what exactly does "EC" (Economy) button do? - Mercedes-Benz Forum

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post #1 of 14 (permalink) Old 01-08-2007, 08:28 PM Thread Starter
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what exactly does "EC" (Economy) button do?

quick q, is the EC button the same as "AC" button in other cars? so during the wintertime, i can leave the EC on the whole time and it'd be ok right. i havent noticed any fuel economy differences with EC on however

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post #2 of 14 (permalink) Old 01-08-2007, 08:44 PM
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Hey, Pro.

Didn't you get the novel (aka owner's manual) with your car?

The EC button in most cases will preclude the air conditioning compressor from engaging, which will increase fuel economy depending on other conditions.

However, if you call for the compressor in other ways (such as engaging the button for the front window defrost) it will override the EC button and operate normally.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #3 of 14 (permalink) Old 01-08-2007, 09:21 PM
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EC is the stuff that doesn't need a compressor: heater and "vent" on other cars.
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post #4 of 14 (permalink) Old 01-09-2007, 12:41 PM
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Actually, the default is to always use the a/c compressor, as it provides dehumidification which helps with defrosting and defogging..

If you can do without that, you can optionally select EC and get a bit better economy by not using the compressor.

Kent Christensen
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post #5 of 14 (permalink) Old 01-09-2007, 01:00 PM
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Originally Posted by lkchris
Actually, the default is to always use the a/c compressor, as it provides dehumidification which helps with defrosting and defogging..

If you can do without that, you can optionally select EC and get a bit better economy by not using the compressor.
I don't know what the AC systems on other MB's are like but I've been told by a few car dealers that running the EC mode all the time can cause the whole AC system to degrade as tehy need running .
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post #6 of 14 (permalink) Old 01-09-2007, 01:35 PM
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Originally Posted by NZ Benz
I don't know what the AC systems on other MB's are like but I've been told by a few car dealers that running the EC mode all the time can cause the whole AC system to degrade as tehy need running .
Not sure if this is equally critical with modern AC systems, they have ceramic seals which do not start to leak equally easily as the older ones.

The older ones (at least) should be run frequently, some say once per month at least, some say more often. This keeps the seals in good condition.

The modern ones do not have an electrically controlled drive clutch but the compressor runs always. They use a different way to control the compressor functionality, some valves switch the circulation on and off, don't know the details.

I assume that this advice is still useful for all generations. Could be that it is not only the compressor seals that are happy when they get some exercise every now and then.

There is an interesting MB document about the AC systems on all current MB models.
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post #7 of 14 (permalink) Old 01-09-2007, 01:43 PM
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Originally Posted by ProV1x
quick q, is the EC button the same as "AC" button in other cars? so during the wintertime, i can leave the EC on the whole time and it'd be ok right. i havent noticed any fuel economy differences with EC on however
I believe EC is the same as the VENT button in lesser vehicles...

Don't believe everything you think
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post #8 of 14 (permalink) Old 01-09-2007, 08:58 PM
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Originally Posted by Diesel Benz
Not sure if this is equally critical with modern AC systems, they have ceramic seals which do not start to leak equally easily as the older ones.

The older ones (at least) should be run frequently, some say once per month at least, some say more often. This keeps the seals in good condition.

The modern ones do not have an electrically controlled drive clutch but the compressor runs always. They use a different way to control the compressor functionality, some valves switch the circulation on and off, don't know the details.

I assume that this advice is still useful for all generations. Could be that it is not only the compressor seals that are happy when they get some exercise every now and then.

There is an interesting MB document about the AC systems on all current MB models.
I just run mine all the time anyway that way I can set the temp I like for all year round regardless of whats going on outside.
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post #9 of 14 (permalink) Old 01-09-2007, 09:05 PM
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Originally Posted by NZ Benz
I just run mine all the time anyway that way I can set the temp I like for all year round regardless of whats going on outside.
Your vent or a/c? I leave my temp on all the time. The a/c compressor only runs when the temp is warm outside. I just never think about it 24/7, 365 days a year. It is just always very comfortable year round.

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post #10 of 14 (permalink) Old 01-09-2007, 10:46 PM
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Originally Posted by Jayhawk
Your vent or a/c? I leave my temp on all the time. The a/c compressor only runs when the temp is warm outside. I just never think about it 24/7, 365 days a year. It is just always very comfortable year round.
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