The HVAC blower motor may fail. This is commonly caused by water entry through the cabin air filter areas during heavy rain or snow. Failed blower motors should be replaced. Our technicians tell us there is no special fix for this issue at this time.
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2008 Mercedes r320, bought new, nothing but problems, Mercedes is nowhere close to what it used to be....the Japanese are the engineering leaders in the 20th Century...
dealer says it's over $700 to replace. i'm taking it to a local shop instead.