E-Class (W214) 2024 -

E350 vs E450 AC Compressor

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Old Oct 7, 2024 | 05:03 PM
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2024 E350 4MATIC SEDAN. 2021 AMG GLA35
E350 vs E450 AC Compressor

That should have been the title of my post but I messed up and entered my name instead! Put it down to old age!
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Old Oct 7, 2024 | 09:48 PM
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I replied in the other thread first but I'll reply the same here.

I believe you are thinking of this post comparing the E350 and E450. I've driven both and put over 6K miles on the E350 and can confirm that the AC compressor does not operate when the engine cuts off when start/stop mode is on. If it's not off for very long or not very hot outside it's not that noticeable but if you have the AC on high because it's hot, its noticeable. The E450 drives the AC compressor off the electric system and doesn't cut off when stopping the engine with the stop/start. I personally do not like the start/stop function and disable it. If you do the same, this difference won't matter much. I don't believe stopping and starting the engine often is good for the turbo so I prefer to disable it. I'm willing to take the hit in fuel consumption for a longer lasting engine.
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Old Oct 7, 2024 | 10:49 PM
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Originally Posted by L1Wolf
I replied in the other thread first but I'll reply the same here.

I believe you are thinking of this post comparing the E350 and E450. I've driven both and put over 6K miles on the E350 and can confirm that the AC compressor does not operate when the engine cuts off when start/stop mode is on. If it's not off for very long or not very hot outside it's not that noticeable but if you have the AC on high because it's hot, its noticeable. The E450 drives the AC compressor off the electric system and doesn't cut off when stopping the engine with the stop/start. I personally do not like the start/stop function and disable it. If you do the same, this difference won't matter much. I don't believe stopping and starting the engine often is good for the turbo so I prefer to disable it. I'm willing to take the hit in fuel consumption for a longer lasting engine.
Just another point of view:


The auto stop/start is also there to reduce emissions and contaminants. As you probably know, many cities long ago banned the idling of diesel engines. No matter how clean you make an ICE, it still emits noxious fumes and CO2. Unnecessary idling is bad for our climate. While the amount of emissions per car may be small, taken together world wide, the emissions from unnecessary idling do add up. That is why I use the auto/stop feature on my E450.
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Old Oct 8, 2024 | 12:07 AM
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Originally Posted by JTK44
Just another point of view:


The auto stop/start is also there to reduce emissions and contaminants. As you probably know, many cities long ago banned the idling of diesel engines. No matter how clean you make an ICE, it still emits noxious fumes and CO2. Unnecessary idling is bad for our climate. While the amount of emissions per car may be small, taken together world wide, the emissions from unnecessary idling do add up. That is why I use the auto/stop feature on my E450.
Not a bad way to look at it and I'm not one to want to increase our pollutants unnecessarily, but I don't believe it would have a significant impact unless you were idling for a long time. I wonder if anyone did a study on how much it actually saves and if there are extra emissions right after startup that would diminish the benefit unless the engine stayed off for at least a specific amount of time. Then there is the extra carbon footprint of a premature engine failure and repair/replacement. If you really want to reduce your carbon footprint you would get an EV or ride a bicycle.

Last edited by L1Wolf; Oct 8, 2024 at 08:40 AM.
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Old Oct 8, 2024 | 06:55 AM
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Originally Posted by L1Wolf
. If you really want to reduce your carbon footprint you would get an EV or ride a bicycle.
Thanks. I never thought of that.
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Old Oct 8, 2024 | 12:24 PM
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I have not used start stop since my car stopped and failed to restart leaving me stuck in the middle of a busy intersection while attempting a left turn.
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