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2007 R350 A/C Noise

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Old Jun 3, 2011 | 04:05 PM
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2007R350guy
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2007 R350
2007 R350 A/C Noise
I've noticed when I turn on the A/C and start to accelerate, I hear a groaning fan like noise. As soon as I turn off the A/C button the noise stops. When the car was in factory warranty, the dealer ended up replacing the A/C unit and I still hear the noise. Could it be the fan? I assume that I would receive an error code if it was truly something. Thoughts?

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Last edited by 2007R350guy; Jun 3, 2011 at 04:11 PM. Reason: Typo
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Old Jun 10, 2011 | 09:32 AM
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2007R350guy
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2007 R350
I checked with my import shop and it sounds like the compressor staging the a/c unit.
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Old Jun 18, 2011 | 11:09 AM
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Benzo 003
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2008 ML350 4matic
My ML does the exact same thing....dealer said it was normal.
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