E350 AC Issues
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Newbie
Joined: Jan 2019
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E350
E350 AC Issues
I'm having issues with the AC. I took the car to the dealer to have a software update done hoping it would fix the problem. I have a few issues.
1. When I press the AC button to turn the AC off and just blow regular air, it does not turn off. The only way the AC turns off is when I turn the system off all together.
2. When we drive the car for a bout 2 hours the AC stops working. No air is blowing but it sounds like the air is blowing but nothing. I turn it off a few minutes and turn back on and it works for maybe 5 to 10 minutes and have to do it again.
Other then that, the car is GREAT!! It only has 84K miles on it. If you have had this same issue, please let me know what fixed the problem. My family is wanting me to trade the car, but I LOVE it!! The last benz I had was the same year and was an E350 and didn't have this issue...
HELP!!
Scarlett
1. When I press the AC button to turn the AC off and just blow regular air, it does not turn off. The only way the AC turns off is when I turn the system off all together.
2. When we drive the car for a bout 2 hours the AC stops working. No air is blowing but it sounds like the air is blowing but nothing. I turn it off a few minutes and turn back on and it works for maybe 5 to 10 minutes and have to do it again.
Other then that, the car is GREAT!! It only has 84K miles on it. If you have had this same issue, please let me know what fixed the problem. My family is wanting me to trade the car, but I LOVE it!! The last benz I had was the same year and was an E350 and didn't have this issue...
HELP!!
Scarlett
Out Of Control!!
Joined: Apr 2019
Posts: 12,139
Likes: 6,877
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
DIRTY AIR FILTRATION
I'm having issues with the AC. I took the car to the dealer to have a software update done hoping it would fix the problem. I have a few issues.
1. When I press the AC button to turn the AC off and just blow regular air, it does not turn off. The only way the AC turns off is when I turn the system off all together.
2. When we drive the car for a bout 2 hours the AC stops working. No air is blowing but it sounds like the air is blowing but nothing. I turn it off a few minutes and turn back on and it works for maybe 5 to 10 minutes and have to do it again.
Other then that, the car is GREAT!! It only has 84K miles on it. If you have had this same issue, please let me know what fixed the problem. My family is wanting me to trade the car, but I LOVE it!! The last benz I had was the same year and was an E350 and didn't have this issue...
HELP!!
Scarlett
1. When I press the AC button to turn the AC off and just blow regular air, it does not turn off. The only way the AC turns off is when I turn the system off all together.
2. When we drive the car for a bout 2 hours the AC stops working. No air is blowing but it sounds like the air is blowing but nothing. I turn it off a few minutes and turn back on and it works for maybe 5 to 10 minutes and have to do it again.
Other then that, the car is GREAT!! It only has 84K miles on it. If you have had this same issue, please let me know what fixed the problem. My family is wanting me to trade the car, but I LOVE it!! The last benz I had was the same year and was an E350 and didn't have this issue...
HELP!!
Scarlett
Your No2 is coil freezing up because of limited air circulation.
Simply replace $10 cabin filter or remove it for the time being.
You don't need to get you entire A/C system components replaced one by one or trade in your excellent car. It needs timely maintenance for each systems.
In the maintenance Dept: replace engine oil at 5000Mi. not when the display says it's service time.
Last edited by CaliBenzDriver; Oct 4, 2024 at 02:57 PM.
Member
Joined: Sep 2023
Posts: 196
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S212 E300
Interesting, I recognise number 2, the AC blocking up after ~2 hours of driving, depending on weather conditions. If I switch of the AC compressor (the AC button unlit) and leave the interior fans running for ~10 minutes, it seems the coil has ample time to de-ice. If I switch the AC compressor back on, it will happily cool the car for another 2 hours. Oh, and I've very recently replaced my interior filter and there is plenty of air circulation.
I've checked the temperature of the evaporator with my launch tool several times when this occurs. I can't find a temperature reading below zero, even though the system acts like a frozen evaporator. From some forum posts, this situation might happen when your system is low on coolant in the AC system. I've not yet tried to refill the system to check if this cures the issue.
I've checked the temperature of the evaporator with my launch tool several times when this occurs. I can't find a temperature reading below zero, even though the system acts like a frozen evaporator. From some forum posts, this situation might happen when your system is low on coolant in the AC system. I've not yet tried to refill the system to check if this cures the issue.
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Joined: May 2012
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From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
You might check the evaporator drain line to insure its working fine, you can also buy a can of evaporator cleaner. Mine had a similar problem and I did both at the same time so don't know exactly which one solved it, but the cleaner cleaned out the drain tube. I did not have a musty smell yet when I cleaned it. Also, I should ask, do you run it set to LO and use a low fan speed? Or on RECIRC continuously?
Last edited by pierrejoliat; Oct 6, 2024 at 06:58 PM.
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From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
Interesting, I recognise number 2, the AC blocking up after ~2 hours of driving, depending on weather conditions. If I switch of the AC compressor (the AC button unlit) and leave the interior fans running for ~10 minutes, it seems the coil has ample time to de-ice. If I switch the AC compressor back on, it will happily cool the car for another 2 hours. Oh, and I've very recently replaced my interior filter and there is plenty of air circulation.
I've checked the temperature of the evaporator with my launch tool several times when this occurs. I can't find a temperature reading below zero, even though the system acts like a frozen evaporator. From some forum posts, this situation might happen when your system is low on coolant in the AC system. I've not yet tried to refill the system to check if this cures the issue.
I've checked the temperature of the evaporator with my launch tool several times when this occurs. I can't find a temperature reading below zero, even though the system acts like a frozen evaporator. From some forum posts, this situation might happen when your system is low on coolant in the AC system. I've not yet tried to refill the system to check if this cures the issue.
If the evaporator temperature does not reach freezing point, it cannot be frozen evaporator issue.
Thread Starter
Newbie
Joined: Jan 2019
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E350
Thank you all for the responses. I will see what my team at the shop can try. Besides the AC issue, I can't actually turn the AC off when I press the AC button. Someone responded that is a factory thing and is normal. But if I turn the AC completely off, I don't have fan to circulate the air. If I could do that, then maybe the unit would unfreeze and I would still have the fan to blow the air, if it it is hot and not the AC. Any fix on the AC button being able to be turned off so just the fan is running if the AC freezes up??
Thanks!
Thanks!
Out Of Control!!
Joined: Apr 2019
Posts: 12,139
Likes: 6,877
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
LOOKUP AAC Module...
you can always hook up your favorite scanner to watch AAC Module datastream and DTC's
In particular see that ALL temp sensor are connected + working. Pass. footwell tends to get pulled apart during filter service
Unit keeps A/C : ON to please the windshield moisture sensor... this helps to dry the evap without foging up...
This should help restore confidence in this system.
In particular see that ALL temp sensor are connected + working. Pass. footwell tends to get pulled apart during filter service
Unit keeps A/C : ON to please the windshield moisture sensor... this helps to dry the evap without foging up...
This should help restore confidence in this system.
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MBWorld Fanatic!
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
The button A/C = aircond compressor only.
OFF = All off, including blower.
So you can press A/C to be off and still get blower to run
OFF = All off, including blower.
So you can press A/C to be off and still get blower to run
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MBWorld Fanatic!
Joined: May 2012
Posts: 2,363
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From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
Thank you all for the responses. I will see what my team at the shop can try. Besides the AC issue, I can't actually turn the AC off when I press the AC button. Someone responded that is a factory thing and is normal. But if I turn the AC completely off, I don't have fan to circulate the air. If I could do that, then maybe the unit would unfreeze and I would still have the fan to blow the air, if it it is hot and not the AC. Any fix on the AC button being able to be turned off so just the fan is running if the AC freezes up??
Thanks!
Thanks!
Last edited by pierrejoliat; Oct 9, 2024 at 10:01 AM.
Member
Joined: Sep 2023
Posts: 196
Likes: 76
S212 E300
Did some checks on my system, where I occasionally run into the same issue of the AC slowly blocking up after ~2 hours. I checked for the obvious water underneath the car after running the AC 100% for a few minutes. There's a nice puddle of water underneath the car, so the drains must be open. So there will be other causes for the AC to block up.
What do you mean by 'I can't actually turn the AC off when I press the AC button'. Does the red light above the A/C letters stay on?
What do you mean by 'I can't actually turn the AC off when I press the AC button'. Does the red light above the A/C letters stay on?
Thread Starter
Newbie
Joined: Jan 2019
Posts: 8
Likes: 0
E350
Did some checks on my system, where I occasionally run into the same issue of the AC slowly blocking up after ~2 hours. I checked for the obvious water underneath the car after running the AC 100% for a few minutes. There's a nice puddle of water underneath the car, so the drains must be open. So there will be other causes for the AC to block up.
What do you mean by 'I can't actually turn the AC off when I press the AC button'. Does the red light above the A/C letters stay on?
What do you mean by 'I can't actually turn the AC off when I press the AC button'. Does the red light above the A/C letters stay on?
