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Friends 1999 E430 engine rough with AC on

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Old Sep 26, 2010 | 09:16 PM
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JayGold's Avatar
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E430
Friends 1999 E430 engine rough with AC on

My friend has 1999 e430 with 115k miles on it. Well maintained and looks like new. When he drives with the ac on he says that the engine feels very rough and when we turn the car off we can hear a belt making a very loud noise for a few seconds after. I know the ac puts extra pressure on the engine but this seems excessive?
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Old Sep 26, 2010 | 10:42 PM
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
Have him

press the ec button on the climate control to fully turn it off(compressor)does that clear up the roughness?
If not check motor mounts for leakage they collapse and cause vibrations often felt like misfires.
diy on www.benzweorld.org w210 forum
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