S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Thanks for the last noise fix, new noise now started somewhere else...

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Old Jan 23, 2014 | 01:08 AM
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s450 4matic
Thanks for the last noise fix, new noise now started somewhere else...

Thank you all for helping me fix the headrest noise problem last time with some fuzzy pipe cleaner thing,

this time i hear this noise from the vent, its like a whistle noise when i turn off the HVAC, no noise, when thats on there is a whistle noise like a loose fan or something, i wonder how i can get access to see if the fan….

one thing is that when i get outside the car i hear it too…. maybe it's a belt?
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Old Jan 24, 2014 | 05:16 PM
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CL55, S550, 450SL
You need to determine if it is actually the HVAC blower motor that is making the noise. Could be the bearings. While you are in the car, raise and lower both L and R fan speeds to see if it is coming from there. When was the last time you changed the cabin filters and are they in correctly??
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Old Jan 25, 2014 | 02:24 AM
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s450 4matic
you wouldn't believe it, it's cold and in canada has lots of salt, i went to wash the car today and after the car wash its nice and quiet again…. i wonder if some salt gotten into any of the pulleys belt in the engine compartment …

thanks
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