Odd A/C issue
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Odd A/C issue
My 07 E350 is acting a little odd. When i first start the car in this heat it takes a lot longer for the air to get cold, more than ever, but once its working its ice cold.. The other issue is that left side isn't coming out cold but not hot either.. I plugged in the computer and all the flapper doors are working normal. What is going on?
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Is your a 4-zone, or 2 zone system?
For reference, I am troubleshooting a 2008 with similar issues ( https://mbworld.org/forums/e-class-w...ling-used.html)
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Thanks for the video. Unfortunately i don't have a rest button. I found the problem which made no sense but the freon was low. I added about 10 oz. and fixed the problem. I did add a sealer since there must be a leak. Hope it seals. Thanks for all the help!!!!
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
On the button side, I do not have it either and why I advice to press the AUTO button instead. Do you have the AC control as this one:
That is the one I have been working with. Not certain why it is in this model since it seems is the standard for the W219 (CLS500/55). Perhaps because it is the Elegance model?
Anyways, if you press AUTO until the display changes, you can monitor several diagnostics as I posted in the separate thread.
NOTE: In the MB AC service manual, they are extremely emphatic about not using SEALANT in the AC system. For those dealers that do, they request to add a STAMP under the hood for the next service person to be aware of it, and they will not accept any dealer warranty claims on AC parts when sealant has been used.
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
If you do get into the hidden menu, I will deeply appreciate it if you log the registers from 00->10. As I mentioned before, I am working on an AC issue, and the register's value of a working AC system will be of great help.
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Hey Juanmor40, sorry for the late response. I haunt been home. I took the lazy way out and didn't connect the gauges to check the pressures. I just had a small gauge that just tells you if its low or too high and i just gave it about 8 oz of Freon and it works perfectly.
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
What kind of tools do you have to diagnose the vehicle? MB specific scanner? Laptop and willing to install MB specific software?
Guessing what the fault maybe is going to cost you $$, and some frustrations.
I am currently diagnosing a W211, and even though it seems not to cool well at times, I can get it to nearly freeze the cabin. You need to be able to read data from the computers, or gauges to properly diagnose it.
Would you mind posting a photo of the AC control unit on the dashboard? We (forum members) can then understand what system is in your vehicle (your VIN number would help as well)
Guessing what the fault maybe is going to cost you $$, and some frustrations.
I am currently diagnosing a W211, and even though it seems not to cool well at times, I can get it to nearly freeze the cabin. You need to be able to read data from the computers, or gauges to properly diagnose it.
Would you mind posting a photo of the AC control unit on the dashboard? We (forum members) can then understand what system is in your vehicle (your VIN number would help as well)
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Out Of Control!!
Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
heat against mildew!
My 07 E350 is acting a little odd. When i first start the car in this heat it takes a lot longer for the air to get cold, more than ever, but once its working its ice cold.. The other issue is that left side isn't coming out cold but not hot either.. I plugged in the computer and all the flapper doors are working normal. What is going on?
I would not be surprised to read something like...
after A/C shuts off HVAC cavity gets heated until AAC is satified with evap temp sensor and cabin moisture sensor located near the windshield rain sensor.
Once we've understood the above, we can cut the HVAC some slack for residual heat that was used for drying.
Last edited by CaliBenzDriver; Jul 30, 2022 at 01:39 AM.
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
, can you post the ACC module values when the car is warm, outside, and steady @2000rpm, maxcool setting and recycling ON?Looking for refrigerant pressure >12 bar, evaporator temp @5-9C, radiator electric fan speed @70%. If you also have AC pressure gauges, you should be looking for low side 30-45psi, and high side >180psi, but smaller than 225psi. Low side between 45 and 70 psi hints to trouble in suction side. If you can measure the low/high side before using g the AC would also help. If the system was off for a while, pressures should be identical
From VIN, and the photo it seems it is a 2-zone Tempmatic system which does not have the hidden menu
Last edited by JCM_MB; Jul 30, 2022 at 03:13 PM.
