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2016 E400 Air conditioning refuses to turn off

Old Apr 13, 2020 | 07:40 PM
  #1  
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E400
2016 E400 Air conditioning refuses to turn off

For some reason, I can not turn the A/C off by pressing the A/C button on the dash. It remains on no mater what, unless I turn the environmental controls completely off. (unrelated (?) The eco system never turns the engine off anymore) Vehicle is 1 month out of warranty with 42K miles. The last thing the dealer did was reprogram the car to reset the M-Brace account. I think it was called a GPS Epoch upgrade. Any one know what is causing this?

T.I.A.
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Old Apr 13, 2020 | 08:35 PM
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W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
Originally Posted by mandj
For some reason, I can not turn the A/C off by pressing the A/C button on the dash. It remains on no mater what, unless I turn the environmental controls completely off. (unrelated (?) The eco system never turns the engine off anymore) Vehicle is 1 month out of warranty with 42K miles. The last thing the dealer did was reprogram the car to reset the M-Brace account. I think it was called a GPS Epoch upgrade. Any one know what is causing this?

T.I.A.
Check your aux battery. When it's getting spotty, all sorts of electrical gremlins start manifesting. First place I'd look is at the battery, and a scanner might show slightly low voltages that can cause all of these weird sensor behaviors. The fact that the eco system isn't working is basically a huge indicator that it's a battery issue.
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Old Apr 22, 2020 | 05:41 PM
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Back from the dealer. Literally 3 weeks out of warranty and they tell me the environmental control have failed and the panel needs replaced. $950 dollars to shut the air off. I think not! LOL.
Anyone know if I buy a replacement panel from a scrap yard if it's plug and play?

Tired of all these "it ha$ to be programmed $$$" stories every time anything needs to be changed.

TIA
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Old Apr 22, 2020 | 07:49 PM
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While I'm not 100% positive I believe it is a simple plug and play. I had mine replaced a month or so ago and the SA had the old one in his hand, not much there.

Edit: How much did it cost for the diagnosis?
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Old Apr 22, 2020 | 10:26 PM
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W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
Originally Posted by mandj
Back from the dealer. Literally 3 weeks out of warranty and they tell me the environmental control have failed and the panel needs replaced. $950 dollars to shut the air off. I think not! LOL.
Anyone know if I buy a replacement panel from a scrap yard if it's plug and play?

Tired of all these "it ha$ to be programmed $$$" stories every time anything needs to be changed.

TIA
Tell them to **** off. Replace the aux battery and never use them again. That **** doesn't fail on W212s, they're dialing for dollars.
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Old Apr 22, 2020 | 10:28 PM
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W212 M276 DELA 30 ; W211 M113k, W126 M117, W126 OM617, W211 OM642 ; R107 M117 X2, Sierra 1500 LZ0
Originally Posted by mtnman82
While I'm not 100% positive I believe it is a simple plug and play. I had mine replaced a month or so ago and the SA had the old one in his hand, not much there.

Edit: How much did it cost for the diagnosis?
jesus are people just accepting that these electronics are failing so soon? This isn't an Audi or BMW. Your hvac panel is not failing, they're screwing you.
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Old Apr 23, 2020 | 02:36 AM
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The AUX battery is not the battery that causes the eco start/stop to stop shutting off the engine. This is caused by weak main battery. You need a new main battery.

This has been really common lately.
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Old Apr 23, 2020 | 01:59 PM
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Don't know if this is your issue:. https://mbworld.org/forums/c-class-w...start-car.html

I had the issue for two days - fan running crazy and I couldn't turn it off, I followed the ideas in that thread and it fixed it. Asked my SA on next visit, and he never heard of it.

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Old Apr 25, 2020 | 07:58 PM
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$190 for the Diagnosis.
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Old Apr 26, 2020 | 05:31 PM
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Originally Posted by DubVBenz
jesus are people just accepting that these electronics are failing so soon? This isn't an Audi or BMW. Your hvac panel is not failing, they're screwing you.
If it's not the panel, what is it? Both batteries were replaced last year and test fine.
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Old Apr 26, 2020 | 05:51 PM
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Originally Posted by mandj
Vehicle is 1 month out of warranty with 42K miles. Literally 3 weeks out of warranty and they tell me the environmental control have failed and the panel needs replaced. $190 for the Diagnosis.
If you have not already done so check with MBUSA to see if they will approve goodwill assistance 800-367-6372.
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