A/C needs a charge at 72k? I hope.....other small issues
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05 E350
A/C needs a charge at 72k? I hope.....other small issues
Putting aside the fact that I can't figure out how the hell the windshield defroster refuses to blow anything but 90 degree air (before today, all the time), the A/C decided to stop blowing cold air on the hottest day of the year. I drove it this morning, all was good and then all of the sudden tonight I don't have "hot" air blowing but it damn sure isn't cold either. Is this about when you would expect the system to need charging? Oh and also the outside air temperature sensor went up it looks like, went from -- past few days to negative 40 today. So looks like I need to replace that too but doesn't seem to be a big deal from what I read.
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W212 MY'14 M276-3.5NA @75kMi
bad temp sensor?!
Putting aside the fact that I can't figure out how the hell the windshield defroster refuses to blow anything but 90 degree air (before today, all the time), the A/C decided to stop blowing cold air on the hottest day of the year. I drove it this morning, all was good and then all of the sudden tonight I don't have "hot" air blowing but it damn sure isn't cold either. Is this about when you would expect the system to need charging? Oh and also the outside air temperature sensor went up it looks like, went from -- past few days to negative 40 today. So looks like I need to replace that too but doesn't seem to be a big deal from what I read.
You know already the HVAC Controller read one of the temps sensor as Canadian winter so it's not giving you extra cooling.
Scan you car figure what lies temp sensors are telling the controller. Leave the refrigerant circuit alone for now.
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05 E350
You are well on you way to have this figured out. Do not jump to over charging your A/C!
You know already the HVAC Controller read one of the temps sensor as Canadian winter so it's not giving you extra cooling.
Scan you car figure what lies temp sensors are telling the controller. Leave the refrigerant circuit alone for now.
You know already the HVAC Controller read one of the temps sensor as Canadian winter so it's not giving you extra cooling.
Scan you car figure what lies temp sensors are telling the controller. Leave the refrigerant circuit alone for now.
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Last edited by CaliBenzDriver; Aug 4, 2022 at 08:54 PM.
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05 E350
Interesting! I am looking up info on it now. But wouldn't it have been fixed a year and a half ago when the vehicles were affected, assuming mine was one? IDK thanks either way.
Edit - Looks like they have to scan it to find out, was hoping could enter VIN but that doesn't look like the case. At least if that isn't it they can tell me what it is while I'm there I guess.
Edit - Looks like they have to scan it to find out, was hoping could enter VIN but that doesn't look like the case. At least if that isn't it they can tell me what it is while I'm there I guess.
Last edited by bigslick7878; Aug 4, 2022 at 09:28 PM.
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campaign fixes
Interesting! I am looking up info on it now. But wouldn't it have been fixed a year and a half ago when the vehicles were affected, assuming mine was one? IDK thanks either way.
Edit - Looks like they have to scan it to find out, was hoping could enter VIN but that doesn't look like the case. At least if that isn't it they can tell me what it is while I'm there I guess.
Edit - Looks like they have to scan it to find out, was hoping could enter VIN but that doesn't look like the case. At least if that isn't it they can tell me what it is while I'm there I guess.
Outside recalls, campaigns are voluntary actions based on many factors.
It's good to be knowledgeable about topics of interest and bring up printouts to the service writer's attention.
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05 E350
So we have a check engine light now to go along with no A/C. Car is running fine.
Question.....if I go to the stealer how much will they charge me to read the codes? I obviously will not be getting anything fixed there, but I am guessing there will be a charge. I was thinking go there so they can tell me any issues, then take it to other place to get the actual work done knowing exactly what the issues are?
Question.....if I go to the stealer how much will they charge me to read the codes? I obviously will not be getting anything fixed there, but I am guessing there will be a charge. I was thinking go there so they can tell me any issues, then take it to other place to get the actual work done knowing exactly what the issues are?
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W212 MY'14 M276-3.5NA @75kMi
not around circles...
So we have a check engine light now to go along with no A/C. Car is running fine.
Question.....if I go to the stealer how much will they charge me to read the codes? I obviously will not be getting anything fixed there, but I am guessing there will be a charge. I was thinking go there so they can tell me any issues, then take it to other place to get the actual work done knowing exactly what the issues are?
Question.....if I go to the stealer how much will they charge me to read the codes? I obviously will not be getting anything fixed there, but I am guessing there will be a charge. I was thinking go there so they can tell me any issues, then take it to other place to get the actual work done knowing exactly what the issues are?
Save your time!
Go directly to the place that you know will fix your car right the 1st time... hopefully not AutoZone
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2017 S550e
So we have a check engine light now to go along with no A/C. Car is running fine.
Question.....if I go to the stealer how much will they charge me to read the codes? I obviously will not be getting anything fixed there, but I am guessing there will be a charge. I was thinking go there so they can tell me any issues, then take it to other place to get the actual work done knowing exactly what the issues are?
Question.....if I go to the stealer how much will they charge me to read the codes? I obviously will not be getting anything fixed there, but I am guessing there will be a charge. I was thinking go there so they can tell me any issues, then take it to other place to get the actual work done knowing exactly what the issues are?
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05 E350
I just had a similar issue that I'm still trying to resolve. Some of this info might help though. I went to the dealer and they charged me $230 just to diagnose. That recall did not help me unfortunately. What your issue sounds like to me is that your freon is leaking somewhere. Engine light comes on when you have low or no freon. Is your compressor turning on at least?
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2017 S550e
Yeah forget that I'm not paying 230 for them to scan the codes. Anywhere can do that.. But that is very interesting what you said about the engine light and the freon. It is parked usually in a place where I would not be able to tell if anything was leaking. The check engine light was right behind the a/c not working so that could definitely be related. Didn't realize it would come on for that. I haven't listened for the compressor coming on I'm going to have to do that tomorrow. But thanks for the info.
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disabled by low power...
this sounds like the low power fault causes the software to disable A/C compressor even past the battery full status.
Simply reset the fault to let A/C resume operation: bingo, scanner payed for itself & saved time.
Simply reset the fault to let A/C resume operation: bingo, scanner payed for itself & saved time.
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2017 S550e
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W212 MY'14 M276-3.5NA @75kMi
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2017 S550e
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W212 MY'14 M276-3.5NA @75kMi
GOOD or RUSH....
Then you move to next step ...
You now have yourself a confirmed fault.
Not just hunting a glitch
FAULT:
This reportedly looks like low voltage is forcing the electric compressor to remain disabled.
Forward :
From this stage, I am guessing your next best shot is to measure voltage with engine idling and eye ball the display while driving for Amps + Volts.
What sort of driving do you do:
long or shortfrequent, unfrequent
How old is the battery ?
Pls take a picture of the battery top, in particular the (-) post
BYPASS ... RUSH TEMP. FIX:
I know you want summer A/C ASAP... try to float the system battery with a CTEK to see if complete joy and satisfaction are resumed.
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2017 S550e
Nice !
Then you move to next step ...
You now have yourself a confirmed fault.
Not just hunting a glitch
FAULT:
This reportedly looks like low voltage is forcing the electric compressor to remain disabled.
Forward :
From this stage, I am guessing your next best shot is to measure voltage with engine idling and eye ball the display while driving for Amps + Volts.
What sort of driving do you do:
long or shortfrequent, unfrequent
How old is the battery ?
Pls take a picture of the battery top, in particular the (-) post
BYPASS ... RUSH TEMP. FIX:
I know you want summer A/C ASAP... try to float the system battery with a CTEK to see if complete joy and satisfaction are resumed.
Then you move to next step ...
You now have yourself a confirmed fault.
Not just hunting a glitch
FAULT:
This reportedly looks like low voltage is forcing the electric compressor to remain disabled.
Forward :
From this stage, I am guessing your next best shot is to measure voltage with engine idling and eye ball the display while driving for Amps + Volts.
What sort of driving do you do:
long or shortfrequent, unfrequent
How old is the battery ?
Pls take a picture of the battery top, in particular the (-) post
BYPASS ... RUSH TEMP. FIX:
I know you want summer A/C ASAP... try to float the system battery with a CTEK to see if complete joy and satisfaction are resumed.
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W212 MY'14 M276-3.5NA @75kMi
moving along fine...
Thank you for your response. I am really convinced that its an electrical issue. I work from home and only really drive to the gym and a bite to eat everyday, so short frequent. On the weekends I might take longer drives.
We've charged the battery to 100% but would need to get that picture for you to see how old it is.
My next step is to jump the electrical compressor and see if it turns on.
Do you think the auxiliary battery has any play in this?
Haven't checked that.
We've charged the battery to 100% but would need to get that picture for you to see how old it is.
My next step is to jump the electrical compressor and see if it turns on.
Do you think the auxiliary battery has any play in this?
Haven't checked that.
frequent short trips
battery floated to full
longer weekend trips
JUMP or NOT:
We already know the controller is not allowing heavy loads. Is the system weak to supply 90Amps or the compressor overloading ?
Compressor
Why compressor is not getting powered.
(What's jumping compressor gonna do when nothing else knows A/C is running (engine Fan, blower etc) ? -- I answered that question and reconsidered that testing it is 👍
NEXT STEP:
We got to figure what's causing this fault. Does your tool expose the "fault setting criteria" (Xentry does)?
This really is not a classic A/C issue... NOP!
it is a modern Benz power management fault.
I am recommending you go ahead and not skip over power checks indicated in prior msg.
++++ Edit ++++
Is electric compressor jammed??
Test what DC current load
Anyway you can spin it manually?
Last edited by CaliBenzDriver; Aug 16, 2022 at 04:59 PM. Reason: bad compressor... stuck??
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2017 S550e
Recap:
frequent short trips
battery floated to full
longer weekend trips
JUMP or NOT:
I don't recommend you simply jump power to your compressor. We already know the controller is not allowing heavy loads.
Compressor is not known bad or is it ??? needs testing
That's why compressor is not getting powered. What's jumping compressor gonna do when nothing else knows A/C is running (engine Fan, blower etc) ?
NEXT STEP:
We got to figure what's causing this fault. Does your tool expose the "fault setting criteria" (Xentry does)?
This really is not a classic A/C issue... NOP!
it is a modern Benz power management fault.
I am recommending you go ahead and not skip over power checks indicated in prior msg.
++++ Edit ++++
Is electric compressor jammed??
Test what DC current load
Anyway you can spin it manually?
frequent short trips
battery floated to full
longer weekend trips
JUMP or NOT:
Compressor is not known bad or is it ??? needs testing
That's why compressor is not getting powered. What's jumping compressor gonna do when nothing else knows A/C is running (engine Fan, blower etc) ?
NEXT STEP:
We got to figure what's causing this fault. Does your tool expose the "fault setting criteria" (Xentry does)?
This really is not a classic A/C issue... NOP!
it is a modern Benz power management fault.
I am recommending you go ahead and not skip over power checks indicated in prior msg.
++++ Edit ++++
Is electric compressor jammed??
Test what DC current load
Anyway you can spin it manually?
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
forward....
You want to measure the load while pumping in a SHORT test.
We're trying to figure if compressor current is off chart or if power supply is faulty or both
You'll need a "DC-Clamp meter" to measure load.
BEWARE:
-- I am not sure what sort of DC power compressor uses
-- I wouldn't be surprised to see an 3-Phase aproximated AC motor.
Don't jump that to +12VDC!
Wiring will tell you DC vs. AC (picture !)
Last edited by CaliBenzDriver; Aug 16, 2022 at 05:09 PM.
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2017 S550e
Yes, at first I didn't think compressor was overloading supply and powering it would solve anything. Then i thought let's see the load...
You want to measure the load while pumping in a SHORT test.
We're trying to figure if compressor current is off chart or if power supply is faulty or both
You'll need a "DC-Clamp meter" to measure load.
BEWARE:
-- I am not sure what sort of DC power compressor uses
-- I wouldn't be surprised to see an 3-Phase aproximated AC motor.
Don't jump that to +12VDC!
Wiring will tell you DC vs. AC (picture !)
You want to measure the load while pumping in a SHORT test.
We're trying to figure if compressor current is off chart or if power supply is faulty or both
You'll need a "DC-Clamp meter" to measure load.
BEWARE:
-- I am not sure what sort of DC power compressor uses
-- I wouldn't be surprised to see an 3-Phase aproximated AC motor.
Don't jump that to +12VDC!
Wiring will tell you DC vs. AC (picture !)
Out Of Control!!
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Posts: 11,993
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
AUX not in the mix...
AUX supplies security when Main is not available. It has a really easy life doing not much.
On the fence:
We have to figure this question about overload:
- Car power supply is too weak
- A/C load is genuinely out of specs
Which is it
See Xentry's "fault criteria setting"
--> see previous posts for tests.
Last edited by CaliBenzDriver; Aug 16, 2022 at 06:36 PM.
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05 E350
So the wiring for the temp sensor was eaten by rodents (love that city life), That was fixed, new sensor installed......check engine light gone.......no other codes at all.....A/C still doesn't work.
. They tried everything but still nothing. They said the dealer might have to reset/reflash the computer or something? SMH.
. They tried everything but still nothing. They said the dealer might have to reset/reflash the computer or something? SMH.
