don't have issues with this dealer, maybe they didn't feel like looking at it on a Saturday. I will have someone else check it out.


Originally Posted by thefisch
Stories like these remind me how much I can't stand dealer service. Why would a button with light be there if you couldn't turn it on and off.
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Old May 18, 2014 | 07:45 PM
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Originally Posted by frostsdad
...Should I be able to manually deactivate the AC compressor ....
When I push "OFF" everything goes off. Then if I press "AC" the "AUTO" lights up along with "AC". Then if I press "AC" the light goes out but "AUTO" stays lit.
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Old May 18, 2014 | 07:51 PM
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Originally Posted by frostsdad
I said the same thing; it wouldn't have been manufacturer with a button if it didn't serve the purpose of an override- I realize it isn't the biggest deal if it is working properly but don't want it to become the forebearer of a larger problem with the system. Generally I don't have issues with this dealer, maybe they didn't feel like looking at it on a Saturday. I will have someone else check it out.
For some dealers, Saturdays are oil change days. In your case they would likely have had to keep the car until Monday to get someone to look at it which means a two day loaner minimum for them. I would have respected them if they wanted to make an appointment to look at it during the week, but to dismiss your concern wastes more of your time. Plus with your impending warranty expiration, it would be on your dime if/when it turns out not to be 'normal'. It sounds like they are treating you right with the wood replacement. I would expect the same with this issue.
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Old May 19, 2014 | 10:37 AM
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2010 E350 Luxury Sedan, Engine 272 (V6)
More than just pushing AC button

This is for my 2010, but probably the same.
Push OFF button to turn off entire system. Then you have to push the manual switch for fan or mode. However, that turns AC back on. THEN you can push AC button to deactivate AC compressor and adjust fan or mode using those buttons.
However, heat will still come on if it gets cooler than the temperature setting.
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Old May 19, 2014 | 11:04 AM
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Originally Posted by frostsdad
I said the same thing; it wouldn't have been manufacturer with a button if it didn't serve the purpose of an override- I realize it isn't the biggest deal if it is working properly but don't want it to become the forebearer of a larger problem with the system. Generally I don't have issues with this dealer, maybe they didn't feel like looking at it on a Saturday. I will have someone else check it out.

I owned a 2011 model E350 for a year and definitely the AC light went out if I pressed the AC button. If the button was not meant to do this there would simply be no button, period.


Your SA at the dealer should be "coached" for as he denied service work for your car that gets paid by the MB. Instead of telling you the malfunctioning button behavior in normal he should have scheduled you for service work for this.


Good dealer by what you say but you may want to use another SA at this location.


I can 100% say to you that your AC button is not working correctly if it does not cycle the button light each time you press it.

Last edited by Arrie; May 20, 2014 at 01:11 PM.
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Old May 19, 2014 | 06:23 PM
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Thanks all - I remember that I was able to deactivate by pressing the button and it went out. All of a sudden that function stopped working. I haven't had the car that long - bought pre-owned so I thought maybe I was just confused.

The SA was terrific about the wood trim - so I will give him the benefit of the doubt that I wasn't explaining myself clearly (although I don't think it is complicated). I will take him to the controls and show him or ask another SA. Where I live there are multiple dealers so I have options if I can't get it fixed at the primary dealer.

Bigger question - is this possibly indicative of another issue? That's my bigger concern in all of this - that perhaps the control unit is going bad. If so I definitely want that replaced or fixed before I lose climate control functionality.
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