2015 E350 Auto Climate Problem
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Joined: Apr 2024
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E350 4Matic Wagon
2015 E350 Auto Climate Problem
Hi All:
New to the forum now that we have a new-to-us 2015 E350 4Matic Wagon! Love the car so far but driving the car home the other evening from the dealer (a long drive) I ran into what I think is an issue with the AUTO climate control.
I had it set to 70 degrees, all vents open, no zone activated, a/c on, ECO off, no windows or roof open, and the system was as expected for about 20-25 minutes after start and then suddenly it just started absolutely blasting heat and it wouldn't stop. I obviously tried turning the temp down, all the way to 60, no change whatsoever, until I turned it to LO and then it switched to full blast A/C. After about 30 minutes of back and forth I just gave up on it and turned it off.
I tried the AUTO again after stopping on the way and, same thing - fine for 20-25, then full on Hades.
I contacted the MB dealer, who tried to explain that "it's just a common thing with those models" and to just not use the AUTO function.
I find it pretty hard to believe this is "normal," even my Chevy Blazer in high school had AUTO climate that worked - am I wrong here? If not, is this a sensor that has gone bad and an easy fix?
Thanks in advance!
New to the forum now that we have a new-to-us 2015 E350 4Matic Wagon! Love the car so far but driving the car home the other evening from the dealer (a long drive) I ran into what I think is an issue with the AUTO climate control.
I had it set to 70 degrees, all vents open, no zone activated, a/c on, ECO off, no windows or roof open, and the system was as expected for about 20-25 minutes after start and then suddenly it just started absolutely blasting heat and it wouldn't stop. I obviously tried turning the temp down, all the way to 60, no change whatsoever, until I turned it to LO and then it switched to full blast A/C. After about 30 minutes of back and forth I just gave up on it and turned it off.
I tried the AUTO again after stopping on the way and, same thing - fine for 20-25, then full on Hades.
I contacted the MB dealer, who tried to explain that "it's just a common thing with those models" and to just not use the AUTO function.
I find it pretty hard to believe this is "normal," even my Chevy Blazer in high school had AUTO climate that worked - am I wrong here? If not, is this a sensor that has gone bad and an easy fix?
Thanks in advance!
Out Of Control!!
Joined: Apr 2019
Posts: 12,002
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Hi All:
New to the forum now that we have a new-to-us 2015 E350 4Matic Wagon! Love the car so far but driving the car home the other evening from the dealer (a long drive) I ran into what I think is an issue with the AUTO climate control.
I had it set to 70 degrees, all vents open, no zone activated, a/c on, ECO off, no windows or roof open, and the system was as expected for about 20-25 minutes after start and then suddenly it just started absolutely blasting heat and it wouldn't stop. I obviously tried turning the temp down, all the way to 60, no change whatsoever, until I turned it to LO and then it switched to full blast A/C. After about 30 minutes of back and forth I just gave up on it and turned it off.
I tried the AUTO again after stopping on the way and, same thing - fine for 20-25, then full on Hades.
I contacted the MB dealer, who tried to explain that "it's just a common thing with those models" and to just not use the AUTO function.
I find it pretty hard to believe this is "normal," even my Chevy Blazer in high school had AUTO climate that worked - am I wrong here? If not, is this a sensor that has gone bad and an easy fix?
Thanks in advance!
New to the forum now that we have a new-to-us 2015 E350 4Matic Wagon! Love the car so far but driving the car home the other evening from the dealer (a long drive) I ran into what I think is an issue with the AUTO climate control.
I had it set to 70 degrees, all vents open, no zone activated, a/c on, ECO off, no windows or roof open, and the system was as expected for about 20-25 minutes after start and then suddenly it just started absolutely blasting heat and it wouldn't stop. I obviously tried turning the temp down, all the way to 60, no change whatsoever, until I turned it to LO and then it switched to full blast A/C. After about 30 minutes of back and forth I just gave up on it and turned it off.
I tried the AUTO again after stopping on the way and, same thing - fine for 20-25, then full on Hades.
I contacted the MB dealer, who tried to explain that "it's just a common thing with those models" and to just not use the AUTO function.
I find it pretty hard to believe this is "normal," even my Chevy Blazer in high school had AUTO climate that worked - am I wrong here? If not, is this a sensor that has gone bad and an easy fix?
Thanks in advance!
It sounds like the defrost cycle is going wrong... like the coil sensor has peeled off.
Let's connect a "LAUNCH cReader Elite MB" or equivalent capable scanner to read data out of your AAC Module. See what happens when temps go wild on you.
Whatever you decide don't rush to overfill the refrigerant circuit. Scanner will read you pressure sensor...
🤞
Senior Member
Joined: Sep 2019
Posts: 266
Likes: 305
2011 Mercedes E350 4Matic Wagon
Hi All:
New to the forum now that we have a new-to-us 2015 E350 4Matic Wagon! Love the car so far but driving the car home the other evening from the dealer (a long drive) I ran into what I think is an issue with the AUTO climate control.
I had it set to 70 degrees, all vents open, no zone activated, a/c on, ECO off, no windows or roof open, and the system was as expected for about 20-25 minutes after start and then suddenly it just started absolutely blasting heat and it wouldn't stop. I obviously tried turning the temp down, all the way to 60, no change whatsoever, until I turned it to LO and then it switched to full blast A/C. After about 30 minutes of back and forth I just gave up on it and turned it off.
I tried the AUTO again after stopping on the way and, same thing - fine for 20-25, then full on Hades.
I contacted the MB dealer, who tried to explain that "it's just a common thing with those models" and to just not use the AUTO function.
I find it pretty hard to believe this is "normal," even my Chevy Blazer in high school had AUTO climate that worked - am I wrong here? If not, is this a sensor that has gone bad and an easy fix?
Thanks in advance!
New to the forum now that we have a new-to-us 2015 E350 4Matic Wagon! Love the car so far but driving the car home the other evening from the dealer (a long drive) I ran into what I think is an issue with the AUTO climate control.
I had it set to 70 degrees, all vents open, no zone activated, a/c on, ECO off, no windows or roof open, and the system was as expected for about 20-25 minutes after start and then suddenly it just started absolutely blasting heat and it wouldn't stop. I obviously tried turning the temp down, all the way to 60, no change whatsoever, until I turned it to LO and then it switched to full blast A/C. After about 30 minutes of back and forth I just gave up on it and turned it off.
I tried the AUTO again after stopping on the way and, same thing - fine for 20-25, then full on Hades.
I contacted the MB dealer, who tried to explain that "it's just a common thing with those models" and to just not use the AUTO function.
I find it pretty hard to believe this is "normal," even my Chevy Blazer in high school had AUTO climate that worked - am I wrong here? If not, is this a sensor that has gone bad and an easy fix?
Thanks in advance!
Out Of Control!!
Joined: Apr 2019
Posts: 12,002
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
warranty coverage rodeo
Do you have a limited warranty with the vehicle being as it is a recent used purchase? That is not "a common thing with those models"...that MB dealer is full of s**t. There is absolutely something wrong with your temp control system and it needs to be fixed by them under warranty so that it functions as it should. Bring it back to the selling dealer and go with them when they road test the vehicle because you stated it takes 20-25 mins for this problem to present itself.
We can tell there's an existing coverage in place because "everything is perfect" until the day when every expensive part will need work.
I would go ahead ASAP and pay the $200 diagnostics fee - It's free with repairs, right?
Due-diligence... you should scan the chassis with a good scanner or get good pros involved to check big ticket items tranny, 4Matic-toc, plugs/ cyl. scoring, CPS oil-in-harness...
Last edited by CaliBenzDriver; Apr 2, 2024 at 06:07 PM.
MBWorld Fanatic!
Joined: Dec 2011
Posts: 4,379
Likes: 952
W212 FL
There's definitely something wrong with your car and I don't believe that was common on Mercedes-Benz cars . Due to forum rules, I won't say anything furthermore on how stupid comment it was .I rarely use AUTO Mode in my car but it's because it just blows nothing but cold air when the sits under sun but that's too much to my comfort level . The reason behind is that fan speed is set to maximum to blow air , I just lower the fan speed but this time is turns off AUTO Mode .
I don't complain it's the way it works
I don't complain it's the way it works
Thread Starter
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Joined: Apr 2024
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E350 4Matic Wagon
Update:
It appears that a cabin temp sensor embedded in the overhead control panel (where the pano roof control is) shorted out and randomly shows -10C temps. Awaiting the dealer's response, as it's apparently a complete overhead control panel replacement and programming.
It appears that a cabin temp sensor embedded in the overhead control panel (where the pano roof control is) shorted out and randomly shows -10C temps. Awaiting the dealer's response, as it's apparently a complete overhead control panel replacement and programming.
Out Of Control!!
Joined: Apr 2019
Posts: 12,002
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
factory trained
Update:
It appears that a cabin temp sensor embedded in the overhead control panel (where the pano roof control is) shorted out and randomly shows -10C temps.
Awaiting the dealer's response, as it's apparently a complete overhead control panel replacement and programming.
It appears that a cabin temp sensor embedded in the overhead control panel (where the pano roof control is) shorted out and randomly shows -10C temps.
Awaiting the dealer's response, as it's apparently a complete overhead control panel replacement and programming.
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MBWorld Fanatic!
Joined: May 2018
Posts: 6,633
Likes: 6,575
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Update:
It appears that a cabin temp sensor embedded in the overhead control panel (where the pano roof control is) shorted out and randomly shows -10C temps. Awaiting the dealer's response, as it's apparently a complete overhead control panel replacement and programming.
It appears that a cabin temp sensor embedded in the overhead control panel (where the pano roof control is) shorted out and randomly shows -10C temps. Awaiting the dealer's response, as it's apparently a complete overhead control panel replacement and programming.
I wonder, how could a simple NTC/sensor can go bad quite fast ?
Communication glitch like I once had ? Or indeed the NTC/sensor went bad ?
How is yours Cali, is it still showing wrong temperature values too ?
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Out Of Control!!
Joined: Apr 2019
Posts: 12,002
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
LIN Temp sensor
It seems this sensor is the one often going banana...........
I wonder, how could a simple NTC/sensor can go bad quite fast ?
Communication glitch like I once had ? Or indeed the NTC/sensor went bad ?
How is yours Cali, is it still showing wrong temperature values too ?
I wonder, how could a simple NTC/sensor can go bad quite fast ?
Communication glitch like I once had ? Or indeed the NTC/sensor went bad ?
How is yours Cali, is it still showing wrong temperature values too ?
About OP... I don't think the dealer Xentry has issue reading OCP 70B1 sensor... so what else can it be: footwell GND post.
Despite what we read about wonderful LIN, I think it's very sensitive to poor GND reference. Its not differential like CAN-H/L. When the GND is noisy the link is broken. Default value is substituted.
A new module will appear to fix that by adapting to what the current GND level.
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Make sense Cali. Single Wire LIN far away and being an immigrant at the pano roof circuit board...LOL....away from actual N22/7 HVAC module.... so poor grounding does matter a great deal.
I think if the NTC/sensor is disconnected the default is not -10C, but more like -40C or so as I recalled.
I think if the NTC/sensor is disconnected the default is not -10C, but more like -40C or so as I recalled.
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From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Though for another class, and earlier generation the principles are similar
https://w220.wiki/Overhead_Control_Panel_(OCP)_(N70)
https://w220.wiki/Overhead_Control_Panel_(OCP)_(N70)
