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CL-Class (W216) 2007-Present: CL 500, CL 600

Humming Noise?

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Old 10-12-2014, 10:15 PM
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CL600
Humming Noise?
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Last edited by stealth09; 01-05-2015 at 08:28 PM.
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Old 10-12-2014, 11:21 PM
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2007 CL550
Likely to be serpentine fan belt idler pulley. The original pulleys were known to become noisy with time. There was a replacement campaign a few years ago. Ask your local dealer if the campaign is still active and if your pulley can be replaced at no cost.
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Old 10-13-2014, 12:17 PM
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OK thanks. Are they hard to replace? I am pretty mechanically inclined, so I would attempt to do it on my own if the campaign isn't available.
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Old 10-13-2014, 12:52 PM
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Top up the power steering fluid. It may resolve your problem.
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Old 10-14-2014, 01:19 AM
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2007 CL550
Service Campaign 2008070002 AUG08 – 164, 164.8, 171, 203, 209, 211, 216, 219, 221, 230, and 251 Dealer will replace the existing V-belt upper guide pulley with one that is optimized for noise reduction (guide pulley – part #A272202101905). Approximately 192,941 vehicles affected.
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Old 10-14-2014, 07:39 PM
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Old 10-16-2014, 02:15 AM
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Old 10-30-2014, 11:48 AM
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